#include <iostream.h>
void main()
{
    int key;
retry:
    cout<<"please enter the password"<<endl;
    cin>>key;
    if(key==123)
    {
        cout<<"your password is right."<<endl;
    }
    else
    {
        cout<<"your password is wrong."<<endl;
        goto retry;
    }
}
    本人初学VC++,今天写了这个简单的程序,一开始觉得运行不错,但后来在输入字符型的密码后,发现程序不断地输出"please enter your password"这句话,麻烦高手解释一下这到底是怎么回事啊?

#include <iostream.h>
#include<stdio.h>
void main()
{
    int key;
retry:
    cout<<"please enter the password"<<endl;
    cin>>key;
    fflush(stdin);
    if(key==123)
    {
        cout<<"your password is right."<<endl;
    }
    else
    {
        cout<<"your password is wrong."<<endl;
        goto retry;
    }
}

请问你加的这个：fflush(stdin);是什么意思？为什么加它程序就变得ok拉呢？谢谢！

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