github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/math/abs.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package math
     6  
     7  // Abs returns the absolute value of x.
     8  //
     9  // Special cases are:
    10  //	Abs(±Inf) = +Inf
    11  //	Abs(NaN) = NaN
    12  func Abs(x float64) float64
    13  
    14  func abs(x float64) float64 {
    15  	switch {
    16  	case x < 0:
    17  		return -x
    18  	case x == 0:
    19  		return 0 // return correctly abs(-0)
    20  	}
    21  	return x
    22  }