switch语句

#include<iostream>

using namespace std;

int main ()

{
int i;
cout << "今天星期几：";
cin >> i;

switch(i)  // 输入几将后边的都输出出来，贯穿所有，除非将后边加上break; 就不会发生贯穿了，
{
case 1:    //case 后边必须是整数，case默认的判断就是等于，
cout << "switch: 今天星期一。" << endl;
break;
case 2:
cout << "switch: 今天星期二。" << endl;
break;
case 3:
cout << "switch: 今天星期三。" << endl;
case 4:
cout << "switch: 今天星期四。" << endl;
case 5:
cout << "switch: 今天星期五。" << endl;
case 6:
cout << "switch: 今天星期六。" << endl;
case 7:
cout << "switch: 今天星期日。" << endl;
default :
cout << "switch: 错误的输入。" << endl;

}

/*	if(i==1)
cout << "星期一" << endl;
else if(i==2)
cout << "星期二" << endl;
else if(i==3)
cout << "星期三" << endl;
else if(i==4)
cout << "星期四" << endl;
else if(i==5)
cout << "星期五" << endl;
else if(i==6)
cout << "星期六" << endl;
else if(i==7)
cout << "星期日" << endl;
else
cout << "错误的输入。" << endl;
*/
return 0;
}