冒泡排序

 int[] a = {3,6,2,1,5};
            for (int i = 0; i < a.Length-1; i++)
            {
                for (int j = 0; j < a.Length-i-1; j++)
                {
                    if (a[j] > a[j + 1]) 
                    {
                        int c = a[j];
                        a[j] = a[j + 1];
                        a[j + 1] = c;
                    }
                }
            }

            foreach (int intItem in a)
            {
                Console.WriteLine(intItem+"   ");
            }
            Console.ReadLine();