In C++, the problem of implementing inheritance polymorphism

Question

In the header file, the inherited base class always reports an error when compiling: expected class-name before '{' token

Answer 1

I feel this has nothing to do with inheritance, it’s just that you wrote the code wrong

Answer 2

It should be that your code is written wrong. You can post the code so that I can help you analyze it in detail

#ifndef MAN_H 
#define MAN_H 
#include "person.h"
class Man :public person
{
public:
    Man();
    void helpForOthers();
};

#endif//MAN_H

int main()
{
    return 0;
}

This should be fine

Answer 3