#include "afxwin.h" #include "SimpleDialog.h" CSimpleDialog::CSimpleDialog() : CDialog("Addition") { m_nTotal = 0; } afx_msg void CSimpleDialog::OnAdd() { } afx_msg void CSimpleDialog::OnClear() { } BEGIN_MESSAGE_MAP(CSimpleDialog, CDialog) ON_COMMAND(IDC_ADD, OnAdd) ON_COMMAND(IDC_CLEAR, OnClear) END_MESSAGE_MAP() class CAdditionExample : public CWinApp { public: BOOL InitInstance() { CSimpleDialog additionDialog; additionDialog.DoModal(); return TRUE; } }; CAdditionExample addition_example;