代码不能接受名称的输入? [英] The code is not able to take the input for name?

问题描述

无法对类进行任何更改，因此我无法添加任何为我设置名称的新函数.

No changes to the class can be done so I cant add any new functions which sets the name for me.

class ele
{

char* name;
public:

ele() :name(nullptr){}
~ele()
{
    if (name)
        delete[]name;
}
char*& GetName(); 
};

#endif

我尝试访问该名称，但在 cin Debug 断言失败后出现错误.无效的空指针.

I try to access the name but it gives me error after cin Debug assertion failed. Invalid null pointer.

>   `     char*& ele::GetName()
    {
    cout << "Please Enter the name"<< endl;
        cin >> this->name;
        return  this->name;
      }`

推荐答案

如果你不能改变你的类(并使用 std::string)你至少需要在 cin> 之前分配内存;>this->name，现在您使用的是 UB 的空指针.因此，您的修复将如下所示:

If you cannot change your class (and use std::string) you need to at least allocate memory before cin>>this->name, now you are using a null poitner which is UB. So your fix would look as follows:

if (this->name == nullptr)
   this->name = new char[64]; // << !!
cin >> this->name;

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