fabs (3)
NAME
fabs, fabsf, fabsl - absolute value of floating-point numberSYNOPSIS
#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():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
fabs (), fabsf (), fabsl () | Thread safety | MT-Safe |