#include <iostream>
#include <string>//注意这里的头文件!
#include<conio.h>
using namespace std;
void main( void )
{
cout<<"请输入密码: "<<endl;
string password;
int i=0;
char ch;
while ((ch=_getch())!=13)
{
password+=ch;//string对象重载了+=
cout<<"*";
}
cout<<endl<<"输入完毕!您输入的是: "<<password<<endl;
}原文:http://blog.csdn.net/rememberautumn/article/details/18458225