C++11 for循环 C++11的for循环的新用法(推荐)
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字符串
string str = "this is a string"; for(auto ch : str) cout << ch << endl;
等价于
for(int i = 0; i < str.size(); i++) cout << str[i] << endl; vector vector<int> v = {1, 2, 3, 4, 5}; for(auto i : v) cout << i << endl;
等价于
for(int i = 0; i < v.size(); i++) cout << v[i] << endl;
二维vector
vector<vector<int>> v = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; for(auto i : v) for(auto j : i) cout << j << endl;
等价于
for(int i = 0; i < v.size(); i++) for(int j = 0; j < v[i].size(); j++) cout << v[i][j] << endl;
数组
int ary[] = {1, 2, 3, 4, 5}; for(auto i : ary) cout << i << endl;
等价于
for(int i = 0; i < 5; i++) cout << ary[i] << endl; map map<char, int> m = {{'a', 1}, {'b', 2}, {'c', 3}}; for(auto t : m) cout << t.first << ' ' << t.second << endl;
等价于
for(map<char, int> :: iterator itr = m.begin(); itr != m.end(); itr++) cout << itr ->first << ' ' << itr ->second << endl;
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