For Loop：
=== old
????for (int i = 0; i < argCount; ++i)
????{
????????std::cout << arr[i];
????}
=== new
????for (auto i:arr)
????????std::cout << i <<" ";
?
????
PickUp (1)
原文：http://www.cnblogs.com/permanence-practice/p/4852033.html
