1// map::at
2#include <iostream>
3#include <string>
4#include <map>
5
6int main ()
7{
8  std::map<std::string,int> mymap = {
9                { "alpha", 0 },
10                { "beta", 0 },
11                { "gamma", 0 } };
12
13  mymap.at("alpha") = 10;
14  mymap.at("beta") = 20;
15  mymap.at("gamma") = 30;
16
17  for (auto& x: mymap) {
18    std::cout << x.first << ": " << x.second << '\n';
19  }
20
21  return 0;
22}