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fabs

Syntax

 
#include <math.h>

double fabs(double x);

Description

This function computes the absolute value of its argument x.

Return Value

x if x is positive, else -x. Note that in this context, +0.0 is positive and -0.0 is negative. Infinities and NaNs are returned unchanged, except for the sign.

Portability

ANSI/ISO C C89; C99
POSIX 1003.2-1992; 1003.1-2001


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