C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;


	public class Program
	{
		public static  string username="Madam",password="Programming1",user,pass,select,loan,nloan,pangalan,d,namedebtor,loanuser,loanpass;
		public static string address,contact,settingspass;
		public static string fullnamess,contactss;
		public static double bankmax=1000000000,sloan,interest,fake,amounteds;
		public static int monthloan,re=0;
		public static  int[]opo=new int[10000000];
		
		public static  bool[]remover=new bool[10000000];
		public static  string[]alphabet={"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","-",",",".","/","="};
		
		
		public static  string[]ploan=new string[10000000];
		public  static string[]cloan=new String[10000000];
		public  static string[]aloan=new String[10000000];
		public  static string[]loanerusername=new String[10000000];
		public  static string[]loanerpass=new String[10000000];
		public static double [] [] jagged = new double[10000000][];
		
		public  static double[]amloan=new double[10000000];
		public  static double[]lsloan=new double[10000000];
		public  static double[]loanam=new double[10000000];
		public  static double[]mloan=new double[10000000];
		public  static double[]fakeloan=new double[10000000];
		public  static double[]deletors=new double[10000000];
		public  static double[]divide=new double[10000000];
		public  static double[]ihap=new double[10000000];
		public  static double[]balance=new double[10000000];
		public  static double[]amounted=new double[10000000];
		public  static double[]balanceds=new double[10000000];
		public static int z=1;
		
		
		
		public static void Main()
		{
			
			bool bank=true;
			
			
			Console.WriteLine("--------WELCOME TO BANKING SYSTEM--------");
			while(bank)
			{
			Console.WriteLine("[1]ADMIN\n[2]USER ");
			Console.Write("Please Select: ");
			select = Console.ReadLine();
			if(select.Equals("1"))
			{
				
			Console.Write("Enter Username: ");
			user = Console.ReadLine();
			Console.Write("Enter Password: ");
			pass = Console.ReadLine();
			
			if(user.Equals(username)&&pass.Equals(password))
			{ 
				
				Console.WriteLine("Successfuly Log-in!");
				z=1;
				Admin();
			}
			else if(z==3)
			{
				Console.WriteLine("You missed it 3 times.\nSystem will now shut down...");
				Console.ReadKey();
				bank=false;
				
				
				return;	
				
				
			}
			else 
			{
				
				Console.WriteLine("Invalid Username/Password!");
				z++;
				bank=true;
				
			}
					}	
			else if(select.Equals("2"))
			{
				Login();
			}
			else
			{
				Console.WriteLine("Invalid Input!!!!.....");
			}
			
		}
		}
		public static void Admin()
		{			
				Console.WriteLine("[1]New debtor\n[2]List of debtor\n[3]Payment\n[4]Settings\n[5]Check bankmoney\n[B]Back to main menu");
				Console.Write("Please Select: ");
				loan = Console.ReadLine();
				if(loan.Equals("1"))
				{
					NewLoaner();
					
					
				}
				else if (loan.Equals("2"))
				{
					LoanerList();
				}
				else if (loan.Equals("3"))
				{
					Payment();
				}
				else if (loan.Equals("4"))
				{
					Setting();
				}
				else if (loan.Equals("5"))
				{
					Bankmoney();
				}
				
				else if (loan.Equals("B")||loan.Equals("b"))
				{
					Main();
				}
				else
				{
					Console.WriteLine("Invalid Input!\nPlease select:");
					Admin();
				}
				
		}
		

		public static void NewLoaner()
			{
			int tttt=0;
			bool giggle=false;
			    bool balik;
			    bool unf;
			    bool unf1;
			    bool unf2;
			    bool unf3;
			    bool am;
			for(int a = 0; a < ploan.Length;a++ )
			{
				 
				if(ploan[a]==null&&cloan[a]==null&&aloan[a]==null&&lsloan[a]==0&&mloan[a]==0&&amloan[a]==0&&loanam[a]==0&&fakeloan[a]==0&&divide[a]==0&&ihap[a]==0&&balance[a]==0&&amounted[a]==0)
				{
					do{
						 Console.Write("Enter fullname of debtor: ");
				  pangalan = Console.ReadLine();
						for(int v=0;v<ploan.Length;v++)
						{ 
				  if(pangalan.Equals(ploan[v],StringComparison.OrdinalIgnoreCase))
				  {
				  	tttt=v;
				  	Console.WriteLine("Fullname already exist please contact the debtor right now or enter another fullname.");
				  	break;
				  }
						}
					}while(pangalan.Equals(ploan[tttt],StringComparison.OrdinalIgnoreCase));
					
			      ploan[a]=pangalan;
			      balik=true;
			      while(balik)
			      {
			      	do{
				  Console.Write("Enter contact number of debtor: ");
				  contact = Console.ReadLine();
				  for(int o=0;o<alphabet.Length;o++)
				  {
				  	if(contact.Contains(alphabet[o]))
				  	{
				  		re=o;
				  		Console.WriteLine("Invalid input....Please do not include letters!");
				  		break;
				  		
				  	}
				  	  
				  }			
			      	}while(contact.Contains(alphabet[re]));
			      	
				  if(contact.StartsWith("09"))
				  {
				      if(contact.Length==11)
				      {
				      cloan[a]=contact;
				      Console.Write("Enter address of debtor: ");
				     address = Console.ReadLine();
				     aloan[a]=address;
				     unf3=true;
				     while(unf3)
				     {
				      Console.Write("Enter salary of debtor (per month): ");
				     loanam[0] = double.Parse(Console.ReadLine());
				     
				     lsloan[a]=loanam[0];
				     
				     if(loanam[0]>=20000)
				     {
				     am=true;
				     while(am)
				     {
				     Console.Write("Enter months to pay: ");
				     monthloan =int.Parse( Console.ReadLine());
				     mloan[a]=monthloan;
				     
				    
				     if(monthloan>=12&&monthloan<=60)
				     {
				     if(loanam[0]>=20000&&loanam[0]<=50000)
				     {
				     	Console.WriteLine("You can loan 50,000-300,000");
				     	  unf=true;
				     	 while(unf)
				     {
				     Console.Write("Enter loan amount: ");
				     loanam[1] = double.Parse(Console.ReadLine());
				     amloan[a]=loanam[1];
				     remover[a]=false;
				     deletors[a]=amloan[a];
				     if(loanam[1]>=50000&&loanam[1]<=300000)
				     {
				     	bankmax-=loanam[1];
				      	if(bankmax<100000)
				      	{
				      		Console.WriteLine("You cannot loan because bank money is below 1000000.BANKRUP!!!");
				      		Console.WriteLine("\nSystem shut down....");
				      		Console.ReadKey();
				      		return;
				      	}
				      	else
				      	{
				      		bool pt=true;
				      		fake=amloan[a];
				      		interest=amloan[a]*0.05*mloan[a]/12;
				      		fakeloan[a]=fake+interest;
				      		divide[a]=fakeloan[a]/mloan[a];
				      		balance[a]=fakeloan[a];
				      		ihap[a]=mloan[a];
				      		Console.WriteLine("By the end of {0} months the future value will be {1}.",mloan[a],fakeloan[a]);
				      		Console.WriteLine("Successfully loaned {0}.",loanam[1]);
				      		do {
				      		Console.Write("Enter username for debtors account: ");
				      		loanuser = Console.ReadLine();
				      		if(loanuser.Length<4)
				      		{
				      			Console.WriteLine("Username's length must be 4 letters up!");
				      		}
				      		}while(loanuser.Length<4);
				      			
				      		loanerusername[a]=loanuser;
				      		while(pt==true)
				      		{
				      			
				      		do{
				      		Console.Write("Enter password for debtors account: ");
				      	    loanpass = Console.ReadLine();
				      	    if(loanpass.Length<4)
				      		{
				      			Console.WriteLine("Password's length must be 4 letters up!");
				      		}
				      			}while(loanpass.Length<4);
				      			
				      	    for(int m=0;m<ploan.Length;m++)
				      	    {
				      	    	if(loanpass.Equals(loanerpass[m],StringComparison.OrdinalIgnoreCase))
				      	    	{
				      	    		Console.WriteLine("Password is similar to other.Please chose another password....");
				      	    		
				      	    		pt=true;
				      	    		
				      	    		
				      	    		break;
				      	    	}
				      	    	else if(m<ploan.Length)
				      	    	{
				      	    		  loanerpass[a]=loanpass;
				      		Console.WriteLine("Successfully registered!\n\nPress any key to continue......");
				      		Console.ReadKey();
				     	Admin();	
				      	    	}
				      	    	else
				      	    	{
				      	    		continue;
				      	    	}
				      	    	
				      	    }
				      	  
				      		}
				      	   		      
				      	}
				     	
				     }
				    
				      else
				     {
				      	
				      	Console.WriteLine("Sorry salary and loan did not match.Try again!");
				     	unf=true;
				     }
				     	
				     }
				     }
   
				     else if(loanam[0]>50000&&loanam[0]<=200000)
				     {
				     	Console.WriteLine("You can loan 500,000-1,500,000");
				     	  unf1=true;
				     	 while(unf1)
				     {
				     Console.Write("Enter loan amount: ");
				     loanam[2] = double.Parse(Console.ReadLine());
				     amloan[a]=loanam[2];
				     deletors[a]=amloan[a];
				     if(loanam[2]>=500000&&loanam[2]<=1500000)
				     {
				     	bankmax-=loanam[2];
				      	if(bankmax<100000)
				      	{
				      		Console.WriteLine("You cannot loan because bank money is below 1,000,000.");
				      		Console.WriteLine("\n\nPress any key to continue......");
				      		Console.ReadKey();
				      		Main();
				      	}
				      	else
				      	{
				      		bool pt1=true;
				      		fake=amloan[a];
				      		interest=amloan[a]*0.05*mloan[a]/12;
				      		fakeloan[a]=fake+interest;
				      		divide[a]=fakeloan[a]/mloan[a];
				      		ihap[a]=mloan[a];
				      		balance[a]=fakeloan[a];
				      		Console.WriteLine("By the end of {0} months the future value will be {1}.",mloan[a],fakeloan[a]);
				      		Console.WriteLine("Successfully loaned {0}.",loanam[2]);
				      		
				      		do {
				      		Console.Write("Enter username for debtors account: ");
				      		loanuser = Console.ReadLine();
				      		if(loanuser.Length<4)
				      		{
				      			Console.WriteLine("Username's length must be 4 letters up!");
				      		}
				      		}while(loanuser.Length<4);
				      		loanerusername[a]=loanuser;
				      		
				      		while(pt1==true)
				      		{
				      			
				      		do{
				      		Console.Write("Enter password for debtors account: ");
				      	    loanpass = Console.ReadLine();
				      	    if(loanpass.Length<4)
				      		{
				      			Console.WriteLine("Password's length must be 4 letters up!");
				      		}
				      			}while(loanpass.Length<4);
				      			
				      	    for(int m=0;m<ploan.Length;m++)
				      	    {
				      	    	if(loanpass.Equals(loanerpass[m],StringComparison.OrdinalIgnoreCase))
				      	    	{
				      	    		Console.WriteLine("Password is similar to other.Please chose another password....");
				      	    		
				      	    		pt1=true;
				      	    		
				      	    		
				      	    		break;
				      	    	}
				      	    	else if(m<ploan.Length)
				      	    	{
				      	    		  loanerpass[a]=loanpass;
				      		Console.WriteLine("Successfully registered!\n\nPress any key to continue......");
				      		Console.ReadKey();
				     	Admin();	
				      	    	}
				      	    	else
				      	    	{
				      	    		continue;
				      	    	}
				      	    	
				      	    }
				      	  
				      		}
				      	}
				      	
				     	
				     }
				      else
				     {
				      	Console.WriteLine("Sorry salary and loan did not match.Try again!");
				     	unf1=true;
				     }	
				      
				     }
				     }
				     
				     else if (loanam[0]>200000)
				     {
				     	Console.WriteLine("You can loan 1,500,000-5,000,000");
				     	  unf2=true;
				     	 while(unf2)
				     {
				     Console.Write("Enter loan amount: ");
				     loanam[3] = double.Parse(Console.ReadLine());
				     amloan[a]=loanam[3];
				     deletors[a]=amloan[a];
				     if(loanam[3]>=1500000&&loanam[3]<=5000000)
				     {
				     	bankmax-=loanam[3];
				      	if(bankmax<100000)
				      	{
				      		Console.WriteLine("You cannot loan because bank money is below 1,000,000.");
				      		Console.WriteLine("\n\nPress any key to continue......");
				      		Console.ReadKey();
				      		Main();
				      	}
				      	else
				      	{
				      		bool pt2=true;
				      		fake=amloan[a];
				      		interest=amloan[a]*0.05*mloan[a]/12;
				      		fakeloan[a]=fake+interest;
				      		divide[a]=fakeloan[a]/mloan[a];
				      		ihap[a]=mloan[a];
				      		balance[a]=fakeloan[a];
				      		Console.WriteLine("By the end of {0} months the future value will be {1}.",mloan[a],fakeloan[a]);
				      		Console.WriteLine("Successfully loaned {0}.",loanam[3]);
				      		do {
				      		Console.Write("Enter username for debtors account: ");
				      		loanuser = Console.ReadLine();
				      		if(loanuser.Length<4)
				      		{
				      			Console.WriteLine("Username's length must be 4 letters up!");
				      		}
				      		}while(loanuser.Length<4);
				      		loanerusername[a]=loanuser;
				      		while(pt2==true)
				      		{
				      			do{
				      		Console.Write("Enter password for debtors account: ");
				      	    loanpass = Console.ReadLine();
				      	    if(loanpass.Length<4)
				      		{
				      			Console.WriteLine("Password's length must be 4 letters up!");
				      		}
				      			}while(loanpass.Length<4);
				      	    for(int m=0;m<ploan.Length;m++)
				      	    {
				      	    	if(loanpass.Equals(loanerpass[m],StringComparison.OrdinalIgnoreCase))
				      	    	{
				      	    		Console.WriteLine("Password is similar to other.Please chose another password....");
				      	    		
				      	    		pt2=true;
				      	    		
				      	    		
				      	    		break;
				      	    	}
				      	    	else if(m<ploan.Length)
				      	    	{
				      	    		  loanerpass[a]=loanpass;
				      		Console.WriteLine("Successfully registered!\n\nPress any key to continue......");
				      		Console.ReadKey();
				     	Admin();	
				      	    	}
				      	    	else
				      	    	{
				      	    		continue;
				      	    	}
				      	    	
				      	    }
				      	  
				      		}
				      	}
				     	
				     }
				     else if(loanam[3]>5000000)
				     {
				     	Console.WriteLine("Highest loan must be 5000000");
				     	unf2=true;
				     }
				 
				      else
				     {
				      	
				      	Console.WriteLine("Sorry salary and loan did not match.Try again!");
				     	unf2=true;
				     }	
				     }
				     }
				    
				     }
				     else
				     {
				     	Console.WriteLine("Months to pay must be 12 months above 60 months below.");
				     	am=true;
				     }
				   
				     }
				   
				     }
				     else
				     {
				     		Console.WriteLine("Invalid salary amount minimum is 20,000!.Please try again!");
				     		unf=false;
				     		unf1=false;
				     		unf2=false;
				     		am=false;
				     		unf3=true;
				     		
				     }
				   
				     }
				     }  else
				      {
				           Console.WriteLine("Contact number must be 11 digits. ");
				           balik=true;
				      }
				      
				      
				     }   else
				  {
				       Console.WriteLine("Contact number must starts with 09.");
				       balik=true;
				  }
				  
				     
				    
				     
			      }
				
				  
				}
			      
				else
				{
				continue;	
				}
				  
				}
			}
		public static void LoanerList()
		{
			int yy=0;
			bool balik =true;
			while(balik)
			{
			for(int b=0; b < ploan.Length;b++)
			{
				if(ploan[b]!=null)
				{	
					yy++;
					Console.WriteLine("\nDebtor:{0}\nName: {1}\nContact Number: {2}\nAddress: {3}\nMonthly Salary: {4}\nLoan amount: {5}\nMonth to pay: {6}\nRemaining balance: {7}\nUsername: {8}\nPassword: {9}\n",yy,ploan[b],cloan[b],aloan[b],lsloan[b],fakeloan[b],mloan[b],balance[b],loanerusername[b],loanerpass[b]);
					
				}
				else
				{
					continue;
				}
			}
			Console.WriteLine("Press any key back to menu or D if you want to delete data.");
			d = Console.ReadLine();
			if(d.Equals("D",StringComparison.OrdinalIgnoreCase))
			{
				Console.Write("Enter fullname of debtor: ");
					namedebtor = Console.ReadLine();
				for(int c=0;c < ploan.Length;c++)
				{
					if(namedebtor.Equals(ploan[c],StringComparison.OrdinalIgnoreCase))
					{
						Console.WriteLine("Are you sure do you want to delete {0} from the data?\nPress Y if yes any key back to menu...",ploan[c]);						
						string want = Console.ReadLine();
						if(want.Equals("Y",StringComparison.OrdinalIgnoreCase))
						{
							
							if(remover[c]==false)
							{
						bankmax+=deletors[c];
						yy=yy-1;
						divide[c]=0;
						ihap[c]=0;
						balance[c]=0;
						deletors[c]=0;
						loanerusername[c]=null;
						loanerpass[c]=null;
						ploan[c]=null;
						cloan[c]=null;
						aloan[c]=null;
						lsloan[c]=0;
						fakeloan[c]=0;
						mloan[c]=0;
						Console.WriteLine("Successfully deleted {0}",namedebtor);
						Console.WriteLine("\n\nPress any key to continue......");
				      	Console.ReadKey();
				     	Admin();
							} 
							
							
							else 
							{
								
						Console.WriteLine("Sorry you cannot delete {0} data because it started its payment.You can delete the data if the debtor paid its corresponding fees..",namedebtor);
						Console.WriteLine("\n\nPress any key to continue......");
				      	Console.ReadKey();
				     	Admin();	
							}
						}
						else
						{
							Admin();
						}
					}
					else if(c==ploan.Length-1)
					{
						Console.WriteLine("Invalid Input!.Name of debtor not found.");
					}
					else
					{
						continue;
					}
					
				}
			}
			else
			{
				Admin();
			}
			}
		}
		public static double[] pilapila=new double[10000000];
		
		public static void Payment()
		{
			double totalic;
			
			Console.Write("Enter the fullname of debtor: ");
			string palautang = Console.ReadLine();
			for(int d=0;d < ploan.Length;d++)
			{
				
				if(palautang.Equals(ploan[d],StringComparison.OrdinalIgnoreCase))
				{
					
					Console.WriteLine("Remaining balance is: {0}.",balance[d]);
					Console.WriteLine("Monthly payment is: {0}.",divide[d]);
					Console.WriteLine("Months to pay is: {0} months.",mloan[d]);
					Console.WriteLine("Remaining months to pay is: {0} months.",ihap[d]);
					do
					{
					Console.Write("Enter the amount of payment: ");
					amounteds = double.Parse(Console.ReadLine());		
					if(amounteds<divide[d]&&balanceds[d]>divide[d])
					 {
					 	Console.WriteLine("Invalid amount....Plss pay the corresponding payment");
					 }	
					}while(amounteds<divide[d]&&balance[d]>divide[d]);
					
					totalic=amounteds-balance[d];
					balanceds[d]=balance[d];
					balance[d]-=amounteds;
					pilapila[d]+=amounteds;
					
					remover[d]=true;
					
					if(balance[d]>0)
					{
						
						
						bankmax+=amounteds;
						
						ihap[d]--;
						
					
							Console.WriteLine("Successfully paid {0}.",amounteds);
					Console.WriteLine("Reamaining balance is {0}.",balance[d]);
					Console.WriteLine("\n\nPress any key back to menu.....");
					Console.ReadKey();
					Admin();
						
						
					}
					else if(balance[d]<divide[d]&&amounteds>=balance[d])
					{
						bankmax+=balanceds[d];
						Console.WriteLine("Successfully paid loan amount");
						Console.WriteLine("Your change is {0}",totalic);
						loanerusername[d]=null;
						loanerpass[d]=null;
						divide[d]=0;
						ihap[d]=0;
						deletors[d]=0;
						balance[d]=0;
						ploan[d]=null;
						cloan[d]=null;
						aloan[d]=null;
						lsloan[d]=0;
						fakeloan[d]=0;
						mloan[d]=0;
					Console.WriteLine("\n\n\nPress any key back to menu.....");
					Console.ReadKey();
						Admin();
					}
					
					else
					{
						
						
						bankmax+=balanceds[d];
						Console.WriteLine("Successfully paid loan amount");
						Console.WriteLine("Your change is {0}",totalic);
						loanerusername[d]=null;
						loanerpass[d]=null;
						divide[d]=0;
						ihap[d]=0;
						deletors[d]=0;
						balance[d]=0;
						ploan[d]=null;
						cloan[d]=null;
						aloan[d]=null;
						lsloan[d]=0;
						fakeloan[d]=0;
						mloan[d]=0;
					Console.WriteLine("\n\n\nPress any key back to menu.....");
					Console.ReadKey();
						Admin();
					}
				}
				else if(d==ploan.Length-1)
				{
					Console.WriteLine("Invalid Input.Name of debtor not found.\n\nPress any key back to main menu....");
					Console.ReadKey();
					Admin();
					
				}
				else
				{
					continue;
				}
			
			}
		}
		
		public static void Setting()
		{
			string newusername;
			string newpassword;
				Console.WriteLine("[1]Change username\n[2]Change password\nElse back to menu.");
				Console.Write("Select: ");
				string selections = Console.ReadLine();
				if(selections=="1")
				{
				 Console.Write("Enter current username: ");
			     string settingsuser = Console.ReadLine();
			     if(settingsuser.Equals(username))
			     {
			     	do{
			     	Console.Write("Enter new username: ");
			     	 newusername = Console.ReadLine();
			     	 if(newusername.Length<4)
			     	 {
			     	 	Console.WriteLine("Characters must be 4 above!");
			     	 }
			     	}while(newusername.Length<4);
			     	Console.WriteLine("Successfully change username from {0} to {1}",username,newusername);
			     		username=newusername;
			     		Console.WriteLine("\n\nPress any key back to menu.....");
			     		Console.ReadKey();
			     			Admin();
			     }
			     else
			     {
			     		Console.WriteLine("Invalid username!!!");
			      	Console.WriteLine("\n\nPress any key back to menu.....");
			     		Console.ReadKey();
			     			Admin();
			     }
				}
				else if(selections=="2")
				{
			    Console.Write("Enter current passowrd: ");
			     settingspass = Console.ReadLine();
			      if(settingspass.Equals(password))
			     {
			     	do{
			     	Console.Write("Enter new username: ");
			     	 newpassword = Console.ReadLine();
			     	 if(newpassword.Length<4)
			     	 {
			     	 	Console.WriteLine("Characters must be 4 above!");
			     	 }
			     	}while(newpassword.Length<4);
			     	
			     	Console.WriteLine("Successfully change password from {0} to {1}",password,newpassword);
			     		password=newpassword;
			     		Console.WriteLine("\n\nPress any key back to menu.....");
			     		Console.ReadKey();
			     			Admin();
			     }
			      else
			      {
			      	Console.WriteLine("Invalid Password!!!");
			      	Console.WriteLine("\n\nPress any key back to menu.....");
			     		Console.ReadKey();
			     			Admin();
			      }
				}
				else
				{
					Admin();
				}
		}
		public static void Bankmoney()
		{
			Console.WriteLine("Bank money is {0}",bankmax);
			Console.WriteLine("\n\nPress any key back to menu.....");
			 Console.ReadKey();
			  Admin();
		}
		public static void User()
		{
			bool balik=true;
			while(balik)
			{
			Console.Write("[1]Check balance\n[2]Payment history\n[3]Change Password\n[B]Back to main menu");
			Console.Write("Select: ");
			string selectss = Console.ReadLine();
			if(selectss=="1")
			{
				Checkbalance();
			}
			else if(selectss=="2")
			{
				Paymenthistory();
			}
			else if(selectss=="3")
			{
				ChangePassword();
			}
			else if(selectss.Equals("b",StringComparison.OrdinalIgnoreCase))
			{
				Main();
			}
			else
			{
				Console.WriteLine("Invalid input!");
				balik=true;
			}
			}
		}
		public static void Login()
		{
			bool balik=true;
			while(balik)
			{
				
			Console.Write("Enter your username: ");
			fullnamess = Console.ReadLine();
			Console.Write("Enter your password: ");
			contactss = Console.ReadLine();
			for(int e=0;e<ploan.Length;e++)
			{
		     if(fullnamess.Equals(loanerusername[e],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[e],StringComparison.OrdinalIgnoreCase))
		    {
		     	Console.WriteLine("\n\nSuccessfully Log-in!");
		     	User();
			}
		     else if(e==ploan.Length-1)
			{
		     	Console.WriteLine("Invalid username/password...\n\nPress any key to continue....");
		     	Main();
			}
		     else
		     {
		     	continue;
		     }
			}
			
			}
		}
		public static void Checkbalance()
		{
			
			for(int f=0;f < ploan.Length;f++)
			{
				if(fullnamess.Equals(loanerusername[f],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[f],StringComparison.OrdinalIgnoreCase))
				{
					Console.WriteLine("Remaining balance is: {0}.",balance[f]);
					Console.WriteLine("Monthly payment is: {0}.",divide[f]);
					Console.WriteLine("Months to pay is: {0} months.",mloan[f]);
					Console.WriteLine("Remaining months to pay is: {0}.",ihap[f]);
					Console.WriteLine("\n\n\nPress any key to continue....");
					Console.ReadKey();
					User();
				}
				else if(f==ploan.Length-1)
				{
					Console.WriteLine("Fullname and contactnum not found.\n\n\nPress any key to continue....");
				   Console.ReadKey();
					User();
				}
				else
				{
					continue;
				}
			}
		}
		public static void Paymenthistory()
		{
			
				for(int g=0;g < ploan.Length;g++)
			{
				if(fullnamess.Equals(loanerusername[g],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[g],StringComparison.OrdinalIgnoreCase))
				{
			
				
						Console.WriteLine("Total Payment is PhP: {0}",pilapila[g]); 				
				}
				else if(g==ploan.Length-1)
				{
					Console.WriteLine("\n\n\nPress any key to continue....");
					Console.ReadKey();
					User();
				}
				else
				{
					continue;
				}
		}
	}
		public static void ChangePassword()
		{
			string newpasswordsss;
			for(int h=0;h < ploan.Length;h++)
		{
		if(fullnamess.Equals(loanerusername[h],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[h],StringComparison.OrdinalIgnoreCase))
		{
			Console.WriteLine("Enter current password: ");
			string currentpassword = Console.ReadLine();
			for(int i=0;i<ploan.Length;i++)
			{
				if(currentpassword.Equals(loanerpass[i],StringComparison.OrdinalIgnoreCase))
				{
					
					do{
					Console.Write("Enter new password: ");
					newpasswordsss = Console.ReadLine();
					if(newpasswordsss.Length<4)
					{
						Console.WriteLine("Password must be 4 letters up!");
					}
					}while(newpasswordsss.Length<4);
					loanerpass[i]=newpasswordsss;
					Console.Write("Successfully change password!\n\n\n");
					Console.WriteLine("\n\n\nPress any key to continue....");
					Console.ReadKey();
					User();
					
				}
				else if(i<ploan.Length)
				{
					Console.WriteLine("Invalid Password!");
					Console.WriteLine("\n\n\nPress any key to continue....");
					Console.ReadKey();
					User();
				}
				else
				{
					continue;
				}
			}
		}
		}
		}
	}

​x
 
using System;
​
​
    public class Program
    {
        public static  string username="Madam",password="Programming1",user,pass,select,loan,nloan,pangalan,d,namedebtor,loanuser,loanpass;
        public static string address,contact,settingspass;
        public static string fullnamess,contactss;
        public static double bankmax=1000000000,sloan,interest,fake,amounteds;
        public static int monthloan,re=0;
        public static  int[]opo=new int[10000000];
        
        public static  bool[]remover=new bool[10000000];
        public static  string[]alphabet={"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","-",",",".","/","="};
        
        
        public static  string[]ploan=new string[10000000];
        public  static string[]cloan=new String[10000000];
        public  static string[]aloan=new String[10000000];
        public  static string[]loanerusername=new String[10000000];
        public  static string[]loanerpass=new String[10000000];
        public static double [] [] jagged = new double[10000000][];
        
        public  static double[]amloan=new double[10000000];
        public  static double[]lsloan=new double[10000000];
        public  static double[]loanam=new double[10000000];
        public  static double[]mloan=new double[10000000];
        public  static double[]fakeloan=new double[10000000];
        public  static double[]deletors=new double[10000000];
        public  static double[]divide=new double[10000000];
        public  static double[]ihap=new double[10000000];
        public  static double[]balance=new double[10000000];
        public  static double[]amounted=new double[10000000];
        public  static double[]balanceds=new double[10000000];
        public static int z=1;
        
        
        
        public static void Main()
        {
            
            bool bank=true;
            
            
            Console.WriteLine("--------WELCOME TO BANKING SYSTEM--------");
            while(bank)
            {
            Console.WriteLine("[1]ADMIN\n[2]USER ");
            Console.Write("Please Select: ");
            select = Console.ReadLine();
            if(select.Equals("1"))
            {
                
            Console.Write("Enter Username: ");
            user = Console.ReadLine();
            Console.Write("Enter Password: ");
            pass = Console.ReadLine();
            
            if(user.Equals(username)&&pass.Equals(password))
            { 
                
                Console.WriteLine("Successfuly Log-in!");
                z=1;
                Admin();
            }
            else if(z==3)
            {
                Console.WriteLine("You missed it 3 times.\nSystem will now shut down...");
                Console.ReadKey();
                bank=false;
                
                
                return; 
                
                
            }
            else 
            {
                
                Console.WriteLine("Invalid Username/Password!");
                z++;
                bank=true;
                
            }
                    }   
            else if(select.Equals("2"))
            {
                Login();
            }
            else
            {
                Console.WriteLine("Invalid Input!!!!.....");
            }
            
        }
        }
        public static void Admin()
        {           
                Console.WriteLine("[1]New debtor\n[2]List of debtor\n[3]Payment\n[4]Settings\n[5]Check bankmoney\n[B]Back to main menu");
                Console.Write("Please Select: ");
                loan = Console.ReadLine();
                if(loan.Equals("1"))
                {
                    NewLoaner();
                    
                    
                }
                else if (loan.Equals("2"))
                {
                    LoanerList();
                }
                else if (loan.Equals("3"))
                {
                    Payment();
                }
                else if (loan.Equals("4"))
                {
                    Setting();
                }
                else if (loan.Equals("5"))
                {
                    Bankmoney();
                }
                
                else if (loan.Equals("B")||loan.Equals("b"))
                {
                    Main();
                }
                else
                {
                    Console.WriteLine("Invalid Input!\nPlease select:");
                    Admin();
                }
                
        }
        
​
        public static void NewLoaner()
            {
            int tttt=0;
            bool giggle=false;
                bool balik;
                bool unf;
                bool unf1;
                bool unf2;
                bool unf3;
                bool am;
            for(int a = 0; a < ploan.Length;a++ )
            {
                 
                if(ploan[a]==null&&cloan[a]==null&&aloan[a]==null&&lsloan[a]==0&&mloan[a]==0&&amloan[a]==0&&loanam[a]==0&&fakeloan[a]==0&&divide[a]==0&&ihap[a]==0&&balance[a]==0&&amounted[a]==0)
                {
                    do{
                         Console.Write("Enter fullname of debtor: ");
                  pangalan = Console.ReadLine();
                        for(int v=0;v<ploan.Length;v++)
                        { 
                  if(pangalan.Equals(ploan[v],StringComparison.OrdinalIgnoreCase))
                  {
                    tttt=v;
                    Console.WriteLine("Fullname already exist please contact the debtor right now or enter another fullname.");
                    break;
                  }
                        }
                    }while(pangalan.Equals(ploan[tttt],StringComparison.OrdinalIgnoreCase));
                    
                  ploan[a]=pangalan;
                  balik=true;
                  while(balik)
                  {
                    do{
                  Console.Write("Enter contact number of debtor: ");
                  contact = Console.ReadLine();
                  for(int o=0;o<alphabet.Length;o++)
                  {
                    if(contact.Contains(alphabet[o]))
                    {
                        re=o;
                        Console.WriteLine("Invalid input....Please do not include letters!");
                        break;
                        
                    }
                      
                  }         
                    }while(contact.Contains(alphabet[re]));
                    
                  if(contact.StartsWith("09"))
                  {
                      if(contact.Length==11)
                      {
                      cloan[a]=contact;
                      Console.Write("Enter address of debtor: ");
                     address = Console.ReadLine();
                     aloan[a]=address;
                     unf3=true;
                     while(unf3)
                     {
                      Console.Write("Enter salary of debtor (per month): ");
                     loanam[0] = double.Parse(Console.ReadLine());
                     
                     lsloan[a]=loanam[0];
                     
                     if(loanam[0]>=20000)
                     {
                     am=true;
                     while(am)
                     {
                     Console.Write("Enter months to pay: ");
                     monthloan =int.Parse( Console.ReadLine());
                     mloan[a]=monthloan;
                     
                    
                     if(monthloan>=12&&monthloan<=60)
                     {
                     if(loanam[0]>=20000&&loanam[0]<=50000)
                     {
                        Console.WriteLine("You can loan 50,000-300,000");
                          unf=true;
                         while(unf)
                     {
                     Console.Write("Enter loan amount: ");
                     loanam[1] = double.Parse(Console.ReadLine());
                     amloan[a]=loanam[1];
                     remover[a]=false;
                     deletors[a]=amloan[a];
                     if(loanam[1]>=50000&&loanam[1]<=300000)
                     {
                        bankmax-=loanam[1];
                        if(bankmax<100000)
                        {
                            Console.WriteLine("You cannot loan because bank money is below 1000000.BANKRUP!!!");
                            Console.WriteLine("\nSystem shut down....");
                            Console.ReadKey();
                            return;
                        }
                        else
                        {
                            bool pt=true;
                            fake=amloan[a];
                            interest=amloan[a]*0.05*mloan[a]/12;
                            fakeloan[a]=fake+interest;
                            divide[a]=fakeloan[a]/mloan[a];
                            balance[a]=fakeloan[a];
                            ihap[a]=mloan[a];
                            Console.WriteLine("By the end of {0} months the future value will be {1}.",mloan[a],fakeloan[a]);
                            Console.WriteLine("Successfully loaned {0}.",loanam[1]);
                            do {
                            Console.Write("Enter username for debtors account: ");
                            loanuser = Console.ReadLine();
                            if(loanuser.Length<4)
                            {
                                Console.WriteLine("Username's length must be 4 letters up!");
                            }
                            }while(loanuser.Length<4);
                                
                            loanerusername[a]=loanuser;
                            while(pt==true)
                            {
                                
                            do{
                            Console.Write("Enter password for debtors account: ");
                            loanpass = Console.ReadLine();
                            if(loanpass.Length<4)
                            {
                                Console.WriteLine("Password's length must be 4 letters up!");
                            }
                                }while(loanpass.Length<4);
                                
                            for(int m=0;m<ploan.Length;m++)
                            {
                                if(loanpass.Equals(loanerpass[m],StringComparison.OrdinalIgnoreCase))
                                {
                                    Console.WriteLine("Password is similar to other.Please chose another password....");
                                    
                                    pt=true;
                                    
                                    
                                    break;
                                }
                                else if(m<ploan.Length)
                                {
                                      loanerpass[a]=loanpass;
                            Console.WriteLine("Successfully registered!\n\nPress any key to continue......");
                            Console.ReadKey();
                        Admin();    
                                }
                                else
                                {
                                    continue;
                                }
                                
                            }
                          
                            }
                                      
                        }
                        
                     }
                    
                      else
                     {
                        
                        Console.WriteLine("Sorry salary and loan did not match.Try again!");
                        unf=true;
                     }
                        
                     }
                     }
   
                     else if(loanam[0]>50000&&loanam[0]<=200000)
                     {
                        Console.WriteLine("You can loan 500,000-1,500,000");
                          unf1=true;
                         while(unf1)
                     {
                     Console.Write("Enter loan amount: ");
                     loanam[2] = double.Parse(Console.ReadLine());
                     amloan[a]=loanam[2];
                     deletors[a]=amloan[a];
                     if(loanam[2]>=500000&&loanam[2]<=1500000)
                     {
                        bankmax-=loanam[2];
                        if(bankmax<100000)
                        {
                            Console.WriteLine("You cannot loan because bank money is below 1,000,000.");
                            Console.WriteLine("\n\nPress any key to continue......");
                            Console.ReadKey();
                            Main();
                        }
                        else
                        {
                            bool pt1=true;
                            fake=amloan[a];
                            interest=amloan[a]*0.05*mloan[a]/12;
                            fakeloan[a]=fake+interest;
                            divide[a]=fakeloan[a]/mloan[a];
                            ihap[a]=mloan[a];
                            balance[a]=fakeloan[a];
                            Console.WriteLine("By the end of {0} months the future value will be {1}.",mloan[a],fakeloan[a]);
                            Console.WriteLine("Successfully loaned {0}.",loanam[2]);
                            
                            do {
                            Console.Write("Enter username for debtors account: ");
                            loanuser = Console.ReadLine();
                            if(loanuser.Length<4)
                            {
                                Console.WriteLine("Username's length must be 4 letters up!");
                            }
                            }while(loanuser.Length<4);
                            loanerusername[a]=loanuser;
                            
                            while(pt1==true)
                            {
                                
                            do{
                            Console.Write("Enter password for debtors account: ");
                            loanpass = Console.ReadLine();
                            if(loanpass.Length<4)
                            {
                                Console.WriteLine("Password's length must be 4 letters up!");
                            }
                                }while(loanpass.Length<4);
                                
                            for(int m=0;m<ploan.Length;m++)
                            {
                                if(loanpass.Equals(loanerpass[m],StringComparison.OrdinalIgnoreCase))
                                {
                                    Console.WriteLine("Password is similar to other.Please chose another password....");
                                    
                                    pt1=true;
                                    
                                    
                                    break;
                                }
                                else if(m<ploan.Length)
                                {
                                      loanerpass[a]=loanpass;
                            Console.WriteLine("Successfully registered!\n\nPress any key to continue......");
                            Console.ReadKey();
                        Admin();    
                                }
                                else
                                {
                                    continue;
                                }
                                
                            }
                          
                            }
                        }
                        
                        
                     }
                      else
                     {
                        Console.WriteLine("Sorry salary and loan did not match.Try again!");
                        unf1=true;
                     }  
                      
                     }
                     }
                     
                     else if (loanam[0]>200000)
                     {
                        Console.WriteLine("You can loan 1,500,000-5,000,000");
                          unf2=true;
                         while(unf2)
                     {
                     Console.Write("Enter loan amount: ");
                     loanam[3] = double.Parse(Console.ReadLine());
                     amloan[a]=loanam[3];
                     deletors[a]=amloan[a];
                     if(loanam[3]>=1500000&&loanam[3]<=5000000)
                     {
                        bankmax-=loanam[3];
                        if(bankmax<100000)
                        {
                            Console.WriteLine("You cannot loan because bank money is below 1,000,000.");
                            Console.WriteLine("\n\nPress any key to continue......");
                            Console.ReadKey();
                            Main();
                        }
                        else
                        {
                            bool pt2=true;
                            fake=amloan[a];
                            interest=amloan[a]*0.05*mloan[a]/12;
                            fakeloan[a]=fake+interest;
                            divide[a]=fakeloan[a]/mloan[a];
                            ihap[a]=mloan[a];
                            balance[a]=fakeloan[a];
                            Console.WriteLine("By the end of {0} months the future value will be {1}.",mloan[a],fakeloan[a]);
                            Console.WriteLine("Successfully loaned {0}.",loanam[3]);
                            do {
                            Console.Write("Enter username for debtors account: ");
                            loanuser = Console.ReadLine();
                            if(loanuser.Length<4)
                            {
                                Console.WriteLine("Username's length must be 4 letters up!");
                            }
                            }while(loanuser.Length<4);
                            loanerusername[a]=loanuser;
                            while(pt2==true)
                            {
                                do{
                            Console.Write("Enter password for debtors account: ");
                            loanpass = Console.ReadLine();
                            if(loanpass.Length<4)
                            {
                                Console.WriteLine("Password's length must be 4 letters up!");
                            }
                                }while(loanpass.Length<4);
                            for(int m=0;m<ploan.Length;m++)
                            {
                                if(loanpass.Equals(loanerpass[m],StringComparison.OrdinalIgnoreCase))
                                {
                                    Console.WriteLine("Password is similar to other.Please chose another password....");
                                    
                                    pt2=true;
                                    
                                    
                                    break;
                                }
                                else if(m<ploan.Length)
                                {
                                      loanerpass[a]=loanpass;
                            Console.WriteLine("Successfully registered!\n\nPress any key to continue......");
                            Console.ReadKey();
                        Admin();    
                                }
                                else
                                {
                                    continue;
                                }
                                
                            }
                          
                            }
                        }
                        
                     }
                     else if(loanam[3]>5000000)
                     {
                        Console.WriteLine("Highest loan must be 5000000");
                        unf2=true;
                     }
                 
                      else
                     {
                        
                        Console.WriteLine("Sorry salary and loan did not match.Try again!");
                        unf2=true;
                     }  
                     }
                     }
                    
                     }
                     else
                     {
                        Console.WriteLine("Months to pay must be 12 months above 60 months below.");
                        am=true;
                     }
                   
                     }
                   
                     }
                     else
                     {
                            Console.WriteLine("Invalid salary amount minimum is 20,000!.Please try again!");
                            unf=false;
                            unf1=false;
                            unf2=false;
                            am=false;
                            unf3=true;
                            
                     }
                   
                     }
                     }  else
                      {
                           Console.WriteLine("Contact number must be 11 digits. ");
                           balik=true;
                      }
                      
                      
                     }   else
                  {
                       Console.WriteLine("Contact number must starts with 09.");
                       balik=true;
                  }
                  
                     
                    
                     
                  }
                
                  
                }
                  
                else
                {
                continue;   
                }
                  
                }
            }
        public static void LoanerList()
        {
            int yy=0;
            bool balik =true;
            while(balik)
            {
            for(int b=0; b < ploan.Length;b++)
            {
                if(ploan[b]!=null)
                {   
                    yy++;
                    Console.WriteLine("\nDebtor:{0}\nName: {1}\nContact Number: {2}\nAddress: {3}\nMonthly Salary: {4}\nLoan amount: {5}\nMonth to pay: {6}\nRemaining balance: {7}\nUsername: {8}\nPassword: {9}\n",yy,ploan[b],cloan[b],aloan[b],lsloan[b],fakeloan[b],mloan[b],balance[b],loanerusername[b],loanerpass[b]);
                    
                }
                else
                {
                    continue;
                }
            }
            Console.WriteLine("Press any key back to menu or D if you want to delete data.");
            d = Console.ReadLine();
            if(d.Equals("D",StringComparison.OrdinalIgnoreCase))
            {
                Console.Write("Enter fullname of debtor: ");
                    namedebtor = Console.ReadLine();
                for(int c=0;c < ploan.Length;c++)
                {
                    if(namedebtor.Equals(ploan[c],StringComparison.OrdinalIgnoreCase))
                    {
                        Console.WriteLine("Are you sure do you want to delete {0} from the data?\nPress Y if yes any key back to menu...",ploan[c]);                        
                        string want = Console.ReadLine();
                        if(want.Equals("Y",StringComparison.OrdinalIgnoreCase))
                        {
                            
                            if(remover[c]==false)
                            {
                        bankmax+=deletors[c];
                        yy=yy-1;
                        divide[c]=0;
                        ihap[c]=0;
                        balance[c]=0;
                        deletors[c]=0;
                        loanerusername[c]=null;
                        loanerpass[c]=null;
                        ploan[c]=null;
                        cloan[c]=null;
                        aloan[c]=null;
                        lsloan[c]=0;
                        fakeloan[c]=0;
                        mloan[c]=0;
                        Console.WriteLine("Successfully deleted {0}",namedebtor);
                        Console.WriteLine("\n\nPress any key to continue......");
                        Console.ReadKey();
                        Admin();
                            } 
                            
                            
                            else 
                            {
                                
                        Console.WriteLine("Sorry you cannot delete {0} data because it started its payment.You can delete the data if the debtor paid its corresponding fees..",namedebtor);
                        Console.WriteLine("\n\nPress any key to continue......");
                        Console.ReadKey();
                        Admin();    
                            }
                        }
                        else
                        {
                            Admin();
                        }
                    }
                    else if(c==ploan.Length-1)
                    {
                        Console.WriteLine("Invalid Input!.Name of debtor not found.");
                    }
                    else
                    {
                        continue;
                    }
                    
                }
            }
            else
            {
                Admin();
            }
            }
        }
        public static double[] pilapila=new double[10000000];
        
        public static void Payment()
        {
            double totalic;
            
            Console.Write("Enter the fullname of debtor: ");
            string palautang = Console.ReadLine();
            for(int d=0;d < ploan.Length;d++)
            {
                
                if(palautang.Equals(ploan[d],StringComparison.OrdinalIgnoreCase))
                {
                    
                    Console.WriteLine("Remaining balance is: {0}.",balance[d]);
                    Console.WriteLine("Monthly payment is: {0}.",divide[d]);
                    Console.WriteLine("Months to pay is: {0} months.",mloan[d]);
                    Console.WriteLine("Remaining months to pay is: {0} months.",ihap[d]);
                    do
                    {
                    Console.Write("Enter the amount of payment: ");
                    amounteds = double.Parse(Console.ReadLine());       
                    if(amounteds<divide[d]&&balanceds[d]>divide[d])
                     {
                        Console.WriteLine("Invalid amount....Plss pay the corresponding payment");
                     }  
                    }while(amounteds<divide[d]&&balance[d]>divide[d]);
                    
                    totalic=amounteds-balance[d];
                    balanceds[d]=balance[d];
                    balance[d]-=amounteds;
                    pilapila[d]+=amounteds;
                    
                    remover[d]=true;
                    
                    if(balance[d]>0)
                    {
                        
                        
                        bankmax+=amounteds;
                        
                        ihap[d]--;
                        
                    
                            Console.WriteLine("Successfully paid {0}.",amounteds);
                    Console.WriteLine("Reamaining balance is {0}.",balance[d]);
                    Console.WriteLine("\n\nPress any key back to menu.....");
                    Console.ReadKey();
                    Admin();
                        
                        
                    }
                    else if(balance[d]<divide[d]&&amounteds>=balance[d])
                    {
                        bankmax+=balanceds[d];
                        Console.WriteLine("Successfully paid loan amount");
                        Console.WriteLine("Your change is {0}",totalic);
                        loanerusername[d]=null;
                        loanerpass[d]=null;
                        divide[d]=0;
                        ihap[d]=0;
                        deletors[d]=0;
                        balance[d]=0;
                        ploan[d]=null;
                        cloan[d]=null;
                        aloan[d]=null;
                        lsloan[d]=0;
                        fakeloan[d]=0;
                        mloan[d]=0;
                    Console.WriteLine("\n\n\nPress any key back to menu.....");
                    Console.ReadKey();
                        Admin();
                    }
                    
                    else
                    {
                        
                        
                        bankmax+=balanceds[d];
                        Console.WriteLine("Successfully paid loan amount");
                        Console.WriteLine("Your change is {0}",totalic);
                        loanerusername[d]=null;
                        loanerpass[d]=null;
                        divide[d]=0;
                        ihap[d]=0;
                        deletors[d]=0;
                        balance[d]=0;
                        ploan[d]=null;
                        cloan[d]=null;
                        aloan[d]=null;
                        lsloan[d]=0;
                        fakeloan[d]=0;
                        mloan[d]=0;
                    Console.WriteLine("\n\n\nPress any key back to menu.....");
                    Console.ReadKey();
                        Admin();
                    }
                }
                else if(d==ploan.Length-1)
                {
                    Console.WriteLine("Invalid Input.Name of debtor not found.\n\nPress any key back to main menu....");
                    Console.ReadKey();
                    Admin();
                    
                }
                else
                {
                    continue;
                }
            
            }
        }
        
        public static void Setting()
        {
            string newusername;
            string newpassword;
                Console.WriteLine("[1]Change username\n[2]Change password\nElse back to menu.");
                Console.Write("Select: ");
                string selections = Console.ReadLine();
                if(selections=="1")
                {
                 Console.Write("Enter current username: ");
                 string settingsuser = Console.ReadLine();
                 if(settingsuser.Equals(username))
                 {
                    do{
                    Console.Write("Enter new username: ");
                     newusername = Console.ReadLine();
                     if(newusername.Length<4)
                     {
                        Console.WriteLine("Characters must be 4 above!");
                     }
                    }while(newusername.Length<4);
                    Console.WriteLine("Successfully change username from {0} to {1}",username,newusername);
                        username=newusername;
                        Console.WriteLine("\n\nPress any key back to menu.....");
                        Console.ReadKey();
                            Admin();
                 }
                 else
                 {
                        Console.WriteLine("Invalid username!!!");
                    Console.WriteLine("\n\nPress any key back to menu.....");
                        Console.ReadKey();
                            Admin();
                 }
                }
                else if(selections=="2")
                {
                Console.Write("Enter current passowrd: ");
                 settingspass = Console.ReadLine();
                  if(settingspass.Equals(password))
                 {
                    do{
                    Console.Write("Enter new username: ");
                     newpassword = Console.ReadLine();
                     if(newpassword.Length<4)
                     {
                        Console.WriteLine("Characters must be 4 above!");
                     }
                    }while(newpassword.Length<4);
                    
                    Console.WriteLine("Successfully change password from {0} to {1}",password,newpassword);
                        password=newpassword;
                        Console.WriteLine("\n\nPress any key back to menu.....");
                        Console.ReadKey();
                            Admin();
                 }
                  else
                  {
                    Console.WriteLine("Invalid Password!!!");
                    Console.WriteLine("\n\nPress any key back to menu.....");
                        Console.ReadKey();
                            Admin();
                  }
                }
                else
                {
                    Admin();
                }
        }
        public static void Bankmoney()
        {
            Console.WriteLine("Bank money is {0}",bankmax);
            Console.WriteLine("\n\nPress any key back to menu.....");
             Console.ReadKey();
              Admin();
        }
        public static void User()
        {
            bool balik=true;
            while(balik)
            {
            Console.Write("[1]Check balance\n[2]Payment history\n[3]Change Password\n[B]Back to main menu");
            Console.Write("Select: ");
            string selectss = Console.ReadLine();
            if(selectss=="1")
            {
                Checkbalance();
            }
            else if(selectss=="2")
            {
                Paymenthistory();
            }
            else if(selectss=="3")
            {
                ChangePassword();
            }
            else if(selectss.Equals("b",StringComparison.OrdinalIgnoreCase))
            {
                Main();
            }
            else
            {
                Console.WriteLine("Invalid input!");
                balik=true;
            }
            }
        }
        public static void Login()
        {
            bool balik=true;
            while(balik)
            {
                
            Console.Write("Enter your username: ");
            fullnamess = Console.ReadLine();
            Console.Write("Enter your password: ");
            contactss = Console.ReadLine();
            for(int e=0;e<ploan.Length;e++)
            {
             if(fullnamess.Equals(loanerusername[e],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[e],StringComparison.OrdinalIgnoreCase))
            {
                Console.WriteLine("\n\nSuccessfully Log-in!");
                User();
            }
             else if(e==ploan.Length-1)
            {
                Console.WriteLine("Invalid username/password...\n\nPress any key to continue....");
                Main();
            }
             else
             {
                continue;
             }
            }
            
            }
        }
        public static void Checkbalance()
        {
            
            for(int f=0;f < ploan.Length;f++)
            {
                if(fullnamess.Equals(loanerusername[f],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[f],StringComparison.OrdinalIgnoreCase))
                {
                    Console.WriteLine("Remaining balance is: {0}.",balance[f]);
                    Console.WriteLine("Monthly payment is: {0}.",divide[f]);
                    Console.WriteLine("Months to pay is: {0} months.",mloan[f]);
                    Console.WriteLine("Remaining months to pay is: {0}.",ihap[f]);
                    Console.WriteLine("\n\n\nPress any key to continue....");
                    Console.ReadKey();
                    User();
                }
                else if(f==ploan.Length-1)
                {
                    Console.WriteLine("Fullname and contactnum not found.\n\n\nPress any key to continue....");
                   Console.ReadKey();
                    User();
                }
                else
                {
                    continue;
                }
            }
        }
        public static void Paymenthistory()
        {
            
                for(int g=0;g < ploan.Length;g++)
            {
                if(fullnamess.Equals(loanerusername[g],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[g],StringComparison.OrdinalIgnoreCase))
                {
            
                
                        Console.WriteLine("Total Payment is PhP: {0}",pilapila[g]);                 
                }
                else if(g==ploan.Length-1)
                {
                    Console.WriteLine("\n\n\nPress any key to continue....");
                    Console.ReadKey();
                    User();
                }
                else
                {
                    continue;
                }
        }
    }
        public static void ChangePassword()
        {
            string newpasswordsss;
            for(int h=0;h < ploan.Length;h++)
        {
        if(fullnamess.Equals(loanerusername[h],StringComparison.OrdinalIgnoreCase)&&contactss.Equals(loanerpass[h],StringComparison.OrdinalIgnoreCase))
        {
            Console.WriteLine("Enter current password: ");
            string currentpassword = Console.ReadLine();
            for(int i=0;i<ploan.Length;i++)
            {
                if(currentpassword.Equals(loanerpass[i],StringComparison.OrdinalIgnoreCase))
                {
                    
                    do{
                    Console.Write("Enter new password: ");
                    newpasswordsss = Console.ReadLine();
                    if(newpasswordsss.Length<4)
                    {
                        Console.WriteLine("Password must be 4 letters up!");
                    }
                    }while(newpasswordsss.Length<4);
                    loanerpass[i]=newpasswordsss;
                    Console.Write("Successfully change password!\n\n\n");
                    Console.WriteLine("\n\n\nPress any key to continue....");
                    Console.ReadKey();
                    User();
                    
                }
                else if(i<ploan.Length)
                {
                    Console.WriteLine("Invalid Password!");
                    Console.WriteLine("\n\n\nPress any key to continue....");
                    Console.ReadKey();
                    User();
                }
                else
                {
                    continue;
                }
            }
        }
        }
        }
    }

View IL Code