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# Source file src/math/dim.go

```     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	// Dim returns the maximum of x-y or 0.
8	//
9	// Special cases are:
10	//	Dim(+Inf, +Inf) = NaN
11	//	Dim(-Inf, -Inf) = NaN
12	//	Dim(x, NaN) = Dim(NaN, x) = NaN
13	func Dim(x, y float64) float64
14
15	func dim(x, y float64) float64 {
16		return max(x-y, 0)
17	}
18
19	// Max returns the larger of x or y.
20	//
21	// Special cases are:
22	//	Max(x, +Inf) = Max(+Inf, x) = +Inf
23	//	Max(x, NaN) = Max(NaN, x) = NaN
24	//	Max(+0, ±0) = Max(±0, +0) = +0
25	//	Max(-0, -0) = -0
26	func Max(x, y float64) float64
27
28	func max(x, y float64) float64 {
29		// special cases
30		switch {
31		case IsInf(x, 1) || IsInf(y, 1):
32			return Inf(1)
33		case IsNaN(x) || IsNaN(y):
34			return NaN()
35		case x == 0 && x == y:
36			if Signbit(x) {
37				return y
38			}
39			return x
40		}
41		if x > y {
42			return x
43		}
44		return y
45	}
46
47	// Min returns the smaller of x or y.
48	//
49	// Special cases are:
50	//	Min(x, -Inf) = Min(-Inf, x) = -Inf
51	//	Min(x, NaN) = Min(NaN, x) = NaN
52	//	Min(-0, ±0) = Min(±0, -0) = -0
53	func Min(x, y float64) float64
54
55	func min(x, y float64) float64 {
56		// special cases
57		switch {
58		case IsInf(x, -1) || IsInf(y, -1):
59			return Inf(-1)
60		case IsNaN(x) || IsNaN(y):
61			return NaN()
62		case x == 0 && x == y:
63			if Signbit(x) {
64				return x
65			}
66			return y
67		}
68		if x < y {
69			return x
70		}
71		return y
72	}
73
```

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