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C# | Find the addition of two integer numbers



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.
Submitted by IncludeHelp, on December 05, 2018

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

Program:

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



Using function

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

Program:

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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