#include <iostream>
#include <map>
#include <string>
using namespace std; 

int main()
{
  map<string, int> gradebook;
  gradebook["Albert"] = 99;
  gradebook["Bonnie"] = 172;
  gradebook["Christopher"] = 85;

  cout << "The original size of the map is " << gradebook.size() << endl;
  gradebook.erase(gradebook.find("Christopher"));
  cout << "After erasing Christopher, the size of the map is " << gradebook.size() << endl;
  gradebook.insert(pair<string, int>("Buck", 12));

  if (!gradebook.empty())
  {
	cout << "After inserting Buck, the size of the map is " << gradebook.size() << endl;
  }

  string name = "Bonnie";
  if (gradebook.find(name) != gradebook.end())
  {
      cout << name << "'s grade is " << gradebook[name] << endl;
  }
  else
  {
      cout << name << " was not found" << endl;
  }

  // print all elements
  for (map<string, int>::iterator it = gradebook.begin(); it != gradebook.end(); it++) 
  {
	  cout << "name: " << it->first << " "
             << "grade: " << it->second << endl;
  }

  gradebook.clear();

  cout << "After calling clear, the size of the map is " << gradebook.size() << endl;

  return 0;
}