Building simple function to inherit 3 classes in C-CodePudding

I have created 3 classes - GrandMother, Mother and Daughter. I wrote a code such that the Daughter class inherits from the Mother class and the Mother class inherits from the GrandMother calss.

GrandMother.h :-

#ifndef GRANDMOTHER_H
#define GRANDMOTHER_H


class GrandMother
{
    public:
        GrandMother();
        ~GrandMother();
};

#endif // GRANDMOTHER_H

Mother.h :-

#ifndef MOTHER_H
#define MOTHER_H


class Mother: public GrandMother
{
    public:
        Mother();
        ~Mother();
};

#endif // MOTHER_H

Daughter.h :-

#ifndef DAUGHTER_H
#define DAUGHTER_H


class Daughter: public Mother
{
    public:
        Daughter();
        ~Daughter();
};

#endif // DAUGHTER_H

GrandMother.cpp :-

#include<iostream>
#include "Mother.h"
#include "Daughter.h"
#include "GrandMother.h"
using namespace std;

GrandMother::GrandMother()
{
    cout << "Grand Mother Constructor!!" << endl;
}

GrandMother::~GrandMother()
{
    cout << "Grand Mother Deconstroctor" << endl;
}

Mother.cpp :-

#include<iostream>
#include "Mother.h"
#include "Daughter.h"
#include "GrandMother.h"
using namespace std;

Mother::Mother()
{
    cout << "Mother Constructor!!" << endl;
}

Mother::~Mother()
{
    cout << "Mother Deconstroctor" << endl;
}

Daughter.cpp:-

#include<iostream>
#include "Mother.h"
#include "Daughter.h"
#include "GrandMother.h"
using namespace std;

Daughter::Daughter()
{
    cout << "Daughter Constructor!!" << endl;
}

Daughter::~Daughter()
{
    cout << "Daughter Deconstroctor" << endl;
}

main.cpp :-

#include<iostream>
#include "Mother.h"
#include "Daughter.h"
#include "GrandMother.h"
using namespace std;

int main(){
    //GrandMother granny;

    //Mother mom;

    Daughter baby;
}

When I am running the code, it's giving me the following error:- error: expected class-name before '{' token

Can anyone plz tell me what part of my code is wrong.

CodePudding user response：

Your header are not self-contained, so you have to include them in right order:

#include "GrandMother.h"
#include "Mother.h"
#include "Daughter.h"

but it is fragile.

Right way is to make the header self contained:

#ifndef GRANDMOTHER_H
#define GRANDMOTHER_H

class GrandMother
{
public:
    GrandMother();
    ~GrandMother();
};

#endif // GRANDMOTHER_H

#ifndef MOTHER_H
#define MOTHER_H

#include "GrandMother.h"

class Mother: public GrandMother
{
public:
    Mother();
    ~Mother();
};

#endif // MOTHER_H

#ifndef DAUGHTER_H
#define DAUGHTER_H

#include "Mother.h"

class Daughter: public Mother
{
public:
    Daughter();
    ~Daughter();
};

#endif // DAUGHTER_H