blob: 03f8c5edcca8a8c71a4b076ebead6c347c827f48 (
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
72
73
74
75
76
77
78
79
80
81
82
83
|
//
// System.Random.cs
//
// Author:
// Bob Smith (bob@thestuff.net)
//
// (C) 2001 Bob Smith. http://www.thestuff.net
//
using System;
using System.Globalization;
namespace System
{
[Serializable]
public class Random
{
private int S = 1;
private const int A = 16807;
private const int M = 2147483647;
private const int Q = 127773;
private const int R = 2836;
public Random()
{
S = (int)(DateTime.Now.Ticks);
}
public Random(int Seed)
{
S = Seed;
}
public virtual int Next()
{
return (int)(this.Sample()*Int32.MaxValue);
}
public virtual int Next(int maxValue)
{
if (maxValue < 0)
throw new ArgumentOutOfRangeException(Locale.GetText (
"Max value is less then min value."));
else if (maxValue == 0)
return 0;
return (int)(this.Sample()*maxValue);
}
public virtual int Next(int minValue, int maxValue)
{
if (minValue > maxValue)
throw new ArgumentOutOfRangeException(Locale.GetText (
"Min value is greater then max value."));
else if (minValue == maxValue)
return minValue;
return (int)(this.Sample()*(maxValue - minValue))+minValue;
}
public virtual void NextBytes(byte[] buffer)
{
int i, l;
if (buffer == null)
throw new ArgumentNullException();
l = buffer.GetUpperBound(0);
for (i = buffer.GetLowerBound(0); i < l; i++)
{
buffer[i] = (byte)(this.Sample()*Byte.MaxValue);
}
}
public virtual double NextDouble ()
{
return this.Sample();
}
protected virtual double Sample ()
{
S = A*(S%Q)-R*(S/Q);
if (S < 0)
S+=M;
return S/(double)Int32.MaxValue;
}
}
}
|
