冒泡排序

其基本思想是：

将被排序的记录数组R[1..n]垂直排列，每个记录R看作是重量为R.key的气泡。根据轻气泡不能在重气泡之下的原则，从下往上扫描数组R：凡扫描到违反本原则的轻气泡，就使其向上"飘浮"。如此反复进行，直到最后任何两个气泡都是轻者在上，重者在下为止。

测试：

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] iArray ={ 10, 5, 2, 4, 3, 6, 7, 9, 1, 8 };
            BubbleSort(iArray);
        }

        public static void BubbleSort(int[] arr)
        {
            int temp=0;
            int exchange = 0;

            for (int i = 0; i < arr.Length; i++)
            {
                for (int j = i + 1; j < arr.Length; j++)
                {
                    if (arr[j] < arr[i])
                    {
                        temp = arr[i];

                        arr[i] = arr[j];
                        arr[j] = temp;

                        exchange++;
                    }
                }
            }

            Console.WriteLine("Exchange time is " + exchange + ".");

            for (int n = 0; n < arr.Length ; n++)
            {
                Console.WriteLine(arr[n]);               
            }
        }
    }
}