Value of data members

This is a discussion on Value of data members within the C++ Programming forums, part of the General Programming Boards category; I'm not sure what I am doing!? I am trying to understand inheritance and want to see what values get ...

  1. #1
    Unregistered
    Guest

    Question Value of data members

    I'm not sure what I am doing!?
    I am trying to understand inheritance and want to see what values get passed by using my main().

    I'm not too sure if my argument constructors are correct.

    #include <iostream.h>

    class Class_A
    {
    private:
    int A_private;
    protected:
    int A_protected;
    public:
    Class_A(int, int);
    void A_Pub_Func();
    };

    class Class_B : public Class_A
    {
    private:
    int B_private;
    protected:
    int B_protected;
    public:
    Class_B(int, int);
    void B_Pub_Func();
    };

    class Class_C : private Class_A
    {
    private:
    int C_private;
    protected:
    int C_protected;
    public:
    Class_C(int, int);
    void C_Pub_Func();
    };

    class Class_D : public Class_B
    {
    private:
    int D_private;
    protected:
    int D_protected;
    public:
    Class_D(int, int);
    void D_Pub_Func();
    };

    class Class_E : public Class_C
    {
    private:
    int E_private;
    protected:
    int E_protected;
    public:
    Class_E(int, int);
    void E_Pub_Func();
    };

    Class_A::Class_A(int a, int b) {
    A_private = a;
    A_protected = b;
    }

    Class_B::Class_B(int a, int b) {
    B_private = a;
    B_protected = b;
    }

    Class_C::Class_C(int a, int b) {
    C_private = a;
    C_protected = b;
    }

    Class_D::Class_D(int a, int b) {
    D_private = a;
    D_protected = b;
    }

    Class_E::Class_E(int a, int b) {
    E_private = a;
    E_protected = b;
    }

    void main()
    {
    Class_A a_object(1,1);
    Class_B b_object(2,2);
    Class_C c_object(3,3);
    Class_D d_object(4,4);
    Class_E e_object(5,5);
    }

  2. #2
    Registered User raimo's Avatar
    Join Date
    Jun 2002
    Posts
    107
    If Class_A is a superclass of Class_B, then you should write B:s constructor like this:
    Code:
    Class_B::Class_B(int a, int b) : Class_A(a,b) { 
      B_private = a; 
      B_protected = b; 
    }
    ..because you have no default constructor in Class_A.
    Do this to all inherited classes.

    Btw, you should write int main () instead of void main(). This is the standard way to do it. Find more with google.

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