91学习

#include <stdio.h>

int main(){

int year;

printf("please enter a year\n");

scanf("%d",&year);

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

printf("%d is a leap year\n",year);

}

else{

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

}

return 0;

}