一.喝可乐练习

              Console.WriteLine("输入可乐数量：");
              int num1 = Convert.ToInt32(Console.ReadLine());//可乐
              int sum = num1;//空瓶
                  while (sum>2)
              {
                  num1 += sum / 3;
                  sum = sum / 3 + sum % 3;
              }
              Console.WriteLine("一共喝了{0}瓶可乐,剩下{1}空瓶",num1,sum);

二.数字转换练习

                        for (int i=0;i<sList.Length;i++)
                        {
                            if (('a' <= sList[i] && sList[i] <= 'z') || ('A' <= sList[i] && sList[i] <= 'Z'))
                            {
                                if ('x' <= sList[i] || 'X' <= sList[i] && sList[i] <= 'Z')
                                {
                                    sList[i] = Convert.ToChar(sList[i] - 23);
                                }
                                else
                                {
                                    sList[i] = (char)(sList[i] + 3);
                                }
                            }
                        }
                        Console.WriteLine(string.Join(' ',sList));*/

三.冒泡排序

            /* int [] num = { 10, 14, 33, 4, 8, 17, 6 };
             for (int i=1;i<=num.Length-1;i++) //只执行num.Length次
             {
                 for (int j = 0; j < num.Length-i; j++)  //比对每一轮的数 相邻两两进行对比
                 {
                     if (num[j] > num[j + 1])
                     {
                         int t = num[j]; //中间值
                         num[j] = num[j + 1];
                         num[j + 1] = t;
                     }
                 }
             }
             for (int i = 0; i < num.Length; i++)
             {
                 Console.WriteLine(num[i]);
             }*/