fabs(3) Library Functions Manual fabs(3) NAME fabs, fabsf, fabsl - absolute value of floating-point number LIBRARY Math library (libm, -lm) SYNOPSIS #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 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 at- tributes(7). ┌────────────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├────────────────────────────────────────────┼───────────────┼─────────┤ │fabs(), fabsf(), fabsl() │ Thread safety │ MT-Safe │ └────────────────────────────────────────────┴───────────────┴─────────┘ STANDARDS C99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD. SEE ALSO abs(3), cabs(3), ceil(3), floor(3), labs(3), rint(3) Linux man-pages 6.03 2023-02-05 fabs(3)
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