FABS(3) 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.

Functions of the fabs() family return the absolute value of x.

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

The fabs() function conforms to ANSI X3.159-1989 (“ANSI C89”). The fabsf() and fabsl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
March 17, 2016 NetBSD 9.2