3.C Program to Add Two Integers

C Program to Add Two Integers

In this program, user is asked to enter two integers. Then, the sum of those two integers is stored in a variable and displayed on the screen.

To understand this example, you should have the knowledge of following C programming topics:

• C Programming Data Types
• C Programming Constants and Variables
• C Programming Input Output (I/O): printf() and scanf()
• C Programming Operators

Program to Add Two Integers

#include <stdio.h>
int main()
{
    int firstNumber, secondNumber, sumOfTwoNumbers;
    
    printf("Enter two integers: ");

    // Two integers entered by user is stored using scanf() function
    scanf("%d %d", &firstNumber, &secondNumber);

    // sum of two numbers in stored in variable sumOfTwoNumbers
    sumOfTwoNumbers = firstNumber + secondNumber;

    // Displays sum      
    printf("%d + %d = %d", firstNumber, secondNumber, sumOfTwoNumbers);

    return 0;
}

Output

Enter two integers: 12
11
12 + 11 = 23

In this program, user is asked to enter two integers. Two integers entered by the user is stored in variables firstNumber and secondNumber respectively. This is done using scanf() function.

Then, variables firstNumber and secondNumber are added using + operator and the result is stored in sumOfTwoNumbers.

Finally, the sumofTwoNumbers is displayed on the screen using printf() function.

Check out these related examples:

• C Program to Make a Simple Calculator Using switch...case
• C Program to Swap Two Numbers
• C Program to Multiply two Floating Point Numbers