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c++ clock() function problem in windows

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());

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0
rxzang
Asked:
rxzang
2 Solutions
 
rendaduiyanCommented:
clock is not so accurate. please refer to http://technology.chtsai.org/w98timer/.
0
 
itsmeandnobodyelseCommented:
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
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