C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_matherr, _matherrl
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <math.h>
 
  Syntax:    int _matherr( struct _exception *except );
             int _matherrl( struct _exceptionl *except );
 
  Returns:   a nonzero value if successful, or 0 if not.
 
  See also:  cos, acos, cosh, bessel, _cabs, exp, _hypot, log, pow, sqrt
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