cin 结束

#include <iostream>
using namespace std;
void ex1_6_arr ()
{
const max_arr =20;
int arr[max_arr];
int ival;
int len=0;//数组长度
int avg=0;
int sum=0;
while (cin >> ival && len < max_arr)
{
arr[len++]=ival;
}
for ( int ix=0 ;ix< len;++ix)
{
sum+=arr[ix];
}
avg=sum/len;
cout <<endl << "The sum and the average are:" << sum << "and" << avg << endl ;}
int main () {
ex1_6_arr (); return 0; //quitC++;
}
每次运行输入数字后不知如何结果！看过按ctrl+c的，可是我按后直接关掉了dos窗口。按ctrl+z没用.小女子在此谢过.