第九讲 C#练习题

1、接收一个整数N 如果N是正数就输出1·N

如果是负数就提示出错输出

由丰老师提供 -_-~

2、编一个程序，从三个红球，五个白球，六个黑球中任意取出八个球，且其中必须有白球，输出所有可能的方案。

3、编一个程序，楼梯有n阶阶梯，每次只能走一阶或者两阶，问，有多少种走法？

以上由王珂老师提供。

4、小超市

100 9.5
200 9
300 8.5
400 8

每次输入实际金额 显示折后价 并且显示本次节省多少钱

5、网吧充值
利用while循环一直执行
定义会员机构体
在循环外部定义一个集合用于存放会员结构体（用户名、密码、余额）
每次循环执行一次询问
（会员管理（新增会员、删除会员、余额查询（利用用户名查询）），充值管理（充值服务、扣费服务））

会员2元一小时

10元送2元，
20元送5元，
50元送20元，
100元送50元，
200元送150元。
300元以上充多少送多少
我冲多少钱 能玩多少小时 请提供具体信息。

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

namespace ConsoleApplication1
{
    class Program
    {
        struct huiyuan
        {
            public string name;
            public string password;
            public double yue;
        }
        static void Main(string[] aaa)
        {
            Console.BackgroundColor = ConsoleColor.White;
            Console.ForegroundColor = ConsoleColor.Black;
            Console.Clear();
            ArrayList Ul=new ArrayList();
            while (true)
            {

try
                {
                Console.WriteLine("请输入您要执行的操作：(1、会员管理\t2、充值管理)");
               int x=Convert.ToInt32( Console.ReadLine());
               m(x, Ul);
                }
                catch (Exception)
                {
                   
                   
                }
            }

}
        static void m(int x, ArrayList al)
        {
            switch (x)
            {
                case 1:
                    Console.WriteLine("1、添加会员\t2、删除会员\t3、余额查询");
                    int xx =Convert.ToInt32( Console.ReadLine());
                    huiyuanfuwu(xx, al);
                    break;
                case 2:
                    Console.WriteLine("1、充值服务\t2、扣费服务");
                    int xxx = Convert.ToInt32(Console.ReadLine());
                    chongzhiguanli(xxx,al);
                    break;
                default:
                    break;
            }
        }

static void chongzhiguanli(int x,ArrayList al)
        {
            switch (x)
            {
                case 1:
                    Console.Write("请输入要充值的用户名：");
                    string sname = Console.ReadLine();
                    foreach (huiyuan item in al)
                    {
                        if (item.name==sname)
                        {
                           
                            Console.WriteLine("当前余额为："+item.yue);
                            Console.Write("请输入充值金额：");
                            double m=Convert.ToInt32(Console.ReadLine());
                            chongzhi(m,al,sname);
                            break;

}
                    }
                    break;
                default:
                    break;
            }
        }

static void chongzhi(double m, ArrayList al,string sname)
         {
             double x = 0;//奖励金额

if (m>=10&&m<20)
             {
                 x = 2;
             }
             else if (m >= 20 && m < 50)
             {
                 x = 5;
             }
             else if (m >= 50 && m < 100)
             {
                 x = 20;
             }
             else if (m >= 100 && m < 200)
             {
                 x = 50;
             }
             else if (m >= 200 && m < 300)
             {
                 x = 150;
             }
             else if (m >= 300)
             {
                 x = m;
             }
             else
             {
                 x = 0;
             }
             huiyuan temp=new huiyuan();
             for (int i = 0; i < al.Count; i++)
             {
                 temp=((huiyuan)al[i]);
                 if (temp.name==sname)
                 {
                    
                     temp.yue += Convert.ToDouble(m + x);
                     Console.WriteLine("本次充值成功，充值金额为" + m + "。奖励金额为:" + x + ".充值后余额为：" + temp.yue);
                     al.Insert(i, temp);
                     al.RemoveAt(i + 1);
                     break;
                 }
                
             }
            
         }
        static void huiyuanfuwu(int x, ArrayList al)
        {
            switch (x)
            {
                case    1:
                    huiyuan h = new huiyuan();
                    Console.Write("请输入用户名：");
                    h.name = Console.ReadLine();
                    Console.Write("请输入密码：");
                    h.password = Console.ReadLine();
                    h.yue = 0;
                    al.Add(h);
                    break;
                case 2:
                    Console.Write("请输入要删除的用户名：");
                    string dname = Console.ReadLine();
                    foreach (huiyuan item in al)
                    {
                        if (item.name==dname)
                        {
                            al.Remove(item);
                            Console.WriteLine("删除成功！");
                            break;
                        }
                    }

break;
                case 3:
                    Console.Write("请输入要查询的用户名：");
                    string sname = Console.ReadLine();
                    foreach (huiyuan item in al)
                    {
                        if (item.name==sname)
                        {
                           
                            Console.WriteLine("当前余额为："+item.yue);
                        }
                    }
                    break;
                default:
                    break;
            }
        }

}
}