I would like an opinion from visitors and senior programmers on the following test question that I'm considering to give to a class of students who are beginning to learn C programming. If I was to ask these students to describe what is going on with this sort program, do think it would be fair to ask them this when they only have an 1 hour and 45 minutes to complete it the 10 question exam. I feel that these students should spend at the most, 30 minutes on this question. Tell me what you think? If you want... try to answer the question. I know how much you guy's like a challenge!

Thank you!

Code:

#include <stdio.h>

#define N 10

void quicksort(int a[], int low, int high);

int split(int a[], int low, int high);

main()

{

int a[N], i;

printf("Enter %d numbers to be sorted: ", N);

for(i = 0; i < N; i++)

scanf("%d", &a[i]);

quicksort(a, 0, N - 1);

printf("In sorted order: ");

for(i = 0; i < N; i++)

printf("%d ", a[i]);

printf(" \n");

getchar();

getchar();

return 0;

}

void quicksort(int a[], int low, int high)

{

int middle;

if(low >= high) return;

middle = split(a, low, high);

quicksort(a, low, middle - 1);

quicksort(a, middle + 1, high);

}

int split(int a[], int low, int high)

{

int part_element = a[low];

for(;;){

while(low < high && part_element <= a[high])

high--;

if(low >= high) break;

a[low++] = a[high];

while(low < high && a[low] <= part_element)

low++;

if(low >= high) break;

a[high--] = a[low];

}

a[high] = part_element;

return high;

}