#!/usr/local/bin/tcc
int isleap(int y) {
  return y%25>0>y%4|y%16<1;
}
#include <stdio.h>
int main(){
    int y[] = {1900,1901,1902,1903,1904,2000,2001,2002,2003,2004};
    for (int i = 0; i < 10; i++) printf("isleap(%d) == %d\n", y[i], isleap(y[i]));
}