A Clock in C

[WernerSchwarz]

Does anyone know how to make a for-loop that goes 1 Second no more, no less?

an idea:
for (x=0;x<10000;x++)
{
}

This should make the program wait a little while and then continue but i don't know what for a number i need for one Second.

 

[Salem]

Well depending on your Operating system and compiler, try one of

// in unix and other POSIX operating systems
sleep( 1 );

// in win32
Sleep( 1000 );

 

[mrscary]

You can't do it using a for loop - because then it would depend on the speed on the PC - hence in the early 90s all the games that no-one could play as PC speeds took off.
You will need to use a while loop - and check the system time - waiting till 1second is over.

#include <time.h>

time_t tmTimeNow;
time(&tmTimeNow);

time_t tmTimeLater;

do
{
time(&tmTimeLater);
} while (tmTimeLater <= tmTimeNow + 1);

M.





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http://www.hollingside.com

 

[WernerSchwarz]

Thanks for the quick answers, i hope they work fine.

 

[WernerSchwarz]

Is there a possible solution without the &quot;time.h&quot;?

 

[mrscary]

Possibly - what platform are you on?
time.h is part of the ansi standard though.

Hollingside Technologies, Making Technology work for you.

http://www.hollingside.com

 

[WernerSchwarz]

GBA (Gameboy Advanced) it has a RISC processor from ARM

 

[Salem]

Then I would suggest that you look inside whatever header files you have since it seems that you have neither an ANSI nor POSIX interface.

Does the GBA have any kind of operating system? A delay function of some sort is usually provided.

> for (x=0;x<10000;x++);
Will work, but you have to figure out the limit by trial and error. Also, its a good idea to make 'volatile int x;' just in case the optimiser decides that the loop does nothing and removes it.