#include <iostream>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
	//目的：.switch判斷某月有幾天 
	cout<<"輸入月份(1~12) = ";
	int month;
	cin>>month;
	cout<<endl;
	
	switch(month){
		case 2:
			cout<<month<<"月有28天，或29天"<<endl;
			break;
		case 1:
		case 3:
		case 5:
		case 7:
		case 8:
		case 10:
		case 12:	
			cout<<month<<"月有31天"<<endl;
			break;	
		case 4:
		case 6:
		case 9:
		case 11:		
			cout<<month<<"月有30天"<<endl;
			break;				
		default:
			cout<<"輸入錯誤"<<endl;
			break;	 
	} 
	return 0;
}