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Basic doubt

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Join Date: Mar 2006

Posts: 78

Reputation: gampalu is an unknown quantity at this point

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gampalu

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Junior Poster in Training

Basic doubt

Sep 15th, 2006

I'm doing a dialog application in C++ to calculate something, but I want the result to be with 2 decimal number, how to do this?

here is the function:

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 C++ Syntax (Toggle Plain Text) 
void CCalculatorDlg::Oncalc() 
{
	// TODO: Add your control notification handler code here
 
	UpdateData(TRUE);
 
	if ((m_amostras >= 1) && (m_elementos >= 1) && (m_click == true))
	{
		if (m_interno)
			m_total = (19.8522+(3.99038*(m_elementos-1))+((1.74579+((m_elementos-1)*0.1496))*(m_amostras-1))) + (2.5*m_preparacao);
		else if (m_externo)
		{
			if (m_amostras < 11)
				m_total = (19.9519+(19.9519*(m_elementos-1))+((19.9519+((m_elementos-1)*2.494))*(m_amostras-1)))+(5*m_preparacao);
 
			if (m_amostras > 10)
				m_total = (19.9519+(19.9519*(m_elementos-1))+(((19.9519+((m_elementos-1)*2.494))*(9))+((9.98+((m_elementos-1)*2.494))*(m_amostras-10))))+(5*m_preparacao);
		}
	}
	else
	{
		if ((m_amostras < 1) || (m_elementos < 1))	
			MessageBox("Tem que especificar pelo menos uma amostra e um elemento!");
 
		if (!m_click)
			MessageBox("Tem que especificar o tipo de cliente!");
	}
 
	UpdateData(FALSE);
 
}
void CCalculatorDlg::Oncalc() 
{
	// TODO: Add your control notification handler code here
	
	UpdateData(TRUE);
	
	if ((m_amostras >= 1) && (m_elementos >= 1) && (m_click == true))
	{
		if (m_interno)
			m_total = (19.8522+(3.99038*(m_elementos-1))+((1.74579+((m_elementos-1)*0.1496))*(m_amostras-1))) + (2.5*m_preparacao);
		else if (m_externo)
		{
			if (m_amostras < 11)
				m_total = (19.9519+(19.9519*(m_elementos-1))+((19.9519+((m_elementos-1)*2.494))*(m_amostras-1)))+(5*m_preparacao);
			
			if (m_amostras > 10)
				m_total = (19.9519+(19.9519*(m_elementos-1))+(((19.9519+((m_elementos-1)*2.494))*(9))+((9.98+((m_elementos-1)*2.494))*(m_amostras-10))))+(5*m_preparacao);
		}
	}
	else
	{
		if ((m_amostras < 1) || (m_elementos < 1))	
			MessageBox("Tem que especificar pelo menos uma amostra e um elemento!");
	
		if (!m_click)
			MessageBox("Tem que especificar o tipo de cliente!");
	}
	
	UpdateData(FALSE);
	
}

I want the variable m_total to show with 2 decimal numbers, like, p.e. x,yz.

Thanks

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Join Date: Jul 2006

Posts: 147

Reputation: Grunt has a spectacular aura about

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Grunt

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Re: Basic doubt

Sep 15th, 2006

Look in setprecision manipulator

The key to eliminating bugs from your code is learning from your mistakes.

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Join Date: Mar 2006

Posts: 78

Reputation: gampalu is an unknown quantity at this point

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gampalu

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Junior Poster in Training

Re: Basic doubt

Sep 15th, 2006

•

Originally Posted by Grunt

Look in setprecision manipulator

But I'm not using cout... The variable m_total is shown at the dialog box in an edit box...

Last edited by gampalu; Sep 15th, 2006 at 8:13 am.

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Join Date: Aug 2005

Posts: 15,358

Reputation: Ancient Dragon has a reputation beyond repute

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Ancient Dragon Ancient Dragon is offline

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Still Learning

Re: Basic doubt

Sep 15th, 2006

you will have to format the string before it is displayed in the dialog box. If you are using MFC, then use CString's Format() method, for exaple

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 C++ Syntax (Toggle Plain Text) 
CString text;
float number = 12.123456;
text.Format("%.2f", number);
GetDialogItem(IDC_EDI1)->SetWindowText(text);
CString text;
float number = 12.123456;
text.Format("%.2f", number);
GetDialogItem(IDC_EDI1)->SetWindowText(text);

If you are not using MFC, then use standard C sprintf() function

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
char text[20];
float number = 12.123456;
sprintf(text,"%.2f", number);
GetDialogItem(IDC_EDI1)->SetWindowText(text);
char text[20];
float number = 12.123456;
sprintf(text,"%.2f", number);
GetDialogItem(IDC_EDI1)->SetWindowText(text);

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Join Date: Mar 2006

Posts: 78

Reputation: gampalu is an unknown quantity at this point

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gampalu

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Junior Poster in Training

Re: Basic doubt

Sep 15th, 2006

I'm using MFC and I tried your exmeple but I get this:

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--------------------Configuration: calculator - Win32 Release--------------------
Compiling...
calculatorDlg.cpp
D:\vários\mail\calculator\calculatorDlg.cpp(201) : error C2065: 'GetDialogItem' : undeclared identifier
D:\vários\mail\calculator\calculatorDlg.cpp(201) : error C2227: left of '->SetWindowTextA' must point to class/struct/union
Error executing cl.exe.
 
calculator.exe - 2 error(s), 0 warning(s)
--------------------Configuration: calculator - Win32 Release--------------------
Compiling...
calculatorDlg.cpp
D:\vários\mail\calculator\calculatorDlg.cpp(201) : error C2065: 'GetDialogItem' : undeclared identifier
D:\vários\mail\calculator\calculatorDlg.cpp(201) : error C2227: left of '->SetWindowTextA' must point to class/struct/union
Error executing cl.exe.

calculator.exe - 2 error(s), 0 warning(s)

Can you figure out why?
thanks

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Join Date: Aug 2005

Posts: 15,358

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Ancient Dragon Ancient Dragon is offline

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Still Learning

Re: Basic doubt

Sep 15th, 2006

Sorry about the mistake. Should have been GetDlgItem

Alternatively, if you used ClassWizard to assign a CString variable to the edit control, then you don't need to call GetDlgItem() but use that variable instead, then call UpdateData(FALSE) to update the edit control.

If you are new to MFC and you are using VC++ 6.0 compiler you might want to read the Microsoft Scribble tutorial, which will show you how to do all that neat stuff.

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Join Date: Mar 2006

Posts: 78

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gampalu

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Junior Poster in Training

Re: Basic doubt

Sep 15th, 2006

•

Originally Posted by Ancient Dragon

Sorry about the mistake. Should have been GetDlgItem

Alternatively, if you used ClassWizard to assign a CString variable to the edit control, then you don't need to call GetDlgItem() but use that variable instead, then call UpdateData(FALSE) to update the edit control.

I've used the alternative you gave me and it works

thanks for your attention.

•

If you are new to MFC and you are using VC++ 6.0 compiler you might want to read the Microsoft Scribble tutorial, which will show you how to do all that neat stuff.

This link it's in my bookmarks :cheesy:
thanks again