randomnumbergenerator.cs

Data Structures and Algorithms with Object-Oriented Design Patterns in C# 这本书的范例代码dll自己反编译的source

namespace Opus6
{
    using System;

    [Version("$Id: RandomNumberGenerator.cs,v 1.3 2001/09/11 12:04:04 brpreiss Exp $"), Copyright("Copyright (c) 2001 by Bruno R. Preiss, P.Eng.")]
    public sealed class RandomNumberGenerator
    {
        static RandomNumberGenerator()
        {
            RandomNumberGenerator.seed = 1;
        }

        private RandomNumberGenerator()
        {
        }


        public static double Next
        {
            get
            {
                RandomNumberGenerator.seed = (0x41a7 * (RandomNumberGenerator.seed % 0x1f31d)) - (0xb14 * (RandomNumberGenerator.seed / 0x1f31d));
                if (RandomNumberGenerator.seed < 0)
                {
                    RandomNumberGenerator.seed += 0x7fffffff;
                }
                return (((double) RandomNumberGenerator.seed) / 2147483647);
            }
        }

        public static int Seed
        {
            get
            {
                return RandomNumberGenerator.seed;
            }
            set
            {
                if ((value < 1) || (value >= 0x7fffffff))
                {
                    throw new ArgumentException("invalid seed");
                }
                RandomNumberGenerator.seed = value;
            }
        }


        private const int a = 0x41a7;
        private const int m = 0x7fffffff;
        private const int q = 0x1f31d;
        private const int r = 0xb14;
        private static int seed;
    }
}