CString str1,str, str2;

    GetDlgItemText(IDC_EDIT1, str1);

    GetDlgItemText(IDC_EDIT2, str2);

    UINT value3 = _ttoi(str2);

    if (  == value3)

    {

        return;

    }

    double value1 = _ttof(str1);

    double value2 = _ttof(str2);

    double value = value1 / value2;

    str.Format(_T("%.3f"), value);

    GetDlgItem(IDC_STATIC_VALUE)->SetWindowText(str);