C++实现填充数组并求平均数及各值与平均数之差

C++实现填充数组并求平均数及各值与平均数之差。
其具体实现代码如下：

#include<iostream>
using namespace std;

const int largeLength = 4;

void fillArray(int a[],int number,int& numberUsed)
{
	int index=0,next;
	cout<<"请输入"<<number<<"个非负数\n";
	cout<<"键入负数表示结束！\n";
	cout<<"请输入数字："<<endl;
	cin>>next;
    cout<<next<<endl;
	while((next>=0)&&(index<number))
	{
		a[index]=next;
		index++; 
	    cout<<"请输入数字："<<endl;
	    cin>>next;
        cout<<next<<endl;
	}
  	numberUsed=index;
	cout<<"最终数为："<<numberUsed<<endl; 	
}

double computerAverage(const int a[],int numberUsed)
{
	double total = 0.00;
    for(int index = 0;index<numberUsed;index++)
    {
    	total += a[index];
	}
    return total;	
}

void showDifference(const int a[],int numberUsed)
{

	double average = computerAverage(a,numberUsed)/numberUsed;
	cout<<"Average of "<<numberUsed<<" is "<<average<<endl;
	cout<<"The scores are \n";
	for(int i=0;i<numberUsed;i++)
	cout<<a[i]<<"differs from average by "<<a[i]-average<<endl;
}

int main()
{
   int as[largeLength],numberUsed;
  
   fillArray(as,largeLength,numberUsed);
   showDifference(as,numberUsed);
   return 0;
}