C++11新特性：迭代数组中的元素

#include<cstdio>
#include<iostream>
#include<array>
#include<string>
using namespace std;
int main()
{
	array<int, 5>items = { 1,2,3,4,5 };
	cout << "items before modification:";
	for (int item : items)
		cout << item << " ";
	for (int& itemRef : items)
	{
		itemRef *= 2;
	}
	cout << "\nitems after modification:";
	for (int item : items)
		cout << item << " ";
	cout << endl;
}