C語言 快速排序 Quick Sort

#include <stdio.h>

void exchange(int *array, int p1, int p2)
{
    if (p1 == p2)
        return;
    int temp = array[p1];
    array[p1] = array[p2];
    array[p2] = temp;
}

int partition(int *array, int left, int right)
{
    int pivot = array[right];
    int index = left - 1;//storage postion，start with outside
    int cur;
    for (cur = left; cur < right; cur++)
    {
        if (array[cur] <= pivot)
        {
            exchange(array, ++index, cur);//exchange smaller data than pivot to index postion and increase the index
        }
    }
    exchange(array, ++index, right);//after exchange all data smaller than pivot, exchange the pivot to the next postion index's next psotion
    return index;
}

void quickSort(int *array, int left, int right)
{
    if (left < right)
    {
        int partitionPos = partition(array, left, right); //get the partition postion
        quickSort(array, left, partitionPos - 1);         //Sorts the left interval of the array
        quickSort(array, partitionPos + 1, right);        //Sorts the right interval of the arrays
    }
}

void main()
{
    int array[5] = {1, 7, 9, 2, 4};
    printf("array=");
    int i;
    for (i = 0; i < sizeof(array); i++)
    {
        printf("%d ", array[i]);
    }
    printf("\n");
    quickSort(array, 0, sizeof(array) - 1);
    printf("array=");
    for (i = 0; i < sizeof(array); i++)
    {
        printf("%d ", array[i]);
    }
    return;
}