// 我没有遇到这个问题，代码是这样的。

#include <iostream>

#include <stdlib.h>

#include <string>

using namespace std;

int main(void)

{

    string name;

    cout << "Please input your name:";

    getline(cin, name);

    if(name.empty())

    {

        cout << "input is null." << endl;

        return 1;

    }

    if(name == "imooc")

    {

        cout << "you are a administractor" << endl;

    }

    cout << "hello " + name << endl;

    cout << "your name length:" << name.size() << endl;

    cout << "your name first letter is:" << name[0] << endl;

    return 0;

}