My leapYear function

//Date: 14-03-2014
//Leap Year Function
//1581, 1582, 1900, 1990, 1999, 2000, 2014, 4000

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#define START_OF_GREG_CALENDAR 1582

int isLeapYear (int year)
int main (int argc, char* argv []) {
   printf ("Please enter a year after 1582\n");
   if (year < 1582) {
     printf ("Please enter a year greater than 1582\n");
    }else{
     scanf ("%d", year)
   if ((year % 400)==0){
     if ((year % 100) ==0 {


}