C# Program to subtract two numbers

Program

using System;
namespace subtract_two_numbers
{
	class SubtractTwoNumbers
	{
		static void Main(String[] args)
		{
			int a, b;
			Console.Write("Enter first number:\t");
			a = int.Parse(Console.ReadLine());
			Console.Write("Enter second number:\t");
			b = int.Parse(Console.ReadLine());
			int sub = a - b;
			Console.WriteLine("Difference of two numbers: " + sub);
		}
	}
}

This C# program takes two integer inputs from the user, subtracts the second number from the first, and prints the result.

1. using System;

   • Imports the System namespace, which provides built-in functionalities like console input and output.

2. namespace subtract_two_numbers

   • Defines a namespace named subtract_two_numbers to organize related classes.

3. class SubtractTwoNumbers

   • Declares a class named SubtractTwoNumbers, which contains the main logic of the program.

4. static void Main(String[] args)

   • The Main method is the entry point of the program.
   • static means it belongs to the class and does not require an instance.
   • void means the method does not return any value.
   • String[] args allows passing command-line arguments.

5. Declaring Variables:

   • int a, b; → Declares two integer variables to store user input.

6. Reading User Input:

   • Console.Write("Enter first number:\t");

     • Prompts the user to enter the first number.

   • a = int.Parse(Console.ReadLine());

     • Reads the input as a string and converts it to an integer using int.Parse().

   • Similarly, the second number is read and stored in b.

7. Subtracting the Two Numbers:

   • int sub = a - b;
     • Computes the difference between a and b and stores it in sub.

8. Displaying the Result:

   • Console.WriteLine("Difference of two numbers: " + sub);
     • Prints the subtraction result to the console.

Output

$ mcs SubtractTwoNumbers.cs 
$ mono SubtractTwoNumbers.exe 
Enter first number:	456
Enter second number:	23
Difference of two numbers: 433