blob: c40be417152f354d5021f2e436f8596511a307d3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
// Copyright 2009-2010 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
// Floor returns the greatest integer value less than or equal to x.
//
// Special cases are:
// Floor(±0) = ±0
// Floor(±Inf) = ±Inf
// Floor(NaN) = NaN
//extern floor
func libc_floor(float64) float64
func Floor(x float64) float64 {
return libc_floor(x)
}
func floor(x float64) float64 {
if x == 0 || IsNaN(x) || IsInf(x, 0) {
return x
}
if x < 0 {
d, fract := Modf(-x)
if fract != 0.0 {
d = d + 1
}
return -d
}
d, _ := Modf(x)
return d
}
// Ceil returns the least integer value greater than or equal to x.
//
// Special cases are:
// Ceil(±0) = ±0
// Ceil(±Inf) = ±Inf
// Ceil(NaN) = NaN
//extern ceil
func libc_ceil(float64) float64
func Ceil(x float64) float64 {
return libc_ceil(x)
}
func ceil(x float64) float64 {
return -Floor(-x)
}
// Trunc returns the integer value of x.
//
// Special cases are:
// Trunc(±0) = ±0
// Trunc(±Inf) = ±Inf
// Trunc(NaN) = NaN
func Trunc(x float64) float64 {
return trunc(x)
}
func trunc(x float64) float64 {
if x == 0 || IsNaN(x) || IsInf(x, 0) {
return x
}
d, _ := Modf(x)
return d
}
|
