C Program to Add Two Numbers

This is one of the simplest programs in C and is often the first step for beginners learning programming logic and syntax.

In this tutorial, you’ll learn how to write a C program to take two numbers as input, add them, and display the result.

Concept Overview

C programming allows us to perform arithmetic operations using basic operators. The '+' operator is used to add two numbers.

Program

#include <stdio.h>

int main() {
    int num1, num2, sum;

    printf("Enter first number: ");
    scanf("%d", &num1);

    printf("Enter second number: ");
    scanf("%d", &num2);

    sum = num1 + num2;

    printf("Sum = %d\n", sum);

    return 0;
}

Output

Enter first number: 8
Enter second number: 12
Sum = 20

Explanation

• `#include ` – Includes the standard input-output library for using `printf()` and `scanf()` functions.
• `int num1, num2, sum;` – Declares three integer variables.
• `scanf()` – Takes user input for the two numbers.
• `sum = num1 + num2;` – Performs the addition operation.
• `printf()` – Displays the result on the screen.