C语言编程输入年份和月份，输出该年该月的天数。（提示：总体使用switch结构，对于二月需判断该年是否为闰年）

#include <stdio.h>

int main()
{
    int year, month, days;
    printf("请输入年份和月份（格式：yyyy mm）：");
    scanf("%d %d", &year, &month);
    switch (month)
    {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            days = 31;
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            days = 30;
            break;
        case 2:
            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
            {
                days = 29;
            }
            else
            {
                days = 28;
            }
            break;
        default:
            printf("输入的月份有误！\n");
            return 1;
    }
    printf("%d年%d月有%d天\n", year, month, days);
    return 0;
}