Standard Template Library Map на C++

#include "stdafx.h"
#include <map>
#include <iostream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
setlocale(LC_ALL,"Rus");
std::map<char,int> first_map,second_map;
first_map['i']=1;
first_map['j']=2;
second_map['m']=11;
second_map.swap(first_map);
for (std::map<char,int>::iterator it=second_map.begin(); it!=second_map.end(); ++it)
{
std::cout << it->first << " => " << it->second << '\n';
}
cout<<endl;
std::map<char,int> my_map;
my_map['a']=2;
my_map['b']=4;
my_map['c']=7;
cout<<my_map.size()<<endl;

std::map<char,int>::iterator it_insert = my_map.begin();
my_map.insert(it_insert, std::pair<char,int>('d',10));

my_map.erase ('b');

for (std::map<char,int>::iterator it=my_map.begin(); it!=my_map.end(); ++it)
{
std::cout << it->first << " => " << it->second << '\n';
}
cout<<endl;
for (std::map<char,int>::reverse_iterator rit=my_map.rbegin(); rit!=my_map.rend(); ++rit)
{
std::cout << rit->first << " => " << rit->second << '\n';
}
my_map.clear();
if(my_map.empty()){
cout<<"Empty"<<endl;
}
system("pause");
return 0;
}

Результат работы программы Map на C++: