c++switch的基本用法

switch只能接受整型和字符型:

整型:

#include <iostream>using namespace std;int main(void){     int a;  while(true) {    cin >> a;     switch(a) {      case 1:        cout <<  "hi" << endl;        break;      case 2:        cout << "hello" << endl;        break;      default:        cout << "goodbye" << endl;    }  }}

字符型

#include <iostream>using namespace std;int main(void){     char a;  while(true) {    cin >> a;     switch(a) {      case 'b':        cout <<  "hi" << endl;        break;      case 'c':        cout << "hello" << endl;        break;      default:        cout << "goodbye" << endl;    }  }}