An example of advanced erase in C++ maps

The following example shows how to use erase in C++ maps

//Program tested on Microsoft Visual Studio 2008 - Zahid Ghadialy
//This program shows an example of how C++ maps erase work.
#include <iostream>
#include <map>

using namespace std;

int main ()
{
  map<char,int> zgmap;
  map<char,int>::iterator it,it_low,it_up;

  zgmap['a']=1;
  zgmap['b']=2;
  zgmap['c']=3;
  zgmap['d']=4;
  zgmap['e']=5;
  zgmap['g']=6;
  zgmap['j']=7;
  zgmap['n']=8;

  it_low=zgmap.lower_bound ('c');  // it_low points to c
  it_up=zgmap.upper_bound ('j');   // it_up points to n and not j

  zgmap.erase(it_low,it_up);        // erases all elements from c to j

  //Print Map contents
  cout<<"\n** Printing the zgmap contents **"<<endl;
  for ( it=zgmap.begin() ; it != zgmap.end(); it++ )
  {
    cout << (*it).first << " => " << (*it).second << endl;
  }

  return 0;
}

The output of the program is as follows: