C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
fmod, _fmodl
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <math.h>
 
  Syntax:    double fmod( double x, double y );
             long double _fmodl( long double x, long double y );
 
  Returns:   the floating-point remainder, or 0 if <y> is 0.
 
  See also:  modf, ceil, floor, fabs
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