Date: Fri, 28 Nov 2003 16:01:33 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: freebsd-standards@freebsd.org Subject: Implementing C99's roundf(), round(), and roundl() Message-ID: <20031129000133.GA30662@troutmask.apl.washington.edu>
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Can the math functions round[fl]() be implemented in
terms of other math(3) functions and still conform to the
C99 and POSIX standard? For example,
#include <math.h>
float roundf(float x) {
float t;
if (x >= 0.0) {
t = ceilf(x);
if ((t - x) > 0.5) t -= 1.0;
return t;
} else {
t = ceilf(-x);
if ((t + x) > 0.5) t -= 1.0;
return -t;
}
}
--
Steve
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