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C Program to check whether the number is even or odd.

Last updated on July 27, 2020

What are Even or Odd numbers: #

Even Number: A number which is evenly divisible (i.e leaves no remainder) by 2 is called an even number.

Odd Number: A number which is not evenly divisible by 2 is called an odd number.

The following is a C program to check whether a number is even or odd.

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/*************************************************************
 * Program to check whether the entered number is even or odd.
**************************************************************/

#include<stdio.h> // include stdio.h

int main() 
{
    int n;

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

    if(n % 2 == 0)
    {
        printf("%d is even", n);
    }
    else
    {
        printf("%d is odd", n);
    }

    return 0;
}

Expected Output: 1st run:

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Enter a number: 18
18 is even

2nd run:

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Enter a number: 5555
5555 is odd

How it works #

A number is even if it is evenly divisible by 2. To check for even number we simply use remainder operator %. If the number is even then remainder operator will return 0, otherwise, a non-zero value. For example:

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4 % 2 = 0 => 4 is even
11 % 2 = 1 => 11 is odd

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