C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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Integer Absolute Value Functions
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <stdlib.h>    Required only for function declarations;
             <math.h>      use either STDLIB.H or MATH.H
 
  Syntax:    int abs( int n );
             long labs( long n );
 
  Returns:   the absolute value of its argument.
 
  See also:  fabs, _cabs
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