using System;
public class Program
{
public static void Main()
//if else task
/*Console.WriteLine("Enter the username: ");
string input = Console.ReadLine();
if(input=="Sowaiba"||input=="sowaiba")
Console.WriteLine("Login successful");
}
else
Console.WriteLine("Invalid Username");
}*/
//if else if
/*Console.WriteLine("Grade Calculation Calculator");
Console.WriteLine("Enter your marks: ");
int marks = int.Parse(Console.ReadLine());
if(marks>=90)
Console.WriteLine("Your grade is A+");
else if(marks<90 && marks >=80)
Console.WriteLine("Your grade is A");
else if(marks>=70 && marks<80)
Console.WriteLine("Your grade is B");
else if(marks>=50 && marks<60)
Console.WriteLine("Your grade is C");
Console.WriteLine("You failed the exam");
//task 3 nested if
/*Console.WriteLine("Enter your email");
string email = Console.ReadLine();
if(email == "sowaibaarshad@gmail.com")
Console.WriteLine("Enter Password: ");
string password = Console.ReadLine();
if(password == "b212002")
Console.WriteLine("Access Granted");
Console.WriteLine("Wrong Password");
Console.WriteLine("Email is not registered");
//task 4
Console.WriteLine("Menu");
Console.WriteLine("1)Pizza");
Console.WriteLine("2)Burger");
Console.WriteLine("3)Sweets");
Console.WriteLine("Enter your desired choice: ");
int input = int.Parse()
