深入了解switch语句

switch语句

例：输入年份，月份，输出月份天数

上代码

#include <bits/stdc++.h>
using namespace std;
int main()
{
	int year,m;
	cin>> year>>m;
	switch(m)
	   {
		case 1: case 3: case 5: case 7: case 8: case 10: case 12: 
		    cout<< 31<<endl;break;
		case 4: case 6:  case 9: case 11:  
		    cout<< 30<<endl;break;
		case 2:
		    if(!((year % 400) || (year%4) )&& year%100)	
			    cout<<29<<endl;
		    else 
			    cout<<28<<endl; break;}
	return 0;
 } 

注意观察 switch语句的进阶用法