What do u want to say! [modifed]

[codeadair]

I write a code as follow to detect the timer event(System.timers.timer). timer1.interval=100 timer1.AutoReset=Ture timer1.enable=false 'My test code Imports vb = Microsoft.VisualBasic 'above all codes Dim startime As Single Dim sresult() As Single = New Single(10000) {} 'record each start time Dim i As Integer Dim j As Integer Private Sub Timer1_Elapsed(ByVal sender As System.Object, ByVal e As System.Timers.ElapsedEventArgs) Handles Timer1.Elapsed sresult(i) = vb.Timer i += 1 End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Timer1.Enabled = True End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Timer1.Enabled = False End Sub Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click j += 1 TextBox3.Text = sresult(j) - sresult(j - 1) End Sub OK! What do u think it will be in textbox3?(After the second click) Wait for a minute to go on pls.Just say what do you think the answer now. OK! Come on,Everybody.Have you done it in your project? What is the result? And What i can see is: The number 0.09375 and 0.109375 displays alternatly. Why isn't it always 0.1 ? What is the number 0.09375 or 0.109375? And when i set timer1.interval=10 the alternate number is :"0" and 0.015625 Thank you for all ICQ:258-235-734 MSN:msnadair@hotmail.com -- modified at 5:03 Saturday 20th May, 2006

[MohammadAmiry]

Timer control (and Timer API) are not exact when are set to operate in small fractions of second... This just gives a relatively period near the interval you set. It is also affected by cpu usage... If you exactly want a sharp timer (for example if you are writing a media player program, to match audio and video you need it), search internet for High Resolution Timer. If you run a media player while you are testing your timer program, you get more accurate results (this is not an experience of mine, but one of my friends once had tested...)

[Colin Angus Mackay]

codeadair wrote:

OK! What do u think it will be in textbox3?(After the second click) Wait for a minute to go on pls.Just say what do you think the answer now.

Based on a timer interval of 100 ms I would expect the answer to be around about 0.1 If it is exactly 0.1 then you got lucky.

codeadair wrote:

OK! Come on,Everybody.Have you done it in your project? What is the result?

I've used timers in projects before. I also read the documentation on them first which said that they are not exact.

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"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." --Charles Babbage (1791-1871) My: Website | Blog

[codeadair]

Don't you think it is very interesting? It displays the two numbers alternantly every time when you run the program.

MohammadAmiry wrote:

Timer control (and Timer API) are not exact when are set to operate in small fractions of second... This just gives a relatively period near the interval you set

As you say,It may be 0.1 more or less Instead of regular alternate number 0.09375 and 0.109375. ICQ:258-235-734 MSN:msnadair@hotmail.com