#include<stdio.h>
#include<stdlib.h>
void qsort1(int *,int,int );
int part(int *,int,int);
int main()
{
    int a[6]={5,4,6,8,4,7};
    qsort1(a,0,5);
    printf("%d%d%d%d%d%d",a[0],a[1],a[2],a[3],a[4],a[5]);
    return 0;
    }
void qsort1(int *p,int low,int high)
{
     int pre;
     pre=part(p,low,high);
     qsort1(p,low,pre-1);
     qsort1(p,pre+1,high);
     }
int part(int *q,int low1,int high1)
{
    int key,r;
    [color=FF0000]r=*(q+low1);[/color]    key=*(q+low1);
    while(low1<high1)
    {
         while(low1<high1&&*(q+high1)>=key)
         high1--;
         *(q+low1)=*(q+high1);
         while(low1<high1&&*(q+low1)<=key)          
              low1++;
           *(q+high1)=*(q+low1);     }
    *(q+low1)=r;
    return low1;
    }
运行时说r=*(q+low1)这句段异常，实在不知道怎么回事...请各位帮忙指教！