warning: implicit declaration

doggiedoc

I'm not sure how to correct this warning.

HB25.c:54:5: warning: implicit declaration of function 'abs' [-Wimplicit-function-declaration]

As an exercise I am converting HB25.spin for SimpleIDE and wanted to set compile option to C99 to allow inline declarations, see this thread. But in the process, the code now generates the above warning where I try to use the absolute value function. Do I need a header declaration to resolve this warning? On a guess a tried adding #include <math.h> but that was not it. Here's the code snippet.

void Pause(int Duration) {
    int ClkCycles = (abs(Duration) * (CLKFREQ / 1000000) - 1050);
    waitcnt(ClkCycles + CNT);
}  

Thanks!
Paul

doggiedoc

BTW - here is the spin method I am converting:

PUB Pause(Duration) | ClkCycles
    ClkCycles := ||Duration * (clkfreq / 1_000_000) - 1050
    waitcnt(ClkCycles + cnt)

kuroneko

abs() is usually defined in stdlib.h. HTH

doggiedoc

kuroneko wrote: »

abs() is usually defined in stdlib.h. HTH

That fixed it! Thanks!!

jazzed

Recently found a jewel on the net http://pubs.opengroup.org/onlinepubs/009695399/functions/abs.html
It's a jewel because they have gone an extra step in completeness and also examples in several pages.

If you have a library function name and need a page on it, replace abs in the link with the function. I.E.
http://pubs.opengroup.org/onlinepubs/009695399/functions/strtod.html

Other sites provide something similar:

http://www.manpagez.com/man/3/strtod/
http://linux.die.net/man/3/strtod

Having an AJAX or other web script that makes these URLs would be great.

doggiedoc

Thanks! Those links will be very helpful!

Batang

jazzed: Having an AJAX or other web script that makes these URLs would be great.

Hi Steve, here is a quick and dirty C function browser, just type in the C function keyword and click go or hit enter.

It needs DotNet 2.0 to run.

Cheers

jazzed

Batang wrote: »

Hi Steve, here is a quick and dirty C function browser, just type in the C function keyword and click go or hit enter.

It needs DotNet 2.0 to run.

Cheers

Very nice work. Mac and Linux folks are out of luck though without using mono.

A google app would be easy to integrate at parallax.propellergcc.com ... guess I have to look at that more. Are google apps limited to chrome users?