C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
ceil, _ceill, floor, _floorl
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <math.h>
 
  Syntax:    double ceil( double x );
             double floor( double x );
             long double _ceill( long double x );
             long double _floorl( long double x );
 
  Returns:   (ceil) the double result rounded up.
             (floor) the double result rounded down.
             (_ceill) the long double result rounded up.
             (_floorl) the long double result rounded down.
 
  See also:  fmod
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