C Program to Subtract Two Numbers

This program demonstrates how to subtract two numbers in C, a basic operation for beginners to learn arithmetic operations and input-output functions.

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

Concept Overview

C programming allows arithmetic operations using basic operators. The '-' operator is used to subtract one number from another.

Program

#include <stdio.h>

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

    // Ask the user to enter two numbers
    printf("Enter first number: ");
    scanf("%d", &num1);

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

    // Perform subtraction
    difference = num1 - num2;

    // Display the result
    printf("Difference = %d\n", difference);

    return 0;
}

Output

Enter first number: 15
Enter second number: 7
Difference = 8

Explanation

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