本月天数

////  main.cpp//  project////  Created by 徐伟 on 6/8/16.//  Copyright © 2016 fizz_i. All rights reserved.//#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 ||year%400==0)                days = 29;            else                days =28;    }    cout<<year<<"年"<<month<<"月共有"<<days<<"天。"<<endl;    return 0;  }