using System;

public class Program

{

    public static void Main()

    {

        Greet();

        M(567985,6229);

        M("Katsuki","Bakugo");

    }

    public static void Greet() 

    {

        string n; 

        Console.WriteLine(" WELCOME TO BASIC CALCULATOR ");

        Console.WriteLine( );

        Console.WriteLine(" please enter your name here : ");

        n=Console.ReadLine();

        Console.WriteLine( );

        Console.WriteLine(" welcome " + n + " this is a program used to perform basic functions ");

        Console.WriteLine( );

        Cal();

        Lop();

    }

    public static void Cal() 

    {

        string e;

        string in1;

        string in2;

        string in3;

        int x;

        int y;

        int z;

        Console.WriteLine();    

    const string yn = "would you like further instruction ? type in yes or no ";

    Console.WriteLine(yn);  

    Console.WriteLine();

    e=Console.ReadLine();

    if(e== "yes")

    {

    const string co1 = "INSTRUCTIONS:";

    Console.WriteLine(co1);

    Console.WriteLine();

    const string co2 = "A) FOR INCREMENTS: ";

    Console.WriteLine(co2);

    const string co3 = " for a prefix increment for the first input please type '++X' in the operator.";

    Console.WriteLine(co3);

    const string co4 = " for a postfix increment for the first input please type 'X++' in the operator.";

    Console.WriteLine(co4); 

    const string co5 = " for the prefix increment for the second input please type in '++Y' in the operator.";  

    Console.WriteLine(co5); 

    const string co6 = "for postfix increment on the second input please type in 'Y++' in the operator.";

    Console.WriteLine(co6); 

    Console.WriteLine();    

    const string co7 = "B) FOR DECREMENTS: ";

    Console.WriteLine(co7);

    const string co8= " for the prefix decrement for the first input please type '--X' in operators.";

    Console.WriteLine(co8);

    const string co9 = "for the postfix decrement for the first input please type 'X--' in operators.";

    Console.WriteLine(co9); 

    const string co10= " for the prefix decrement for the second input please type '--Y' in operators.";    

    Console.WriteLine(co10);

    const string co11 = "for the postfix decrement for the second input please type 'Y--' in operators.";   

    Console.WriteLine(co11);    

    Console.WriteLine();

    }

    else if (e=="no")

    {

        Console.WriteLine("instruction will no longer be shown");   

        Console.WriteLine();

    }

    Console.WriteLine("enter first input: ");

    in1=Console.ReadLine();

    Console.WriteLine("enter operator: ");

    in3=Console.ReadLine(); 

    Console.WriteLine("enter second input: ");

    in2=Console.ReadLine();

    x=Convert.ToInt32(in1);

   y=Convert.ToInt32(in2);

​

    if (in3 == "+") 

    {

         z = x+y;

        Console.WriteLine("the sum is : " + z);

    }

   else if (in3 == "-")

    {

        z = x-y;

        Console.WriteLine("the difference is : " + z);

    }

    else if (in3 == "/")

    {

        z = x/y;

        Console.WriteLine("the quotient is : " + z);

    }

    else if (in3=="*")

    {

        z = x*y;

        Console.WriteLine("the product is : " + z);

    }

    else if (in3 == "++X")

    {

        z = ++x;

        Console.WriteLine("the prefix increment of X : " + z);

    }

    else if (in3== "X++")

    {

        z = x++;

        Console.WriteLine("the postfix increment of X : " + z);

    }

    else if (in3=="Y++")

    {

        z = y++;

        Console.WriteLine("the postfix increment of Y : " + z);

    }

    else if (in3=="++Y")

    {

        z = ++y;

        Console.WriteLine("the prefix increment of Y : " + z);

    }

    else if (in3=="X--")

    {

        z = x--;

        Console.WriteLine("the postfix decrement of X: " + z);

    }

    else if (in3 == "--X")

    {

        z = --x;

        Console.WriteLine("the prefix decrement of X: " + z);

    }

    else if (in3 == "Y--")

    {

        z = y--;

        Console.WriteLine("the postfix decrement of Y: " + z);

    }

    else if (in3 == "--Y")

    {

        z = --y;

        Console.WriteLine("the prefix decrement of Y : " + z);

    }   

        Console.WriteLine();

        Con();

    }

    public static void Lop() // Loops

        {

        int n;

        int i;

        int j;

        int k;

            n=7;

        for ( i = n; i <= n; i++)

        {

            Console.WriteLine(" "+"  "+" "+" *");

            for (j = i; j <= n; j++)

            {

                Console.WriteLine(" "+" "+" * * * ");

            }

            for ( k = j ; k<=j; k++)

            {

                    Console.WriteLine(" " +"* * *"+" * * ");    

                }

            Console.WriteLine();

            Console.WriteLine("THANK YOU FOR TESTING OUR PROGRAM");

            Console.WriteLine();

        }

}

    public static void Con() 

    {

        string a;

        Console.WriteLine(" if you would like to close this program, type ''exit'' ");

        a=Console.ReadLine();

        Console.WriteLine();

        if(a == "exit")

        {

            Console.WriteLine(" YOU HAVE EXITED THE PROGRAM ");

        }

        else

        {

            Console.WriteLine(" ERROR PROGRAM IS STILL RUNNING ");

        }

    }

    public static void M (int c, int d) 

    {

        int sn = c + d;

        Console.WriteLine (sn);

    }

    public static void M (string c, string d)

    {

        string sn = c + " " + d;

        Console.WriteLine(sn);

    }

}