例2.3 判定2000-2500年终的每一年是否为闰年。闰年条件：（1）能被4整除但不能被100整除 (2)能被400整除

*#include<stdio.h>

int main() {

for (int year = 2000; year <= 2500; year++) {

 if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {

  printf("%d is run year\n", year);

 }

 else {

  printf("%d isn't run year\n", year);

 }

}  

return 0;

}