NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO |
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fabs(3) Library Functions Manual fabs(3)
fabs, fabsf, fabsl - absolute value of floating-point number
Math library (libm, -lm)
#include <math.h> double fabs(double x); float fabsf(float x); long double fabsl(long double x); 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 <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the absolute value of the floating-point number x.
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.
No errors occur.
For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │fabs(), fabsf(), fabsl() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3)
Linux man-pages 6.04 2023-03-30 fabs(3)
Pages that refer to this page: abs(3)