Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

c++ clock() function problem in windows

Posted on 2009-04-01
2
Medium Priority
?
1,431 Views
Last Modified: 2013-12-14
I want to use clock() to get time.
But the code below

while (1)
printf("clock: %d\n", clock());

get the results like:

100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
116
I think it should get sth like 8,9,10,11...or 8,8,8,9,9,9,10,10....
while (1)
printf("clock: %d\n", clock());

Open in new window

0
Comment
Question by:rxzang
2 Comments
 
LVL 5

Accepted Solution

by:
rendaduiyan earned 1000 total points
ID: 24046635
clock is not so accurate. please refer to http://technology.chtsai.org/w98timer/.
0
 
LVL 39

Assisted Solution

by:itsmeandnobodyelse
itsmeandnobodyelse earned 1000 total points
ID: 24049197
rendaduiyan is right. clock only would be actualized any 15/16 milliseconds even on Windows Versions younger than W98.  

You would need to use QueryPerfomanceCounter to get better results. Or for emasuring performance you would need to repeat the measured action - say 1 million of times - to get useable times for comparing.

0

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Programmer's Notepad is, one of the best free text editing tools available, simply because the developers appear to have second-guessed every weird problem or issue a programmer is likely to run into. One of these problems is selecting and deleti…
How to install Selenium IDE and loops for quick automated testing. Get Selenium IDE from http://seleniumhq.org Go to that link and select download selenium in the right hand column That will then direct you to their download page. From that p…
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
The viewer will learn how to use and create keystrokes in Netbeans IDE 8.0 for Windows.

577 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question