C Program to Check Whether a Number is Even or Odd

What are even and odd numbers?

An even number is an integer which is divisible by 2. For example : 0, 2, 4, 6, 8.....etc.

An odd number is an integer which is not divisible by 2. For example: 1, 3, 5, 7, 9....etc.

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Program to Check Even or Odd

#include <stdio.h>

int main() {
  int num;
  printf("Enter a number : ");
  scanf("%d", &num);
  if(num % 2 == 0) {
    printf("%d is a even number", num);
  }
  else {
    printf("%d is a odd number", num);
  }
  return 0;
}

Output

Enter a number : 12
12 is a even number

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Working of the above program

• First we declare a integer variable num.

int num;

• Then we asked the user to enter a number.

printf("Enter a number : ");

• Then we take the user input using scanf() function and store the entered value in num variable.

scanf("%d", &num);

• Finally, we use if...else statement in which if statement has a condition to check num % 2 == 0 i.e. on dividing num by 2 we get 0 as remainder or not (completely divisible by 2 or not).

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