如何在类中声明一个结构体？ [英] How do I declare a struct within a class?

问题描述

我想在一个类中声明一个结构体，该结构体是私有的，我想给同一个结构体中的变量赋予一个字符值，但是我不能初始化它或者它：

I want to declare a struct within a class which is private and I want to give a character value to a variable in the same struct, but I can't initialize it or cin it:

class puple
{
private:
    struct p
    {
        char name[25];
        int grade;
    };
public:
    puple(){};
    void setme()
    {
        this->p::grade=99;
        this->p::name[25]='g';  //here is the problem
    }
    void printme()
    {
        cout<<"Name:  "<<this->p::name<<endl;
        cout<<"Grade:  "<<this->p::grade<<endl;
    }
};
void main()
{
    puple pu1;
    pu1.setme();
    pu1.printme();
}

推荐答案

称为p，它是一个结构体。还没有类型p的东西。因此您的

You've describe a type called "p" which is a struct. There is yet no thing of type p around. Therefore your

p->...

调用没有任何意义。

尝试声明

p pInstance;

并使用它，例如：

void setme()
{
    this->pInstance.grade=99;
    this->pInstance.name[25]='g';  //here is the problem
}

请注意， ]将失败，因为该数组的允许索引为0到24（总共25个元素）。

Note even with this your assignment to name[25] will fail as the allowed indices for that array are 0 up to 24 (totalling 25 elements).

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