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#include <time.h>
int __isleap(int year) {
/* every fourth year is a leap year except for century years that are
* not divisible by 400. */
/* return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
return (!(year%4) && ((year%100) || !(year%400)));
}
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