How to count CPU time by using C function

[PCHOME]

Hi!

I am new to C.
If I want to know the CPU time needed to run a sequence of my C
code(not necessary the whole program, maybe just part of my program),

What function should I use? Some example?

Thanks!

 

[Keith Thompson]

I am new to C.
If I want to know the CPU time needed to run a sequence of my C
code(not necessary the whole program, maybe just part of my program),

What function should I use? Some example?

Standard C provides the clock() function for this purpose. Your
system, or any C textbook, should include documentation on it.

Save the value returned by clock() before and after the code executes,
subtract the former from the latter, and divide by CLOCKS_PER_SEC to
get seconds.

There may be system-specific functions that provide similar
functionality, perhaps in more detail. (You might find the times()
function useful if your system provides it, but if you have any
questions about it, you'll need to ask in a system-specific
newsgroup.)