Setting up a class

From:

Michael Bell <michael@beaverbell.co.uk>

Newsgroups:

comp.lang.c++

Date:

Thu, 01 Nov 2007 12:34:24 GMT

Message-ID:

<7177eb3a4f.michaelbell@michael.beaverbell.co.uk>

Using Borland Builder 5 I am trying to get a very simple first working
use of a class to work. Following the example of the OU course MT262
as nearly as I can, I have Created files named Class First,
ClassSecond, and ClassThird. And it's still wrong!
It is a windows application, but I don't think that's relevant.
ClassFirst.cpp
//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop
USERES("ClassFirst.res");
USEFORM("ClassFirstU.cpp", Form1);
USEFORM("ClassSecond.cpp", Frame1); /* TFrame: File Type */
USEUNIT("ClassThird.cpp");
USEUNIT("ClassSecond.cpp");
//---------------------------------------------------------------------------
WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
        try
        {
                 Application->Initialize();
                 Application->CreateForm(__classid(TForm1), &Form1);
                 Application->Run();
        }
        catch (Exception &exception)
        {
                 Application->ShowException(&exception);
        }
        return 0;
}
//-------------------------------------

ClassFirstU.h

//---------------------------------------------------------------------------

#ifndef ClassFirstUH
#define ClassFirstUH
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include "ClassSecond.h"
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
        TEdit *Box;
        TEdit *Operator;
        TEdit *Show1;
        TEdit *Input1Box;
        TLabel *Label1;
        TLabel *Label2;
        TLabel *Label3;
        TEdit *Show2;
        TEdit *ShowProduct;
        TLabel *Label4;
        TLabel *Label5;
        TLabel *Label6;
        TLabel *Label7;
        TButton *ShowButton;
        TButton *EnterInput1Button;
        TButton *EnterInput2Button1;
        TButton *MultiplyButton;
        void __fastcall EnterInput1ButtonClick(TObject *Sender);
private: // User declarations
int Input1;
int Input2;
int Product;
public: // User declarations
        __fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

ClassFirstU.cpp

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "ClassFirstU.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::EnterInput1ButtonClick(TObject *Sender)
{
Input1 = Input1Box ->Text.ToInt();
Show1->Text = Input1;
}

//---------------------------------------------------------------------------

ClassSecond.h

#define ClassSecondH
#include "ClassThird.h"
//---------------------------------------------------------------------------
class NumberBoardClass
{
  protected:
   NumberBoardType Board();
   NumberBoardType ShowOne();
   NumberBoardType Multiply(void);
  public:
   NumberBoardType Show();
};
#endif

ClassSecond.cpp

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "ClassSecond.h"

//---------------------------------------------------------------------------
NumberBoardType NumberBoardClass::Multiply(void)
{
int LocalNumber;
LocalNumber = NumberBoardType.Input1 * NumberBoardClass.Input2;
NumberBoardType.Product = LocalNumber;
return Board;
}
#pragma package(smart_init)

ClassThird.h

//---------------------------------------------------------------------------

#ifndef ClassThirdH
#define ClassThirdH
//---------------------------------------------------------------------------
struct NumberBoardType
  {
    int Input1;
    int Input2;
    int Product;
   };
#endif
RRRRRRRRRRRRRRR..
And the error messages I get are :-
[C++ Error] ClassSecond.cpp(12): E2108 Improper use of typedef
'NumberBoardType'

[C++ Error] ClassSecond.cpp(12): E2108 Improper use of typedef
'NumberBoardClass'

[C++ Error] ClassSecond.cpp(13): E2108 Improper use of typedef
'NumberBoardType'

[C++ Error] ClassSecond.cpp(14): E2235 Member function must be called
or its address taken

I really don't know what's wrong!

Michael Bell

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