FABSSection: Linux Programmer's Manual (3)
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NAMEfabs, fabsf, fabsl - absolute value of floating-point number
#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)):
DESCRIPTIONThe fabs() functions return the absolute value of the floating-point number x.
RETURN VALUEThese functions return the absolute value of x.
If x is a NaN, a NaN is returned.
If x is -0, +0 is returned.
ERRORSNo errors occur.
CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSOabs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)
COLOPHONThis page is part of release 3.21 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/.