C language: random generated number + insertion sort

#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 inserSort(int arr[] , int length);
int main()
{
    
	srand((unsigned int)time(NULL));
	int arr[MAXSIZE];
	printf("========== The sequence before sorting =============\n");
	initArr(arr,MAXSIZE);
	showArr(arr,MAXSIZE);
	printf("========== Insert sorted sequence =============\n");
	inserSort(arr,MAXSIZE); 
	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 inserSort(int arr[] , int length)
{
    
	// Insertion sort 
	for(int i = 1 ; i < length ; i++){
    
		for(int j = i ; j >= 1 && arr[j] < arr[j-1] ; j--){
    
			int temp = arr[j];
			arr[j] = arr[j-1];
			arr[j-1] = temp;
		}
	}
}