C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
Floating-Point Absolute Value Functions
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <math.h>
 
  Syntax:    double fabs( double x );
             long double _fabsl( long double x );
 
  Returns:   the absolute value of its argument.
 
  See also:  abs, _cabs
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