C program to check whether a number is even or odd

In this article, you will learn how to write different programs in C to check whether a number is odd or even. To check whether a number is odd or even, either you can ask a user to enter a number or you can provide a list from which the program can check whether the number is odd or even. Such type of program is generally asked in programming interviews or in the examinations.

A number is even if it is perfectly divisible by 2, and if the remainder is not zero, the number is odd.

Using Modulus operator

To check whether a given number is EVEN or ODD, we are checking modulus by dividing the number by 2. If the modulus is 0, then it will be completely divisible by 2, hence the number will be EVEN, otherwise it will be ODD.

#include <stdio.h>
int main()
{

    int num;

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

    // Using modulus operator

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

    return 0;
}

Please enter a number : 45
45 is an odd number.

Please enter a number : 52
52 is an even number.

Using Ternary operator

The ternary operator is an operator that exists in some programming languages, which takes three operands rather than the typical one or two that most operators use. Here, we have used the ternary operator to check the odd even number using C -

#include <stdio.h>
int main() {
    int num;
    printf("Please enter a number : ");
    scanf("%d", &num);

    (num % 2 == 0) ? printf("%d is even number.", num) : printf("%d is odd number.", num);
    return 0;
}

Please enter a number : 46
46 is even number.

Using Bitwise Operator

Here, we have checked the given number is odd and even using Bitwise & operator. In this approach, we have checked whether the last bit of the given number N is 1 or not. If the result of (N & 1) is 1, then print "Odd". Otherwise, print "Even".

#include<stdio.h>

int main()
{
   int num;

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

   if ( num & 1)
      printf("%d is an odd number", num);
   else
      printf("%d is an even number", num);

   return 0;
}

Please enter a number : 92
92 is an even number

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