c#快速排序

using System;
/*
描写：C#实现快速排序算法
创建日期：2006/05/08
*/
namespace ConsoleApplication1
{
    class DataStructDemo
    {
        static void swap(ref int a,ref int b)
        {
            int temp;
            temp=a;
            a=b;
            b=temp;
        }
        static void sort(int[] arr,int left,int right)
        {
            int i,j,s;

            if(left < right)
            {
                i=left - 1;
                j=right + 1;
                s=arr[(i + j) / 2];
                while(true)
                {
                    while(arr[++i]<s);
                    while(arr[--j]>s);
                    if(i>=j)
                        break;
                    swap(ref arr[i],ref arr[j]);
                }
                sort(arr,left,i-1);
                sort(arr,j+1,right);
            }
        }
            [STAThread]
        static void Main(string[] args)
        {
                int[] arr={2,4,65,76,87,90,56,89,78};
                sort(arr,0,arr.Length-1);
                 Console.WriteLine("            Quick Sort Test!!!");
                for(int i=0;i<arr.Length;i++)
                {
                    Console.WriteLine(arr[i]);
                }
        }
    }
}