Show Progress in % problem

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Join Date: Mar 2008
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Lukezzz Lukezzz is offline Offline
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Show Progress in % problem

 
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  #1
Nov 26th, 2008
I am stuck in a problem where I should show a progress in % in a label. I have manage this code and think this should work but the label doesn´t update the % value it only shows "Progress... 0 %".
Is there anything I perheps should add to update the value in the label in realtime.
I have instead of:
Application:: DoEvents()

Also tried this without success.
C++ Syntax (Toggle Plain Text) 
  1. this->Update();
  2. this->ResumeLayout(true);

C++ Syntax (Toggle Plain Text) 
  1. //Show progress in %
  2. double ShowProgress = 0;
  3.  
  4.  for( int i = 0; i < 2231; ++i )
  5. {
  6. Thread::Sleep(10);
  7. ShowProgress = (i / 2231) * 100;
  8. label1->Text = "Progress... " + Convert::ToString(ShowProgress) + " %" ;
  9.  
  10. Application::DoEvents(); //Update Form
  11. }
Last edited by Lukezzz; Nov 26th, 2008 at 8:53 pm.
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grumpier grumpier is offline Offline
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Re: Show Progress in % problem

 
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  #2
Nov 26th, 2008
You are making the mistake of assuming that integer division yields a floating point result - it doesn't: it yields an integer result and integers can't represent fractions.

In your code i/2231 is an integer division, and yields an integer result by rounding towards zero (hence always yields zero if i is in the range [0,2231) ).

You need to force the division i/2231 to be a floating point division to get the result you expect. For example; 
ShowProgress = ((double)i / 2231) * 100;
or
ShowProgress = (i / 2231.0) * 100;
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Lukezzz Lukezzz is offline Offline
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Re: Show Progress in % problem

 
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  #3
Nov 26th, 2008
Yes, that was the problem

Thank you very much for your help.
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