if条件语句练习题

习题一：

做一个算缘分的小游戏：
输入男方姓名，女方姓名，输出缘分指数，给出建议。

 static void Main(string[] args)
        {
        //做一个算缘分的小游戏：
           //输入男方姓名，女方姓名，输出缘分指数，给出建议。
            Console.WriteLine("男方姓名：");
            string nan = Console.ReadLine();
            Console.WriteLine("女方姓名：");
            string nv = Console.ReadLine();
            Random r = new Random();
            int n = r.Next();
            string jianyi = "";
            if (n>&&n<)
            {
                jianyi="有缘无分，分手吧";
            }
            else if (n>=&&n<)
            {
                jianyi="一起努力吧！";
            }
            else if (n>=&&n<)
            {
               jianyi="幸福一对";
            }
            else
            {
                jianyi="佳偶天成，珠联璧合";
            }
            Console.WriteLine("{0}和{1}的缘分指数是：{2}。建议：{3}",nan,nv,n,jianyi);
        }

习题二：相亲

   static void Main(string[] args)
         {
             //相亲
             string fangzi, piaozi, nengli;
             Console.Write("女神：有房子吗？");
             fangzi = Console.ReadLine();
             if (fangzi == "有")
             {
                 Console.WriteLine("女神：咱们结婚吧");
             }
             else
             {
                 Console.Write("女神：有钱吗？");
                 piaozi = Console.ReadLine();
                 if (piaozi=="有")
                 {
                     Console.WriteLine("女神：用钱买房子结婚吧");
                 }
                 else
                 {
                     Console.Write("女神：有能力吗？");
                     nengli = Console.ReadLine();
                     if (nengli=="有")
                     {
                         Console.WriteLine("女神：赶紧赚钱，买房子，结婚吧");
                     }
                     else
                     {
                         Console.WriteLine("女神：拜拜");
                     }

                 }

             }

         }

习题三：睡觉突然醒了，反应现在是几点，是否起床

  static void Main(string[] args)
         {
         //做梦醒了，看看时间，是否起床
             int  shijian, xingqi;
             Console.WriteLine("几点了？");
             shijian = Convert.ToInt32(Console.ReadLine());
             if (shijian<)
             {
                 Console.WriteLine("还早呢，再睡会");
             }
             else
             {
                 Console.WriteLine("今天星期几？");
                 xingqi = Convert.ToInt32(Console.ReadLine());
                 if (xingqi==||xingqi==)
                 {
                     Console.WriteLine("不上课，接着睡");
                 }
                 else
                 {
                     Console.WriteLine("赶紧起床，不然要迟到了");
                 }
             }
         }

习题四：模拟彩票中奖，计算机随机生成3个100以内的数，人类输入5个数，看是否中奖

 static void Main5555(string[] args)

 {
         //计算机生成100以内的3个数，输入5个数，输出中奖
             //颜色显示
             Console.ForegroundColor = ConsoleColor.DarkYellow;

             int caiduigeshu = ;

             //计算机随机输出
             Random random = new Random();
             int a = random.Next();
             int b= random.Next();
             int c = random.Next();

             //人类输入
             Console.WriteLine("*************请输入5个100以内的数：****************");
             Console.WriteLine("第一个数是：");
             int x1 = Convert.ToInt32(Console.ReadLine());
             Console.WriteLine("第二个数是：");
             int x2 = Convert.ToInt32(Console.ReadLine());
             Console.WriteLine("第三个数是：");
             int x3 = Convert.ToInt32(Console.ReadLine());
             Console.WriteLine("第四个数是：");
             int x4 = Convert.ToInt32(Console.ReadLine());
             Console.WriteLine("第五个数是：");
             int x5 = Convert.ToInt32(Console.ReadLine());
             //清屏
             Console.Clear();
             Console.WriteLine("电脑随机生成的数是:{0},{1},{2}",a,b,c);

             //运算输出
             if (a==x1||b==x1||c==x1)
             {
                 caiduigeshu++;

             }
             if (a == x2 || b == x2 || c == x2)
             {
                 caiduigeshu++;
             }
             if (a == x3 || b == x3 || c == x3)
             {
                 caiduigeshu++;
             }
             if (a == x4 || b == x4 || c == x4)
             {
                 caiduigeshu++;
             }
             if (a == x5 || b == x5 || c == x5)
             {
                 caiduigeshu++;
             }

             if (caiduigeshu==)
             {
                 Console.WriteLine("谢谢参与");
             }
             else if (caiduigeshu==)
             {

                 Console.WriteLine("恭喜你中了10元");
             }
             else if (caiduigeshu==)
             {
                 Console.WriteLine("恭喜你中了100元");
             }
             else if (caiduigeshu==)
             {
                 Console.WriteLine("恭喜你中了1000元");
             }
             else
             {
                 Console.WriteLine("恭喜你中了100万");
             }

         }

习题五：输入应发工资，输出所交税费和税后工资

个人所得税的计算方法：

  static void Main(string[] args)
         {
         //作业：输入应发工资，输出所交税费和税后工资

             double yfgz, shuifei, shgz;
             double m1 = 0.03, k1 = ;
             double m2 = 0.1, k2 = ;
             double m3 = 0.2, k3 = ;
             double m4 = 0.25, k4 =;
             double m5 = 0.3, k5 = ;
             double m6 = 0.35, k6 = ;
             double m7 = 0.45, k7 = ;

             //输入
             Console.WriteLine("请输入应发工资：");
             yfgz = Convert.ToDouble(Console.ReadLine());
             double s=yfgz-;   //

             //运算
             if (yfgz<=)
             {
                 shuifei = ;
                 shgz = yfgz;
                 Console.WriteLine("不用交税\n税后工资是："+shgz);
                 Console.WriteLine("应交税费是：" + shuifei);
             }
             else
             {
                 if (s>&&s<=)
                 {
                     shuifei = s*m1-k1;
                     shgz = yfgz-shuifei;
                     Console.WriteLine("税后工资是："+shgz);
                    Console.WriteLine("应交税费是：" + shuifei);
                 }
                 else if (s>&&s<=)
                 {
                     shuifei = s * m2 - k2;
                     shgz = yfgz - shuifei;
                     Console.WriteLine("税后工资是：" + shgz);
                     Console.WriteLine("应交税费是：" + shuifei);
                 }
                 else if (s >  && s <= )
                 {
                     shuifei = s * m3 - k3;
                     shgz = yfgz - shuifei;
                     Console.WriteLine("税后工资是：" + shgz);
                     Console.WriteLine("应交税费是：" + shuifei);
                 }
                 else if (s >  && s <= )
                 {
                     shuifei = s * m4 - k4;
                     shgz = yfgz - shuifei;
                     Console.WriteLine("税后工资是：" + shgz);
                     Console.WriteLine("应交税费是：" + shuifei);
                 }
                 else if (s >  && s <= )
                 {
                     shuifei = s * m5 - k5;
                     shgz = yfgz - shuifei;
                     Console.WriteLine("税后工资是：" + shgz);
                     Console.WriteLine("应交税费是：" + shuifei);
                 }
                 else if (s >  && s<=)
                 {
                     shuifei = s * m6 - k6;
                     shgz = yfgz - shuifei;
                     Console.WriteLine("税后工资是：" + shgz);
                     Console.WriteLine("应交税费是：" + shuifei);
                 }
                 else
                 {
                     shuifei = s * m7 - k7;
                     shgz = yfgz - shuifei;
                     Console.WriteLine("税后工资是：" + shgz);
                     Console.WriteLine("应交税费是：" + shuifei);
                 }
             }
         }