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# Source file src/math/nextafter.go

## Documentation: math

```     1  // Copyright 2010 The Go Authors. All rights reserved.
2  // Use of this source code is governed by a BSD-style
4
5  package math
6
7  // Nextafter32 returns the next representable float32 value after x towards y.
8  //
9  // Special cases are:
10  //	Nextafter32(x, x)   = x
11  //	Nextafter32(NaN, y) = NaN
12  //	Nextafter32(x, NaN) = NaN
13  func Nextafter32(x, y float32) (r float32) {
14  	switch {
15  	case IsNaN(float64(x)) || IsNaN(float64(y)): // special case
16  		r = float32(NaN())
17  	case x == y:
18  		r = x
19  	case x == 0:
20  		r = float32(Copysign(float64(Float32frombits(1)), float64(y)))
21  	case (y > x) == (x > 0):
22  		r = Float32frombits(Float32bits(x) + 1)
23  	default:
24  		r = Float32frombits(Float32bits(x) - 1)
25  	}
26  	return
27  }
28
29  // Nextafter returns the next representable float64 value after x towards y.
30  //
31  // Special cases are:
32  //	Nextafter(x, x)   = x
33  //	Nextafter(NaN, y) = NaN
34  //	Nextafter(x, NaN) = NaN
35  func Nextafter(x, y float64) (r float64) {
36  	switch {
37  	case IsNaN(x) || IsNaN(y): // special case
38  		r = NaN()
39  	case x == y:
40  		r = x
41  	case x == 0:
42  		r = Copysign(Float64frombits(1), y)
43  	case (y > x) == (x > 0):
44  		r = Float64frombits(Float64bits(x) + 1)
45  	default:
46  		r = Float64frombits(Float64bits(x) - 1)
47  	}
48  	return
49  }
50
```

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