c语音-作业

#include <stdio.h>
int main(){
	int month, year;
    printf("请输入月份：");
    scanf("%d", &month);

    switch (month) {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            printf("这个月有31天\n");
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            printf("这个月有30天\n");
            break;
        case 2:
            printf("请输入年份：");
            scanf("%d", &year);
            if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
                printf("这个月有29天\n");
            } else {
                printf("这个月有28天\n");
            }
            break;
        default:
            printf("没有你要的月份\n");
    }
    return 0;
} 

运行效果