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Man Pages
FABS(3) FreeBSD Library Functions Manual FABS(3)

fabs, fabsf, fabsl
floating-point absolute value functions

Math Library (libm, -lm)

#include <math.h>

double
fabs(double x);

float
fabsf(float x);

long double
fabsl(long double x);

The fabs(), fabsf() and fabsl() functions compute the absolute value of a floating-point number x.

The fabs(), fabsf() and fabsl() functions return the absolute value of x.

abs(3), ceil(3), floor(3), ieee(3), math(3), rint(3)

The fabs() function conforms to ISO/IEC 9899:1990 (“ISO C90”). The fabsf() and fabsl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
October 25, 2003 FreeBSD 13.1-RELEASE

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