ช่วยหน่อยคับ เรื่อง โปรแกรมQuicksort

รันไม่ผ่านน่ะคับ
ช่วยแก่ทีคับว่าผิดตรงไหน ปวดหัวไปหมดแล้ว
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX 12
void showlist(int arr[],int st,int end)
{
int i;
for( i=st;i<=end;i++)
printf("%d ",arr[i]);
}
void doquicksort(int arr[],int low,int up)
{
int piv,temp,left,right;
pivot=false;
left=low;
right=up;
piv=low; // take first element as pivot
if(low>=up)
return;
printf("Sublist (");
showlist(arr,low,up);
printf("\b)");
while(!pivot)
{
// Compare from right to left
while( arr[piv]<=arr[right] && piv!=right )
right=right-1;
if( piv==right )
bool pivot=true;
if( arr[piv] > arr[right] )
{
temp=arr[piv];
arr[piv]=arr[right];
arr[right]=temp;
piv=right;
}
// Compare from left to right
while( arr[piv]>=arr[left] && left!=piv )
left=left+1;
if(piv==left)
pivot=true;
if( arr[piv] < arr[left] )
{
temp=arr[piv];
arr[piv]=arr[left];
arr[left]=temp;
piv=left;
}
}
printf("\nPivot is %d\n",arr[piv]);
printf("Sorted sublist : (");
showlist(arr,low,up);
printf("\b)\n\n");
doquicksort(arr,low,piv-1);
doquicksort(arr,piv+1,up);
}
void main()
{
int arr[MAX]={48,29,8,59,72,88,42 ,65, 95, 19, 82, 68};
int n,i;
n=12;
printf("Before sort : ");
showlist(arr,0,n-1);
printf("\n");
doquicksort(arr,0,n-1);
printf("After sorted : ");
showlist(arr,0,n-1);
printf("\n");
}