C++ 模板的应用——智能指针、STL库

#include "head.h"
#include <stdio.h>
using namespace std;

void registerUser(vector<string>& number,vector<string>& passwd){
	string username;
	string Passwd;
	cout << "请输入账号:" << endl;
	cin >> username;
	cout << "请输入密码:" << endl;
	cin >> Passwd;
	typename vector<string>::iterator it = number.begin();
	for(it;it!=number.end();it++)
	{
		if(*it==username)
		{
			cout << "账号已存在" << endl;
			return;
		}
	}
	number.push_back(username);
	passwd.push_back(Passwd);
	cout << "注册成功" << endl;
}
void login(vector<string>& number,vector<string>& passwd){
	string username;
	string Passwd;
	cout << "请输入账号:" << endl;
	cin >> username;
	cout << "请输入密码:" << endl;
	cin >> Passwd;
	typename vector<string>::iterator it1 = number.begin();
	typename vector<string>::iterator it2 = passwd.begin();
	for(it1,it2;it1!=number.end();it1++,it2++)
	{
		if(*it1==username && *it2==Passwd){
			cout << "登陆成功" << endl;
			return;
		}
	}
	cout << "账号密码有误" <<endl;
	return;

}
int main(int argc, const char *argv[])
{
	vector<string> number;
	vector<string> passwd;
	int ch;
	while(1){
		cout << "1.注册" << endl;
		cout << "2.登录" << endl;
		cout << "3.退出" << endl;
		cout << "请选择操作" << endl;
		cin >> ch;
		switch(ch){
		case 1:
			registerUser(number,passwd);
			break;
		case 2:
			login(number,passwd);
			break;
		case 3:
			cout << "=================退出系统====================" << endl;
			return 0;
		default:
			cout << "无效选择" << endl;
		}
	}

	return 0;
}