C++11标准

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for循环

　　

vector<int> vec;
vec.push_back(10);
vec.push_back(20);

for (int i : vec)
{
    cout << i;
}

map<string, string> address_book;
for (auto address_entry : address_book)
{
    cout << address_entry.first << " < " address_entry.second << " > " << endl;
}