我在窗体上有一个按钮，一个edit，要求按一下按钮，edit上显示出"AAA"，用一个函数实现，请问在头文件中和cpp文件中应该怎么做？？
函数是
void ShowAAA()
{
edit->text="AAA";
}

上面这段代码声明应该放在哪里，实现放在哪里？？


//unit1.cpp文件代码-------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TMainForm *MainForm;
//---------------------------------------------------------------------------
__fastcall TMainForm::TMainForm(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TMainForm::btnSunClick(TObject *Sender)
{

}
//---------------------------------------------------------------------------

//--------------------------------------------------------------------
unit1.h文件代码

class TMainForm : public TForm
{
__published:    // IDE-managed Components
        TButton *btnSun;
        TEdit *txt1;
        void __fastcall btnSunClick(TObject *Sender);
private:    // User declarations
public:        // User declarations
        __fastcall TMainForm(TComponent* Owner);

};
//---------------------------------------------------------------------------
extern PACKAGE TMainForm *MainForm;
//---------------------------------------------------------------------------
#endif

void __fastcall TMainForm::btnSunClick(TObject *Sender)
{
    edit->text="AAA";
}

另外，你的帖子应该发在C++ Builder块里。