c++作业3-本月几天

#include <iostream>    using namespace std;    int main()    {        int year,month,days;        cout<<"请输入年份:";        cin>>year;        cout<<"请输入月份:";        cin>>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%400==0||year%4==0&&year%100!=0)                days=29;            else                days=28;        }        cout<<year<<"年份"<<month<<"天数是:"<<days<<endl;        return 0;    }    

运行结果：