C Program to Check Whether a Number is Even or Odd

This program takes a number as input and checks whether it is even or odd using the modulus operator (%).

Concept Overview

A number is even if it is divisible by 2, i.e., number % 2 == 0. Otherwise, it is odd. We use if-else statements to determine the result.

Program

#include <stdio.h>

int main() {
    int num;

    printf("Enter a number: ");
    scanf("%d", &num);

    if (num % 2 == 0)
        printf("%d is an even number.\n", num);
    else
        printf("%d is an odd number.\n", num);

    return 0;
}

Sample Output

Enter a number: 15
15 is an odd number.

Explanation

• `num % 2 == 0` – Checks if the number is divisible by 2 (even).
• `printf()` – Displays whether the number is even or odd.