11. Looking at a map

• Use count( key ) to see if key is in the map

• For a map, count( ) will always return 0 or 1

  
      map< string, int > agemap;
      string name = "fred";
  
      int age = agemap[ name ]; // Always succeeds, might return 0
  
      if ( agemap.count(name) == 0 ) {
          // name is not in map
      }