I need help with this exercise (2).

/*

* File: familytree.cpp

* --------------------

* This program implements the familytree.h interface.

*/

#include "familytree.h"

#include "vector.h"

using namespace std;

FamilyTreeNode::FamilyTreeNode(const string & name) {

this->name = name;

this->parent = NULL;

}

string FamilyTreeNode::getName() {

return name;

}

void FamilyTreeNode::addChild(FamilyTreeNode *child) {

children.add(child);

child->parent = this;

}

FamilyTreeNode *FamilyTreeNode::getParent() {

return parent;

}

Vector FamilyTreeNode::getChildren() {

return children;

}

/*

* File: familytree.h

* ------------------

* This file is an interface to a simple class that represents

* an individual person in a family tree.

*/

#ifndef _familytree_h

#define _familytree_h

#include

#include "vector.h"

/*

* Class: FamilyTreeNode

* ---------------------

* This class defines the structure of an individual in the family

* tree, which consists of a name and a vector of children.

*/

class FamilyTreeNode {

public:

/*

* Constructor: FamilyTreeNode

* Usage: FamilyTreeNode *person = new FamilyTreeNode(name);

* ---------------------------------------------------------

* This function constructs a new FamilyTreeNode with the specified

* name. The newly constructed entry has no children, but clients

* can add children by calling the addChild method.

*/

FamilyTreeNode(const std::string & name);

/*

* Method: getName

* Usage: string name = person->getName();

* ---------------------------------------

* Returns the name of the person.

*/

string getName();

/*

* Method: addChild

* Usage: person->addChild(child);

* -------------------------------

* Adds child to the end of the list of children for person, and

* makes person the parent of child.

*/

void addChild(FamilyTreeNode *child);

/*

* Method: getParent

* Usage: FamilyTreeNode *parent = person->getParent();

* ----------------------------------------------------

* Returns the parent of the specified person.

*/

FamilyTreeNode *getParent();

/*

* Method: getChildren

* Usage: Vector children = person->getChildren();

* -----------------------------------------------------------------

* Returns a vector of the children of the specified person.

* Note that this vector is a copy of the one in the node, so

* that the client cannot change the tree by adding or removing

* children from this vector.

*/

Vector getChildren();

private:

std::string name;

FamilyTreeNode *parent;

Vector children;

};

#endif

(a) Exercise 2: Using the given familytree.h and familytree.cpp, write a function displayFami- ly Tree that displays all the individuals in a family tree. See the specifications on pp. 727-728