check leap year

#include<stdio.h>
#include<conio.h>
void main()
{
int year;
clrscr();
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);

getch();
}