To cheak leap year or not

#include<stdio.h>
#include<conio.h>
void main()
{
  int year;
  clrscr();
  printf("enter year");
  scanf("%d",&year);
  if(year%100==0)
      {
        if(year%400==0)
        {
           printf("this is leap year");
         }
         else
           { printf("year is not a leap year");
           } 
        }
   else if(year%4==0)
      {
        printf("year is a leap year");
      }
  getch();
}