table of contents
FABS(3) | Linux Programmer's Manual | FABS(3) |
NAME¶
fabs, fabsf, fabsl - absolute value of floating-point number
SYNOPSIS¶
#include <math.h> double fabs(double x);
float fabsf(float x);
long double fabsl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fabsf(), fabsl():
or cc -std=c99
DESCRIPTION¶
These functions return the absolute value of the floating-point number x.
RETURN VALUE¶
These functions return the absolute value of x.
If x is a NaN, a NaN is returned.
If x is -0, +0 is returned.
If x is negative infinity or positive infinity, positive infinity is returned.
ERRORS¶
No errors occur.
ATTRIBUTES¶
Multithreading (see pthreads(7))¶
The fabs(), fabsf(), and fabsl() functions are thread-safe.
CONFORMING TO¶
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO¶
COLOPHON¶
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
2013-07-10 |