STL 之 map

#include <iostream>#include <map>#include <string>using namespace std;void main(){map<string, string> user;user["jianan"] = "12345";user["dami"] = "fdmy";string name, password;while(1){cout<<"请输入用户名:";cin>>name;if(user[name].empty()){cout<<"不存在该用户,请重新输入"<<endl<<endl;continue;}cout<<"请输入密码:";cin>>password;       if(user[name] == password){cout<<"登陆成功"<<endl;break;}else{cout<<"登陆失败,请重新登陆"<<endl;}}}/*请输入用户名:jiananm不存在该用户,请重新输入请输入用户名:jianan请输入密码:12345登陆成功*/