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#include <math.h> double fabs(double x); |
This function computes the absolute value of its argument x.
x if x is positive, else -x. Note that in this
context, +0.0 is positive and -0.0 is negative. Infinities and
NaN
s are returned unchanged, except for the sign.
ANSI/ISO C | C89; C99 |
POSIX | 1003.2-1992; 1003.1-2001 |
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