/* leap-year */
 
#include <stdio.h>
#include <stdlib.h>
 
int isLeap(int year) {
  if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
    return 1;
  else
    return 0;
}
 
int main(void) {
  int year;
  printf("Enter a year:\n");
  if ( scanf("%d", &year) != 1 
       || year <= 0)
  {
    printf ( "invalid year.\n" );
    return EXIT_FAILURE;
  }
  printf("year %d ", year);
  if (isLeap(year))
    printf("is a leap year\n");
  else
    printf("is not a leap year\n");
  return EXIT_SUCCESS;
}   
 

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