《c程序设计语言》读书笔记-递归实现快速排序算法

#include <stdio.h>

void swap(int v[],int i,int j)
{
    int temp;

    temp = v[i];
    v[i] = v[j];
    v[j] = temp;
}

void qsort(int v[],int left,int right)
{
    int i,last;

    if(left >= right)
        return;
    swap(v,left,(left + right) / 2);
    last = left;
    for(i = left + 1;i <= right;i++)
        if(v[i] < v[left])
            swap(v,++last,i);
    swap(v,left,last);

    qsort(v,left,last - 1);
    qsort(v,last + 1,right);
}
int main()
{

    int v[10] = {10,9,8,7,6,5,4,3,2,1};
    int i;

    qsort(v,0,9);

    for(i = 0;i < 10;i++)
    printf("%d ",v[i]);

    return 0;
}