错误背后的原因？ [英] Reason behind error?

问题描述

#include<iostream>
using namespace std;
typedef struct student stud
{
    int rno;
    stud *s;
}
int main()
{
    s->rno=30;
    cout<<s->rno;
    return 0;
}

我的尝试：



这个程序显示错误，因为我们无法在内存存在之前为内存提供替代名称。如果是这种情况，那么即使在结构定义之后我们也无法使用typedef，因为在创建变量时会创建结构内存吗？

我的问题是：

是否可以使用typedef关键字创建自我重构结构？

What I have tried:

is this program showing error because we can't give an alternative name to a memory before its existence.If this is the the case then we couldn't have been able to use typedef even after structure definition, since a structure memory is created when it's variable is created?
my question is:
is it possible to create self-refrential structure using typedef keyword?

推荐答案

该程序显示错误，因为有错误...

请注意您不需要 typedef struct s in C ++ 。

尝试

The program is showing errors because there are errors...
Please note you don't need to typedef structs in C++.
Try

#include<iostream>
using namespace std;

struct stud
{
    int rno;
    stud *s;
};

int main()
{
    stud * s = new stud();
    s->rno=30;
    s->s = nullptr;
    cout << s->rno <<endl;
    delete s;

    return 0;
}

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