本月有几天

/*Copyright (c) 烟台大学计算机与控制工程学院Author：刘慧艳Created：2014.07.17Edition：V1.0Describe：*/#include <iostream>using namespace std;int main(){    int year,month ,days;    cout<<"请输入年月：";    cin>>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)        days=29;        else        days=28;        break;    }    cout<<year<<"年"<<month<<"月有"<<days<<"天"<<endl;    return 0;}