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In this example, the user is asked to enter two integers. Then, the sum of these two integers is calculated and displayed on the screen.

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

• C Data Types
• C Variables, Constants and Literals
• C Input Output (I/O)
• C Programming Operators

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Program to Add Two Integers

#include 
int main() {    

    int number1, number2, sum;
    
    printf("Enter two integers: ");
    scanf("%d %d", &number1, &number2);

    // calculating sum
    sum = number1 + number2;      
    
    printf("%d + %d = %d", number1, number2, sum);
    return 0;
}

Output

Enter two integers: 12
11
12 + 11 = 23

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In this program, the user is asked to enter two integers. These two integers are stored in variables number1 and number2 respectively.

printf("Enter two integers: ");
scanf("%d %d", &number1, &number2);

Then, these two numbers are added using the + operator, and the result is stored in the sum variable.

sum = number1 + number2;

Finally, the printf() function is used to display the sum of numbers.

printf("%d + %d = %d", number1, number2, sum);