C：简单判断年份的平润;

#include <stdio.h>

int main(void){
    int year=0;

    scanf("%d",&year);
    if((year%4==0&&year%100!=0)||year%400==0)
        printf("%d is a leap year.",year);
    else
        printf("%d is not a leap year.",year);

    return 0;
}