C++编程 从键盘输入8个浮点数，求出其和及平均值。

#include<iostream.h>
void main()
{
int i;
float num,average,sum = 0;
cout<<"输入8个浮点数:";
for(i = 0; i < 8; i++)
{
cin>>num;
sum += num;
}
average = sum / 8;
cout<<"和: "<<sum<<endl;
cout<<"平均值:"<<average<<endl;
}

#include<iostream>
using namespace std;

int main()
{
float a[8];
float sum = 0;
for(int j = 0; j < 8; j++)
{
cout << "请输入第" << j + 1 << "个数据";
cin >> a[j];
}
for(int i = 0; i < 8; i++)
{
sum += a[i];
}
cout << "the sum is " << sum << endl;
cout << "the average is " << sum/8 << endl;
return 0;
}

main
{ float a[8],sum,average;
int i;
for(i=0;i<8;i++)