Get Two Input in Single Edit Box in Calculator Program

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VC6

VC7.0

C++

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VisualC++

Hi Everyone,

How to get two input in a single Edit Box in VC++ in Visual Studio 2005
Its like getting an input from Edit Box(Divident) and second input(Divisor) in single Function.I have written a code which is not working i have tried many ways......

void CCalciDlg::OnBnClickedCbuttondiv()
{
    double a,b;
    resu.SetFocus();
    UpdateData(TRUE);
    a=num1;      //num1 is the Edit Box Resource
    resu.SetFocus();
    a=num;
    UpdateData(TRUE);
    resu.SetFocus();
    b=num1;
    num=a/b;
    
}

This Code Taking Both a and b as the same......