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// Copyright 2009 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

// Abs returns the absolute value of x.

//

// Special cases are:

//      Abs(±Inf) = +Inf

//      Abs(NaN) = NaN

//extern fabs

func libc_fabs(float64) float64

func Abs(x float64) float64 {

        return libc_fabs(x)

}

func abs(x float64) float64 {

        switch {

        case x < 0:

                return -x

        case x == 0:

                return 0 // return correctly abs(-0)

        }

        return x

}