C / C++ / MFC

void CHashiDlg::On_AddSubtract_action() 
{
    CString strNumA;
            strNumB,
            strResult;
 
    m_num1.GetWindowText(strNumA);
    m_num2.GetWindowText(strNumB);
 
    double numA = atof(strNumA),
           numB = atof(strNumB);
 
    // check whether the mouse clicked right half
    if (m_two_actions_botn.OnRight())
        strResult.Format("%f", numA + numB);
    else
        strResult.Format("%f", numA - numB);
        
    m_results.SetWindowText(strResult);
}