2.3.6.1 Maps - iterators

#include <iostream>
#include <map>
#include <vector>
#include <string>

using namespace std;

int main()
{

    map<string, int> variables_map = { {"x", 0}, {"y", 1}, {"z", 2},
                                       { "xx", 3 },{ "xy", 4 },{ "xz", 5 } };
    vector<int> values = { 9, 6, 5, 7, 3, 2};
    string variable_name;
    cin >> variable_name;
    auto i = variables_map.begin();

   for(i;i!=variables_map.end();i++ ){
       cout << " Variable: " << i->first << " at adress: " << i->second << " has value: " << values.at(i->second);
   }
    if(variables_map.count(variable_name)>0) {
        i = variables_map.find(variable_name);
        cout << " Variable: " << i->first << " at adress: " << i->second << " has value: " << values.at(i->second);
    }
    else cout << " Variable: " << variable_name << " doesn't exist.";
        return 0;
}