一. 生成隨機(jī)數(shù)（可設(shè)定范圍）

使用C#自帶類System.Radom(int seed),來生成隨機(jī)數(shù)，
使用Guid.NewGuid().GetHashCode(),生成新的Guid，然后獲取它的Hash Code（int），作為種子放入System.Radom(int seed)使用。
種子作用是使每次生成的數(shù)字分布更加隨機(jī)。
所有的隨機(jī)數(shù)生成算法都是偽隨機(jī)數(shù)。

二. 使用for循環(huán)，循環(huán)生成隨機(jī)數(shù)，然后劃分范圍（概率分配），對落入不同范圍內(nèi)的隨機(jī)數(shù)進(jìn)行計數(shù)，最后計算出實際概率值。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static int randomNum;
        static int awards;
        static int a = 0;
        static int b = 0;
        static int c = 0;
        static int d = 0;
        static int e = 0;
        static int f = 0;
        static int g = 0;
        static int h = 0;
        static int ii = 0;
        static int j = 0;
        static int k = 0;
        static int l = 0;
        //添加整形變量為循環(huán)次數(shù)與概率分母，更改循環(huán)次數(shù)測試時，只要修改一個變量，即可得出正確概率
        static int Cnum = 10000;
        static void Main(string[] args)
        {   //循環(huán)次數(shù)更換為變量
            for (int i = 0; i < Cnum; i++)
            {

                string strprize = "";
                int payscore = 0;
                int itemid = 32;

                awards = new System.Random(Guid.NewGuid().GetHashCode()).Next(1, 1001);//抽獎概率隨機(jī)數(shù)
                if (awards < 2) //1等獎
                {
                    strprize = "1等獎";
                    payscore = 100;
                    a = a + 1;

                }
                else if (awards < 6)
                {
                    strprize = "2等獎";
                    payscore = 50;
                    b = b + 1;
                }
                else if (awards < 11)
                {
                    strprize = "3等獎";
                    payscore = 40;
                    c = c + 1;

                }
                else if (awards < 51)
                {
                    strprize = "4等獎";
                    payscore = 20;
                    d = d + 1;

                }
                else if (awards < 125)
                {
                    strprize = "5等獎";
                    payscore = 5;

                    e = e + 1;
                }
                else if (awards < 201)
                {
                    strprize = "6等獎";
                    payscore = 1;
                    itemid = 46;

                    f = f + 1;
                }
                else
                {

                    randomNum = new System.Random(Guid.NewGuid().GetHashCode()).Next(1, 7);

                    if (randomNum == 1)
                    {
                        strprize = "7等獎";
                        payscore = 0;

                        g = g + 1;
                    }
                    else if (randomNum == 2)
                    {
                        strprize = "7等獎";
                        payscore = 1;
                        itemid = 46;

                        h = h + 1;
                    }
                    else if (randomNum == 3)
                    {
                        strprize = "7等獎";
                        payscore = 0;
                        ii = ii + 1;

                    }
                    else if (randomNum == 4)
                    {
                        strprize = "7等獎";
                        payscore = 10;
                        j = j + 1;


                    }
                    else if (randomNum == 5)
                    {
                        strprize = "7等獎";
                        payscore = 1;
                        itemid = 47;
                        j = j + 1;

                    }
                    else if (randomNum == 6)
                    {
                        strprize = "7等獎";
                        payscore = 1;
                        itemid = 47;

                        j = j + 1;
                    }
                }


            }
            //隱式轉(zhuǎn)換時，要先把Cnum轉(zhuǎn)換成double類型,然后除法的結(jié)果才能隱式轉(zhuǎn)換為double
            double cnum = Convert.ToDouble(Cnum);

            Console.Write("1等獎:    " + (a / cnum).ToString("0.####%") +"    次數(shù)"+a+ "\n");
            Console.Write("2等獎:   " + (b / cnum).ToString("0.####%") + "    次數(shù)" + b + "\n");
            Console.Write("3等獎:   " + (c / cnum).ToString("0.####%") + "    次數(shù)" + c + "\n");
            Console.Write("4等獎:   " + (d / cnum).ToString("0.####%") + "    次數(shù)" + d + "\n");
            Console.Write("5等獎:    " + (e / cnum).ToString("0.####%") + "    次數(shù)" + e + "\n");
            Console.Write("6等獎:    " + (f / cnum).ToString("0.####%") + "    次數(shù)" + f + "\n");
            Console.Write("7等獎:    " + (g / cnum).ToString("0.####%") + "    次數(shù)" + g + "\n");
            Console.Write("7等獎:    " + (ii / cnum).ToString("0.####%") + "    次數(shù)" + ii + "\n");
            Console.Write("7等獎:   " + (h / cnum).ToString("0.####%") + "    次數(shù)" + h + "\n");
            Console.Write("7等獎:    " + (j / cnum).ToString("0.####%") + "    次數(shù)" + j + "\n");
            Console.ReadLine();
        }
    }
}