Actually I take that back, abs is in stdlib (for some reason...)
so you'll have to #include <stdlib.h>, no extra linking required.
On 4/16/05, Michael Barton <[EMAIL PROTECTED]> wrote:
> Or:
> variable = -variable;
> takes less cpu than multiplying by -1.
>
> If you use abs, you'll also have to add -lm to the L_FLAGS in your
> makefile (to link to the math library).
> Or you could just write your own...
> int my_abs(int a)
> {
> return (a < 0) ? -a : a;
> }
>
> On 4/16/05, Ammaross Danan <[EMAIL PROTECTED]> wrote:
> > Number * -1
> >
> > Or
> >
> > #include <math.h>
> > Number = abs(Number);
> >
> > Use the later if you always want it to be positive, the first could
> > potentially make it go negative if it was positive to begin with...
> >
> > Ammaross
> > www.rotf.net
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of cyhawk
> > Sent: Saturday, April 16, 2005 1:54 PM
> > To: [email protected]
> > Subject: Quick question on math in C
> >
> > Err how would i convert a negitive number to a positive number?
> > ie -5 to 5
> > or -754 to 754
> > in c?
> >
> > Google was no help cause i have no idea how to form the question ;) Thanks
> > =)
> > --
> > ROM mailing list
> > [email protected]
> > Unsubscribe here ->>> http://www.rom.org/cgi-bin/mailman/listinfo/rom
> >
> > --
> > ROM mailing list
> > [email protected]
> > Unsubscribe here ->>> http://www.rom.org/cgi-bin/mailman/listinfo/rom
> >
>
> On 4/16/05, Ammaross Danan <[EMAIL PROTECTED]> wrote:
> > Number * -1
> >
> > Or
> >
> > #include <math.h>
> > Number = abs(Number);
> >
> > Use the later if you always want it to be positive, the first could
> > potentially make it go negative if it was positive to begin with...
> >
> > Ammaross
> > www.rotf.net
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of cyhawk
> > Sent: Saturday, April 16, 2005 1:54 PM
> > To: [email protected]
> > Subject: Quick question on math in C
> >
> > Err how would i convert a negitive number to a positive number?
> > ie -5 to 5
> > or -754 to 754
> > in c?
> >
> > Google was no help cause i have no idea how to form the question ;) Thanks
> > =)
> > --
> > ROM mailing list
> > [email protected]
> > Unsubscribe here ->>> http://www.rom.org/cgi-bin/mailman/listinfo/rom
> >
> > --
> > ROM mailing list
> > [email protected]
> > Unsubscribe here ->>> http://www.rom.org/cgi-bin/mailman/listinfo/rom
> >
>
