Use a map to create a phone directory: string class

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

class name {
  string str;
public:
  name() { 
      str = ""; 
  }
  name(string s) { 
      str = s; 
  }
  string get() { 
      return str; 
  }
};

// Define less than relative to name objects.
bool operator<(name a, name b){
   return a.get() < b.get();
}

class phoneNum {
  string str;
public:
  phoneNum() { 
      str = ""; 
  }
  phoneNum(string s) { 
      str = s; 
  }
  string get() { 
      return str; 
  }
};

int main()
{
  map<name, phoneNum> directory;

  directory.insert(pair<name, phoneNum>(name("J"), phoneNum("999-1111")));
  directory.insert(pair<name, phoneNum>(name("C"), phoneNum("999-2222")));
  directory.insert(pair<name, phoneNum>(name("J"),  phoneNum("555-3333")));
  directory.insert(pair<name, phoneNum>(name("T"),phoneNum("4444")));

  // given a name, find number
  string str;
  cout << "Enter name: ";
  cin >> str;

  map<name, phoneNum>::iterator p;
  
  p = directory.find(name(str));
  if(p != directory.end()) 
    cout << "Phone number: " <<  p->second.get();
  else
    cout << "Name not in directory.\n";

  return 0;
}

1.	A map: insert pair, find, end
2.	A map of opposites.
3.	A map of word opposites, using strings.
4.	Cycle through a map using an iterator.
5.	Cycle through a map in reverse.
6.	Using [] in Map
7.	[] automatically inserts elements.
8.	Maps can store only unique keys.
9.	Use the greater function object in Map
10.	Demonstrating a multimap.
11.	Use a multimap to create the phone directory.
12.	A simple map: char and int
13.	Use a map of strings to create a phone directory.
14.	File and map

Use a map to create a phone directory: string class : Map « Data Structure « C++

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