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  1. @c ----------------------------------------------------------------------
  2. @node fabs, math
  3. @subheading Syntax
  4.  
  5. @example
  6. #include <math.h>
  7.  
  8. double fabs(double x);
  9. @end example
  10.  
  11. @subheading Return Value
  12.  
  13. @var{x} if @var{x} is positive, else -@var{x}.  Note that in this
  14. context, +0.0 is positive and -0.0 is negative.
  15.