C#模拟红包功能，三种算法
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp5
{
class Program
{
static void Main(string[] args)
{
#region 红包算法⼀
Console.WriteLine("-----------------------------------红包算法⼀---------------------");
//初始化要发起的红包基础数据
double total = 100;
int num = 50;
double min = 0.01;
string temp;
bool flag = false;
Console.WriteLine(string.Format("是否需要⾃定义红包⾦额和数量（默认{0}元/{1}⼈）Y/N：", total, num));
temp = Console.ReadLine();
if (temp.Trim().ToLower().Equals("y") || temp.Trim().ToLower().Equals("yes"))
{
Console.WriteLine("请输⼊你要发起的红包⾦额：");
do
{
temp = Console.ReadLine();
flag = double.TryParse(temp, out total);
if (!flag)
{
Console.WriteLine("⾦额必须为整数或⼩数，请重新输⼊：");
}
} while (!flag);
Console.WriteLine("请输⼊你要发起的红包个数：");
do
{
temp = Console.ReadLine();
flag = int.TryParse(temp, out num);
if (!flag)
{
Console.WriteLine("红包个数必须为整数，请重新输⼊：");
}
} while (!flag);
}
total -= min * num;
if (total < 0)
{
Console.WriteLine("抱歉，你的⾦额不⾜！");
return;
}
//产⽣正态分布的随机红包⾦额，并计算相关的⾦额和数量保证数据的准确性
double average = total / num;
double variance = 1;
Random u1 = new Random();
Random u2 = new Random();
double[] nums = new double[num];
for (int i = 0; i < num; i++)
{
{
double? result = total;
if (i < num - 1 && total > 0)
{
do
{
result = Round((double)Normal(u1.NextDouble(), u2.NextDouble(), average, variance), 2);
} while (result == null || result < 0);
if (total > result)
{
total = (double)Round((total - (double)result), 2);
}
else
{
result = total;
total = 0;
}
}
else if (i == num - 1)
{
total = 0;
}
nums[i] = Math.Round(min + (double)result, 2); //浮点运算问题，这⾥需要四舍五⼊数据才正确
Console.WriteLine(string.Format("第{0}个红包⾦额：{1}", i + 1, (min + result)));
Console.WriteLine("剩余⾦额：" + ((i != num - 1 && total == 0) ? min * (num - i - 1) : total + (min * (num - i - 1)))); }
Console.WriteLine("最⼤⾦额：" + nums.Max());
Console.WriteLine("最⼩⾦额：" + nums.Min());
Console.WriteLine("总额：" + Round(nums.Sum(), 2));
Console.WriteLine("初始⽅差：" + variance);
Console.WriteLine("结果⽅差：" + Variance(nums));
Console.WriteLine("按任意键继续");
Console.ReadKey();
#endregion
#region 红包算法⼆
Console.WriteLine("-----------------------------------红包算法⼆---------------------");
RedPackage pp = new RedPackage();
int packageNum = 15;
var list = GetMoneys(pp);
Console.WriteLine("总⾦额 {0}", list.Sum());
#endregion
Console.ReadKey();
}
#region 算法⼀
/// <summary>
/// 产⽣符合正态分布的随机数
/// </summary>
/// <param name="u1">正态分布第⼀个随机数</param>
/// <param name="u2">正态分布第⼆个随机数</param>
/// <param name="averageValue">正态期望(平均值)</param>
/
// <param name="variance">正态标准差(Math.Sqrt(⽅差))</param>
/// <returns></returns>
public static double? Normal(double u1, double u2, double averageValue, double variance)
{
double? result = null;
try
{
result = averageValue + Math.Sqrt(variance) * Math.Sqrt((-2) * Math.Log(u1)) * Math.Sin(2 * Math.PI * u2);
}
catch (Exception)
catch (Exception)
{
result = null;
}
return result;
}
/// <summary>
/// 求⼀组数据的⽅差
/// </summary>
/// <param name="list">要求的数组</param>
/// <returns></returns>
writeline方法的作用public static double Variance(double[] nums)
{
double average = nums.Sum() / nums.Length;
double sum = 0;
double variance = 0;
foreach (double num in nums)
{
sum += Math.Pow((num - average), 2);
}
variance = sum / nums.Length;
return variance;
}
/
// <summary>
/// 截取⼩数指定⼩数位，且不四舍五⼊
/// </summary>
/// <param name="originNum">要截取的⼩数</param>
/// <param name="lastNum">截取⼩数后位数</param>
/// <returns></returns>
public static double? Round(double originNum, int lastNum)
{
double? result = null;
int index = originNum.ToString().IndexOf('.');
if (index != -1)
{
string temp = originNum.ToString();
result = Convert.ToDouble(temp.Substring(0, index + 1) + temp.Substring(index + 1, Math.Min(temp.Length - index - 1, lastNum))); }
if (result == 0)
{
result = null;
}
else if (index == -1)
{
result = originNum;
}
return result;
}
#endregion
#region 算法⼆
/// 红包算法
/// </summary>
/// <param name="_redPacket"></param>
/// <returns></returns>
public static List<double> GetMoneys(RedPackage _redPacket)
{
//⼈均最⼩⾦额
double min = 0.01;
if (_ainMoney < _ainCount * min)
if (_ainMoney < _ainCount * min)
return null;
int num = _ainCount;
List<double> array = new List<double>();
Random r = new Random();
for (int i = 0; i < num; i++)
{
if (_ainCount == 1)
{
_ainCount--;
array.Add(Convert.ToDouble(_ainMoney.ToString("0.00")));
Console.WriteLine(string.Format("第{0}个红包：{1}元", i + 1, Convert.ToDouble(_ainMoney.ToString("0.0")))); }
else
{
//(_ainMoney - (_ainCount - 1) * min)：保存剩余⾦额可以⾜够的去分配剩余的红包数量
double max = (_ainMoney - (_ainCount - 1) * min) / _ainCount * 2;
double money = r.NextDouble() * max;
money = Convert.ToDouble((money <= min ? min : money).ToString("0.00"));
_ainCount--;
_ainMoney -= money;
array.Add(money);
Console.WriteLine(string.Format("第{0}个红包：{1}元", i + 1, money));
}
}
//再次随机
return array.OrderBy(o => Guid.NewGuid()).ToList();
}
public class RedPackage
{
/
// <summary>
/// 剩余的红包数量
/// </summary>
public int remainCount { set; get; }
/// <summary>
/// 剩余⾦额
/// </summary>
public double remainMoney { set; get; }
}
#endregion
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp5
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("---------------红包算法三按排名从多⼤⼩--------------");
RedPackage pp = new RedPackage();
var list = GetMoneys(pp);
Console.WriteLine("总⾦额 {0}", list.Sum());
Console.ReadKey();
}
public static List<double> GetMoneys(RedPackage _redPackage)
{
double totalMoney = _ainMoney;
int num = _ainCount;
List<double> list = new List<double>();
List<int> rankList = new List<int>();
#region 获取所有排名
for (int i = 0; i < num; i++)
{
int rank = num - i; //从后往前排名
rankList.Add(rank);
}
#endregion
int k = rankList.Sum();
for (int i = 0; i < num; i++)
{
var p = Math.Round((double)(rankList[i]) / k, 6, MidpointRounding.ToEven); double money = Math.Round(totalMoney * p, 2, MidpointRounding.ToEven); _ainCount--;
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