c 2b 2b map iterator

1//traditional way (long)
2for(map<string,int>::iterator it=m.begin(); it!=m.end(); ++it)
3	if(it->second)cout<<it->first<<" ";
4//easy way(short) just works with c++11 or later versions
5for(auto &x:m)
6	if(x.second)cout<<x.first<<" ";
7//condition is just an example of use
8

1#include <iostream>
2#include <map>
3 
4int main() {
5  std::map<int, float> num_map;
6  // calls a_map.begin() and a_map.end()
7  for (auto it = num_map.begin(); it != num_map.end(); ++it) {
8    std::cout << it->first << ", " << it->second << '\n';
9  }
10}

1    for (auto i : m)
2        cout << i.first << "   " << i.second
3             << endl;