Write a Program to Check whether given input is Leap Year or not

#include <stdio.h>
int main()
{
 int year;
 printf("Enter a year: ");
 scanf("%d",&year);
 if(year%4 == 0)
  {
   if( year%100 == 0)
   {
    // year is divisible by 400, hence the year is 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;
}

Enter a year: 1900
1900 is not a leap year.

A leap year is exactly divisible by 4 except for century years (years ending with 00). The century year is a leap year only if it is perfectly divisible by 400.