SIMPLE SOLUTIONS

FABS(3) - Linux man page online | Library functions

Absolute value of floating-point number.

Chapter
2017-09-15
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(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* 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 │ └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)

COLOPHON

This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
2017-09-15 FABS(3)
This manual Reference Other manuals
fabs(3) referred by abs(3)
refer to abs(3) | attributes(7) | cabs(3) | ceil(3) | feature_test_macros(7) | floor(3) | rint(3)
Download raw manual
Main page Linux Programmer's Manual (+2508) № 3 (+68044)
Go top