c program to check leap year

#include <stdio.h>
 
main()
{
   int year;
 
   printf("Enter a year to check if it is a leap year\n");
   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);   
 
   return 0;
}