/*
Given a year (an integer number), say if it is a leap year.
A leap year is divisible by 4, but not by 100.
An exception are the years divisible by 400, which are leap years.
*/

#include <stdio.h>


int main(void){
  int leap=0;
  int year;

  printf("Insert an year: ");
  scanf("%d", &year);

  /* First solution: base on a support varible leap */
  if ( year%4==0 )   /* divisible by 4 */
    leap=1;

  if ( year%100==0 ) /* but not by 100 */
    leap=0;

  if ( year%400==0 ) /* but year divisible by 400 are leap years */
    leap=1;

  if ( leap==1 ){
    printf("%d is a leap year\n", year);
  }else{
    printf("%d is not a leap year\n", year);
  }

  /* Second solution: using a boolean expression */
  if ( (year%4==0 && year%100!=0) || year%400==0 ){
    printf("%d is a leap year\n", year);
  }else{
    printf("%d is not a leap year\n", year);
  }

  return 0;
}