// compile with g++ maptest.cpp

#include <iostream>
#include <map>

using namespace std;

int main()
{
 map <char, int> m1;

 cout << "Assigning values"  << endl;
 m1['j'] = 30;
 m1['a'] = 40;
 m1['x'] = 20;
 m1['k'] = 10;
 m1['3'] = 80;
 m1['*'] = 50;

 cout << "Number of elements in the map: " << m1.size() << endl;
 cout << "m1['j']: " << m1['j'] << endl;
 cout << "m1['a']: " << m1['a'] << endl;
 cout << "m1['x']: " << m1['x'] << endl;
 cout << "m1['k']: " << m1['k'] << endl;
 cout << "m1['3']: " << m1['3'] << endl;
 cout << "m1['*']: " << m1['*'] << endl;
 cout << "m1['l']: " << m1['l'] << endl;  // Value not assigned
 cout << "Number of elements in the map: " << m1.size() << endl;

 cout << endl << "Changing values" << endl;
 m1['j'] = 60;
 m1['l'] = 70;

 cout << "m1['j']: " << m1['j'] << endl;
 cout << "m1['a']: " << m1['a'] << endl;
 cout << "m1['x']: " << m1['x'] << endl;
 cout << "m1['k']: " << m1['k'] << endl;
 cout << "m1['3']: " << m1['3'] << endl;
 cout << "m1['*']: " << m1['*'] << endl;
 cout << "m1['l']: " << m1['l'] << endl;

 cout << endl << "Using an iterator" << endl;
 map<char, int>::iterator miter1;

 for (miter1 = m1.begin(); miter1 != m1.end(); ++miter1)
     {
      cout << "Key: " << miter1->first << ", Value: " << miter1->second << endl;
     }
 
 cout << endl << "Which Keys exist in the map (check letters i-n)?" << endl;
 for (char ch = 'i'; ch <= 'n'; ch++)
     {
      cout << "  The Key of " << ch ;
      if (m1.count(ch) == 0)
          cout << " does not exist in the map." << endl;
      else
          cout << " does exist in the map." << endl;
     }

 cout << endl << "Delete Key k from the map" << endl;
 miter1 = m1.find('k');
 m1.erase (miter1);
 cout << "Delete Key l from the map" << endl;
 m1.erase('l');

 cout << endl << "Which Keys exist in the map (check letters i-n)?" << endl;
 for (char ch = 'i'; ch <= 'n'; ch++)
     {
      cout << "  The Key of " << ch ;
      if (m1.count(ch) == 0)
          cout << " does not exist in the map." << endl;
      else
          cout << " does exist in the map." << endl;
     }

 cout << endl << "Current keys and values" << endl;
 for (miter1 = m1.begin(); miter1 != m1.end(); ++miter1)
     {
      cout << "Key: " << miter1->first << ", Value: " << miter1->second << endl;
     }
 
}