What is the C program for quick sort using recursion?

//quick sort recursive c program

#define maxsize 6

int A[maxsize];

void quicksort(int a, int b)
{
int rtidx=0,ltidx=0,k=a,l=0,pivot;
int leftarr[maxsize],rtarr[maxsize];
pivot=A[a];
if(a==b)return;
while(k<b)
{
++k;
if(A[k]<A[a])
{
leftarr[ltidx]=A[k];
ltidx++;
}
else
{
rtarr[rtidx]=A[k];
rtidx++;
}
}

k=a;
for(l=0;l<ltidx;++l)A[k++]=leftarr[l];
A[k++]=pivot;
for(l=0;l<rtidx;++l)A[k++]=rtarr[l];
if(ltidx>0)quicksort(a,a+ltidx-1);
if(rtidx>0)quicksort(b-rtidx+1,b);
}

void printarr(int a)
{
int i;
for(i=0;i<a;i++)
{
printf("%d",A[i]);
printf("\n");
}
}

main()
{
int i,s;
printf("enter the number of numbers to be entered \n");
scanf("%d",&s);
for(i=0;i<s;i++)
{
printf("enter the number \n" );
scanf("%d",&A[i]);
}
printf("array before sorting ");
printarr(s);
quicksort(0,s-1);
printf("array after sorting");
printarr(s);
}