Leap Year: A year which is divided on four with 0 remainder is called leap year.

#include <stdio.h>
#include <conio.h>
int main()
{
               int year;
               printf("Enter a year to check if it is a leap year: ");
               scanf("%d", &year);

                if (year%400 == 0)
                      printf ("%d is a leap year.\n", year);
               else if ( year%100 == 0)
                      printf ("%d is not a leap year.\n", year);
               else if ( year%4 == 0 )
                      printf ("%d is a leap year.\n", year);
               else
                      printf ("%d is not a leap year.\n", year);
                getch();
}