C Program to Check Leap Year

Write a C program to check whether a entered year is a leap year or not. In this tutorial,  we are going to write a code which take a year as an input and print whether a input year is a leap year or not.

What is Leap Year?

A Leap year is a year which has 366 days, it means it has one additional day. Each leap year has 366 days instead of the usual 365 days.

Algorithm to Check Leap Year

i) If a year is divisible by 4 and not divisible by 100 then it's a leap year.  For example - 2012, 2008 etc.

ii) If a century year (1200, 1600) is divisible by 400  then it's a leap year. For example - 1200, 1600 etc.

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C Program to Check Leap Year using Conditional Operator

We have discussed what is leap and algorithm to check leap year. Let's write a code which takes an input (year) and check whether a input year is a leap year or not.

#include <stdio.h>

int main(void) {
 
      int year;
   
      printf("Enter a year\n");
      scanf("%d",&year);
      
      /* Leap is divisible by 4 but not by 100
         or it is divisible by 400
      */
      if( ( (year%4 == 0) && (year%100!=0) ) 
             || (year%400==0) )
      {
           printf("%d is a leap year.", year );
      }
      else
      {
           printf("%d is not a leap year.", year);
      }

     return 0;     
}

Another way of writing above program.

C program to check whether a number is Palindrome or not

#include <stdio.h>

int main(void) {
 
      int year;
   
      printf("Enter a year \n");
      scanf("%d",&year);
      
      /* Check whether a entered year 
         is divisible by 4 */
      
      if(year%4 == 0)
      {
         /* For century year 
           such as 500,1200 etc */
         
          if( year%100 == 0) 
          {
             /* If it's divisible by 400 
                then it's a leap year */
             
              if ( year % 400 == 0)
              {
                 printf("%d is a leap year.", year);
              }
              else
              {
                 printf("%d is not a leap year.", year);
              }
          }
          else
             printf("%d is a leap year.", year );
      }
      else
      {
         printf("%d is not a leap year.", year);
      }
      
      return 0;
      
}

C Program to Check Leap Year using Function

In this programming example, let's create a function which checks whether an input year is leap year or not.

#include <stdio.h>

bool checkLeapYear(int year) {
    
    /* Leap is divisible by 4 but not by 100
         or it is divisible by 400
    */
      
    if( ( (year%4 == 0) && (year%100!=0) ) 
            || (year%400==0) ) 
    {
        return true;
    }
    else
    {
        return false;
    }
}

int main(void) {
 
      int year;
   
      printf("Enter a year\n");
      scanf("%d", &year);
      
      
      if( checkLeapYear(year) ) 
      {
           printf(" %d is a leap year.", year );
      }
      else
      {
           printf("%d is not a leap year.", year);
      }

     return 0;     
}

Output:


Enter a year  :  2008

2008 is a leap year

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