Making a Calculator and converting data types and displaying them in edit controls

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C++

MFC

dialog

convert

GUI

Hello The Code Project Community,

I'm new to writing code for Visual C++ GUI's. I'm trying to make an application to convert Horsepower to Kilowatts and vise versa.

I am able to convert it when I instantiate horsePower into a random number like 300 (double horsePower = 300.0) but what I wanted is that when I press the button.. it would take the value in the edit control box and convert that and display it into the results box. Picture provided below.

I had many errors beforehand experimenting from what I searched online and it included converting double into CStrings and vice versa and LPCTSTR and whatnot.

Help would be appreciated.

void CTry_4Dlg::OnBnClickedButton1()
{
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	double horsePower = 0.0;
	CString hP;							
	horsePower = horsePower * 0.745699872;	// conversion to kilowatts
	hP.Format(_T("%f"),horsePower);
	m_inputVariable.SetWindowText(hP);
	UpdateData(false);
}

void CTry_4Dlg::OnBnClickedButton3()
{
    // TODO: Add your control notification handler code here
    UpdateData(true);
    double kiloWatts = 0;                  // initialize kiloWatts
    CString kW;                             
    kiloWatts = kiloWatts * 1.34102209;     // conversion to horsepower
    kW.Format(_T("%f"),kiloWatts);
    m_inputVariable.SetWindowText(kW);
    UpdateData(false);
}

}