C语言：随机生成数+快速排序

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAXSIZE 10
void initArr(int arr[] , int length);
void showArr(int arr[] , int length);
void quickSort(int arr[] , int left , int right);
int main()
{
    
	srand((unsigned int)time(NULL));
	int arr[MAXSIZE];
	printf("==========排序前的序列=============\n");
	initArr(arr,MAXSIZE);
	showArr(arr,MAXSIZE);
	printf("==========快速排序后的序列=============\n");
	quickSort(arr,0,MAXSIZE-1);
	showArr(arr,MAXSIZE);
	system("pause");
	return 0;
} 
void initArr(int arr[] , int length)
{
    
	for(int i = 0 ; i < length ; i++){
    
		arr[i] = rand()%20;
	}
}
void showArr(int arr[] , int length)
{
    
	for(int i = 0 ; i < length ; i++){
    
		printf("%4d",arr[i]);
	}
	printf("\n");
}
void quickSort(int arr[] , int left , int right)
{
    
	//快速排序
	if(left>right){
    
		return;
	}
	int i = left;
	int j = right;
	int pivot = arr[i];
	while(i<j){
    
		while(i<j && arr[j] >= pivot){
    
			j--;
		}
		arr[i] = arr[j];
		while(i<j && arr[i] <= pivot){
    
			i++;
		}
		arr[j] = arr[i]; 
	}	
	arr[i] = pivot;
	quickSort(arr,left,i-1);
	quickSort(arr,i+1,right);
}