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Sep 15th, 2006
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Basic doubt

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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:

C++ Syntax (Toggle Plain Text)
  1. void CCalculatorDlg::Oncalc() 
  2. {
  3. 	// TODO: Add your control notification handler code here
  4.  
  5. 	UpdateData(TRUE);
  6.  
  7. 	if ((m_amostras >= 1) && (m_elementos >= 1) && (m_click == true))
  8. 	{
  9. 		if (m_interno)
  10. 			m_total = (19.8522+(3.99038*(m_elementos-1))+((1.74579+((m_elementos-1)*0.1496))*(m_amostras-1))) + (2.5*m_preparacao);
  11. 		else if (m_externo)
  12. 		{
  13. 			if (m_amostras < 11)
  14. 				m_total = (19.9519+(19.9519*(m_elementos-1))+((19.9519+((m_elementos-1)*2.494))*(m_amostras-1)))+(5*m_preparacao);
  15.  
  16. 			if (m_amostras > 10)
  17. 				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);
  18. 		}
  19. 	}
  20. 	else
  21. 	{
  22. 		if ((m_amostras < 1) || (m_elementos < 1))	
  23. 			MessageBox("Tem que especificar pelo menos uma amostra e um elemento!");
  24.  
  25. 		if (!m_click)
  26. 			MessageBox("Tem que especificar o tipo de cliente!");
  27. 	}
  28.  
  29. 	UpdateData(FALSE);
  30.  
  31. }

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

Thanks
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Re: Basic doubt

Look in setprecision manipulator
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Re: Basic doubt

Click to Expand / Collapse  Quote 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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Re: Basic doubt

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


If you are not using MFC, then use standard C sprintf() function
C++ Syntax (Toggle Plain Text)
  1. char text[20];
  2. float number = 12.123456;
  3. sprintf(text,"%.2f", number);
  4. GetDialogItem(IDC_EDI1)->SetWindowText(text);
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Re: Basic doubt

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

C++ Syntax (Toggle Plain Text)
  1. --------------------Configuration: calculator - Win32 Release--------------------
  2. Compiling...
  3. calculatorDlg.cpp
  4. D:\vários\mail\calculator\calculatorDlg.cpp(201) : error C2065: 'GetDialogItem' : undeclared identifier
  5. D:\vários\mail\calculator\calculatorDlg.cpp(201) : error C2227: left of '->SetWindowTextA' must point to class/struct/union
  6. Error executing cl.exe.
  7.  
  8. calculator.exe - 2 error(s), 0 warning(s)

Can you figure out why?
thanks
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Re: Basic doubt

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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Re: Basic doubt

Click to Expand / Collapse  Quote 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.

Quote ...
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
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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.
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