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 } 23
