第三天学习内容 if--else

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

namespace day03
{
    class Program
    {
        static void Main(string[] args)
        {
            /*   int x = Convert.ToInt32(Console.ReadLine());
              // Console.WriteLine(x == 0 ? "x=0" : "x!=0");
               if (x==0)
               {
                   Console.WriteLine("x=0");
               }
               else
               {
                   Console.WriteLine("x!=0");
               }
               Console.ReadKey();

//分数的分类
               Console.WriteLine("请输入姓名");
               Console.ReadLine();
               Console.WriteLine("请输入分数");
               double a = Convert.ToDouble(Console.ReadLine());
               if (a<50&&a>0)
               {
                   Console.WriteLine("使劲努力，不要偷懒");

}
               else if (a >= 50 && a < 60)
               {
                   Console.WriteLine("就差一点点，再加把劲");
               }
               else if (a>=60&&a<=100)
               {
                   Console.WriteLine("恭喜你及格了");
                   if (a>80)
                   {
                       Console.WriteLine("你学的不错值得表扬！");
                   }
               
               }
               else
                   {
                       Console.WriteLine("您输入的分数有误");
                   }
               Console.ReadKey();

//标准体重的计算
               Console.WriteLine("请输入性别");
               string a=Console.ReadLine();
               Console.WriteLine("请输入体重");
               double b = Convert.ToDouble(Console.ReadLine());
               Console.WriteLine("请输入身高");
               double c = Convert.ToDouble(Console.ReadLine());
               double d;
               if (a=="男")
               {
                   d = b - c + 100;
               }
               else
               {
                   d = b - c + 110;
               }
               if (d>3)
               {
                   Console.WriteLine("您超重了");
               }
               else if (d<-3)
               {
                   Console.WriteLine("您需要增加营养");
               }
               else
               {
                   Console.WriteLine("您的体重为标准体重");
               }
               Console.ReadKey();

//闰年的算法1
               Console.WriteLine("请输入一个年份");
               int y = Convert.ToInt32(Console.ReadLine());
               if ((y%4==0&&y%100!=0)||y%400==0)
               {
                   Console.WriteLine(y + "年2月29日存在");
               
               }
               else
               {
                   Console.WriteLine(y + "年2月29日不存在");
               }
               Console.ReadKey();
            //算法2
               Console.WriteLine("请输入年份");
               int y = Convert.ToInt32(Console.ReadLine());
               if (y % 4!= 0)
               {
                   Console.WriteLine("该年份不是闰年");
               }
               else
               {
                   if (y%100 !=0)
                   {
                       Console.WriteLine("该年份是闰年");
                   }
                   else if (y%400!=0)
                   {
                       Console.WriteLine("该年份不是闰年");
                   }
                   else
                   {
                       Console.WriteLine("该年份是闰年");
                   }

}
               Console.ReadKey();

*
             *   //结婚的例子1
            Console.WriteLine("你有房吗");
            string a = Console.ReadLine();
            if (a=="有")
            {
                Console.WriteLine("你有车吗");
                string b = Console.ReadLine();
                if (b=="有")
                {
                    Console.WriteLine("你有钱吗");
                   string c = Console.ReadLine();
                    if (c=="有")
                {
                    Console.WriteLine("我们结婚吧");
                }
                else
                {
                    Console.WriteLine("以后要好好工作努力赚钱");
                }
                }
                else
                {
                    Console.WriteLine("抓紧时间给我买辆车");
                }

}
            else
            {
                Console.WriteLine("慢走不送");
            }
            Console.ReadKey();
        }
             *
             *
            //例子2

Console.ReadKey();

//输出三个数中最大的数
               Console.WriteLine("请输入三个数");
               int a, b, c,d;
               a = Convert.ToInt32(Console.ReadLine());
               b = Convert.ToInt32(Console.ReadLine());
               c = Convert.ToInt32(Console.ReadLine());
               if (a>b&&a>c)
               {
                   d = a;
               }
               else if (b > a && b > c)
               {
                   d = b;
               }
               else
               {
                   d = c;
               }
               Console.WriteLine("最大的数是" + d);
               Console.ReadKey();

Console.WriteLine("请选择7以内的一个数");
            int a = Convert.ToInt32(Console.ReadLine());
            string x;
            switch (a)
            {
                case 1:
                    x = "选择的是星期一";
                    break;
                case 2:
                    x = "选择的是星期二";
                    break;
                case 3:
                    x = "选择的是星期三";
                    break;
                case 4:
                    x = "选择的是星期四";
                    break;
                case 5:
                    x = "选择的是星期五";
                    break;
                case 6:
                    x = "选择的是星期六";
                    break;
                case 7:
                    x = "选择的是星期天";
                    break;
                default:
                    x = "选择的是默认";
                    break;
            }
            Console.WriteLine(x);
            Console.ReadKey();
            */

//猜拳的算法         
            Random r = new Random();
            string x, y;
            int a = r.Next(0, 3);
            int b = r.Next(0, 3);
            switch (a)
            {
                case 0:
                    x = "剪刀";
                    break;
                case 1:
                    x = "石头";
                    break;
                case 2:
                    x = "布";
                    break;
                default:
                    x = "耍赖";
                    break;
            }
            switch (b)
            {
                case 0:
                    y = "剪刀";
                    break;
                case 1:
                    y = "石头";
                    break;
                case 2:
                    y = "布";
                    break;
                default:
                    y = "耍赖";
                    break;
            }
            Console.WriteLine("x出的是" + x);
            Console.WriteLine("y出的是" + y);
            string jg = "";
            if (a == b)
            {
               jg="平局";

}
            else if (a>b)                    
            {
               
               
                    if (a==2&&b==0)
                    {
                       jg="y胜利";
                     }
                else
                  {
                        jg="x胜利";
                   }
                                                                             
                   
             }

else  if (b>a)
                {
                    if (a==0&&b==2)
                {
                     jg="x胜利";
  
                }
                    else
                    {
                      jg="y胜利";
                    }
                }
               
            Console.WriteLine(jg);
            Console.ReadKey();

}
      
        }
    }