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Source file src/math/mod.go

  // Copyright 2009-2010 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package math
  
  /*
  	Floating-point mod function.
  */
  
  // Mod returns the floating-point remainder of x/y.
  // The magnitude of the result is less than y and its
  // sign agrees with that of x.
  //
  // Special cases are:
  //	Mod(±Inf, y) = NaN
  //	Mod(NaN, y) = NaN
  //	Mod(x, 0) = NaN
  //	Mod(x, ±Inf) = x
  //	Mod(x, NaN) = NaN
  func Mod(x, y float64) float64
  
  func mod(x, y float64) float64 {
  	if y == 0 || IsInf(x, 0) || IsNaN(x) || IsNaN(y) {
  		return NaN()
  	}
  	if y < 0 {
  		y = -y
  	}
  
  	yfr, yexp := Frexp(y)
  	sign := false
  	r := x
  	if x < 0 {
  		r = -x
  		sign = true
  	}
  
  	for r >= y {
  		rfr, rexp := Frexp(r)
  		if rfr < yfr {
  			rexp = rexp - 1
  		}
  		r = r - Ldexp(y, rexp-yexp)
  	}
  	if sign {
  		r = -r
  	}
  	return r
  }
  

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