5.5 判斷是否閏年

#include <stdlib.h>

int main()
{int year,flag;
    printf("Enter year:");
    scanf("%d",&year);
        if(year/4==0&&year/100!=0)
            flag=1;
        else
            flag=0;
        if(year/400==0)
        {
            printf("%d is a leap year!\n",year);
        }
        else
        {
            printf("%d is not a leap year!\n",year);
        }

    return 0;
}

總結：做題時一定要讀懂題意。比如此程序的第一個if和第二個if的關係。