C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
modf, _modfl
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <math.h>
 
  Syntax:    double modf( double x, double *intptr );
             long double _modfl( long double x, long double *intptr );
 
  Returns:   the signed fractional portion of <x>.
 
  See also:  frexp, ldexp, fmod, fabs
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