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Add Two Numbers in C#

C# program to find the addition of two integer numbers: Here, we are writing a C# program that will read two integer numbers and find their sum. By IncludeHelp Last updated : April 15, 2023

Adding two numbers

Given (input) two integer numbers and we have to find the addition of given number in C#.

Example

Input:
First number: 10
Second number: 20

Output:
Addition of 10 and 20 is = 30

C# program to add two numbers

using System;

class AddTwoNumbers {
  static void Main() {
    try {
      //declare two variables
      int a = 0;
      int b = 0;

      //input numbers
      Console.Write("Enter first number: ");
      a = Convert.ToInt32(Console.ReadLine());
      Console.Write("Enter second number: ");
      b = Convert.ToInt32(Console.ReadLine());

      //calculating sum
      int sum = a + b;

      Console.WriteLine("Addition of " + a + " and " + b + " is = " + sum);
    } catch (Exception ex) {
      Console.WriteLine("Error: " + ex.ToString());
    }
  }
}

Output

Enter first number: 10
Enter second number: 20
Addition of 10 and 20 is = 30

Adding two numbers using function

Here, we are defining a function that will take two integer arguments and return the sum of the numbers.

C# program to add two numbers using function

using System;

class AddTwoNumbers {
  //defining function
  static int sumOfTwoNumber(int x, int y) {
    return x + y;
  }
  
  //main function
  static void Main() {
    try {
      //declare two variables
      int a = 0;
      int b = 0;

      //input numbers
      Console.Write("Enter first number: ");
      a = Convert.ToInt32(Console.ReadLine());
      Console.Write("Enter second number: ");
      b = Convert.ToInt32(Console.ReadLine());

      //calculating sum by calling the function
      int sum = sumOfTwoNumber(a, b);

      Console.WriteLine("Addition of " + a + " and " + b + " is = " + sum);
    } catch (Exception ex) {
      Console.WriteLine("Error: " + ex.ToString());
    }
  }
}

Output

Enter first number: 10
Enter second number: 20
Addition of 10 and 20 is = 30

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