C Program to check given number is even or odd

🧑‍💻 By quescol • 📝 Updated on: 07 May 2025

In this tutorial, we are going to learn a writing program in the C programming language to check a given number is even or odd.

This program is going to be very simple and easy.

Before moving to the program let’s understand

What is an even and odd number?

Even: Even a number is a number that is divided by 2 without leaving any reminder. Here reminder will be 0 in for each even number.

For example, 4,8,44 etc are the even number which is completely divided by 2.

Odd: An odd number is a number that is not fully divided by 2. In each case, it will leave some reminders.

For example: 1,3,5, 19, 25 etc.

How our program will behave.

Our program will take one number as input. It will print “even number” if the input number is even and It will print “odd number” when the input number is odd.

And to check even and odd numbers, we will use the percentile % operator to find the remainder after dividing by 2.

I hope this is clear to you.

So Lets move on to see the Program in C

Even or Odd Number program in C using if-else

#include<stdio.h>
int main() {
  int num;
  printf("Enter a number to check even or odd = ");
  scanf("%d", & num);
  if (num % 2 == 0) {
    printf("Given number %d is even", num);
  } else {
    printf("Given number %d is odd", num);
  }
  return 0;
}

Output 1:

Enter a number to check even or odd = 43
Given number 43 is odd

Output 2:

Enter a number to check even or odd = 22
Given number 22 is even

Even or odd Number Program in C using Function

#include<stdio.h>
void oddEven(int num) {
  if(num%2==0){
    printf("Given number %d is even",num);
 }else{
    printf("Given number %d is odd",num);
 }
}
int main()
{
 int num;
 printf("Enter a number to check even or odd = ");
 scanf("%d",&num);
 oddEven(num);
 return 0;
}

Output 1:

Enter a number to check even or odd = 45
Given number 45 is odd

Output 2:

Enter a number to check even or odd = 22
Given number 22 is even