1、数组 int array[] = {1, 2, 3, 4, 5};
for(auto e : array)
cout << e << endl;
等价于 for(int i = 0; i < 5; i++)
cout << array[i]<<endl;2、字符串
string str = 'hello world';for(auto ch : str)
cout << ch <<endl;等价于for(int i = 0; i <str.size(); i++)
cout << str[i] <<endl;
3、vector
vector<int> m_v = {1, 2, 3, 4};for(auto e : m_v)
cout << e <<endl;
等价于 for(int i = 0; i < m_v.size(); i++)
cout <<v[i]<<endl;4、map
map<int,string> m = {{1, 'abc'}, {2, 'bca'}, {3, 'cab'}};for(auto e : m)
cout <<e.first<<' '<< e.second<<endl;等价于for(map<int, string>::iterator it = m.begin();it != m.end(); it++)cout <<it->first<<' '<<it->second<<endl;
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