How do I compose the add and find funtions in this program?

[nyfan68]

I have been working on this phonebook application for a few days now.  I am suppose to Create classes Name, PhoneNumber, and PhoneBook that are employed by the provided phone book program, PhoneBookProgram.cpp.

Class Name
Represents the name for a listing in a phone book (example: Phil’s Pizza)
Overloads stream insertion (<<) and stream extraction (>>) operators
Stream extraction operator validates text entered by user for a name
    skips any initial white space typed by user
    throws a runtime exception if input name is invalid
    name must be at least 1 character and a maximum of 25 characters
    does not modify Name object if input name is invalid

Class PhoneNumber
    Represents the phone number for a listing in a phone book (example: 919-555-1234)
    Overloads stream insertion (<<) and stream extraction (>>) operators
    Stream extraction operator validates text entered by user for a phone number
    skips any initial white space typed by user
    throws a runtime exception if input phone number is invalid
    phone number must be 12 characters in length 
    phone number must be in the format xxx-xxx-xxxx
    phone number must only contain digits (0-9) except for two dashes (-)
    does not modify PhoneNumber object if input phone number is invalid

 Class PhoneBook
    Represents the listings in a phone book
    Overloads stream insertion (<<) operator
    Stream insertion operator outputs phone book in tabular format:
Phil's Pizza                  919-555-1234
Sarah's Shoes                 800-111-1111
Blue's Clues PI               363-712-3434
    add member function adds a listing to the phone book
    throws a runtime exception if name already added to the phonebook
    throws a runtime exception if maximum number of listings in the phone book (maximum listings = 1000)
    prototype:
void add(const Name&, const PhoneNumber&);
    find member function finds a listing to the phone book
    returns the phone number for the listing found with name
    throws a runtime exception if name not found in phonebook
    prototype:
const PhoneNumber& find(const Name&) const;

Here is my code so far:

#ifndef Name_H
#define Name_H

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


class Name : 

{
    friend ostream &operator<<( ostream &, const Name & );
    friend istream &operator>>( istream &, Name & );
public:
Name(string name);

void setName(string n);
string getName() const;




string name;
};
#endif

#include <iostream>
#include <iomanip>
#include "Name.h"
using namespace std;

Name::Name(string n)
{
    name = n;
}

void Name::setName(string n)
{
    name = n;
}

string Name::getName() const
{
    return name;
}
ostream &operator<< ( ostream &output, const Name &name)
{
    output << name.name;
    return output;

}

istream &operator>>(istream &input, Name &name )
{

    char ws;
    input >> ws;
    getline(input,name.name);

}

#ifndef PhoneNumber_H
#define PhoneNumber_H
#include "Name.h"
#include <iostream>
#include <string>
#include <stdexcept>
using namespace std;

class PhoneNumber

{
    friend ostream &operator<<( ostream &, const PhoneNumber & );
    friend istream &operator>>( istream &, PhoneNumber & );
public:
PhoneNumber(string number);

void setNumber(string n);




string number;
};





#endif

#include <iostream>
#include <iomanip>
#include "PhoneNumber.h"
using namespace std;

PhoneNumber::PhoneNumber(string n)
{
    number = n;
}

void PhoneNumber::setNumber(string n)
{
    number = n;
}
ostream &operator<< ( ostream &output, const PhoneNumber &number)
{
    output << number.number;
    return output;

}

istream &operator>>(istream &input, PhoneNumber &number )
{

    char ws;
    input >> ws;
    getline(input,number.number);
}

#ifndef PhoneBook_H
#define PhoneBook_H
#include "PhoneNumber.h"
#include <iostream>
#include <string>
#include <stdexcept>

using namespace std;

class PhoneBook  
{
friend ostream &operator<<( ostream &, const PhoneNumber &);

public:
PhoneBook();


void add(const Name&, const PhoneNumber&);
const PhoneNumber& find(const Name&) const;

private:
    string aNames[ 1000 ];
    string aNumbers[ 1000 ];
};
#endif

#include <iostream>
#include <iomanip>
#include "PhoneBook.h"
#include "Name.h"
#include "PhoneNumber.h"
using namespace std;

ostream &operator<< ( ostream &output, const PhoneNumber &number)
{
    ios_base::fmtflags originalFormat = output.flags();
    output << left << setw(30) << Name::getName << number << endl;
    output.flags(originalFormat);

}

void add(const Name &name, const PhoneNumber &number)
{

}

const PhoneNumber& find(const Name&) 
{

}

Here is the driver which is supposed to be modified afterwards to hold the try/catch blocks

#include <iostream>
using namespace std;

#include "PhoneBook.h"

int main()
{
    PhoneBook phoneBook;

    bool quit = false;    // Flag to stop looping
    while (! quit)
    {
        // Output phone book menu
        cout << endl
            << "Phone Book Menu\n"
            << "1: add a listing\n"
            << "2: find a listing\n"
            << "3: print phone book\n"
            << "q: quit\n\n"
            << "Choice: ";

        // Input text typed by user
        string choice;
        cin >> ws;            // skip initial whitespace
        getline(cin, choice); // input user text

        Name name;
        PhoneNumber number;

        if (choice == "1")       // Add a listing
        {
            cout << "Add a Listing\n";
            cout << "Enter listing name: ";
            cin >> name;
            cout << "Enter listing phone number: ";
            cin >> number;
            phoneBook.add(name, number);
        }

        else if (choice == "2")  // Find a listing
        {
            cout << "Find a Listing\n";
            cout << "Enter name to find: ";
            cin >> name;
            cout << phoneBook.find(name) << endl;
        }

        else if (choice == "3")  // Print phone book
        {
            cout << "Print Phone Book\n";
            cout << phoneBook;
        }

        else if (choice == "q")  // Quit
        {
            cout << "Good-bye" << endl;
            quit = true;
        }

        else                     // Invalid user input
        {
            cerr << "Invalid choice: " << choice << endl;
        }
    }
}

I am having a hard time figuring out how I am suppose to implement the find and add functions using the prototypes provided. If anyone could give me some help, I would appreciate it.

[umar hayat]

I cannot understand the question. plz explain

[nyfan68]

The functions void add(const Name&, const PhoneNumber&) and const PhoneNumber& find(const Name&) const, in the PhoneBook class. I need help with implementing them as I don't know how to do it, given the prototypes provided by my instructor.

[vijayan121]

Ideally use a std::vector<> to hold the names and numbers.

If you must use arrays (you have a teacher ... ), you need to keep track of the size manually. Something like:

struct PhoneBook
{
    // ...
    void add( const Name& n, const PhoneNumber& p )
    {
        if( current_size < MAXSZ )
        {
            aNames[current_size] = n ;
            aNumbers[current_size] = p ;
        }
        else { /* error: no more space */ }
    }

    const PhoneNumber& find( const Name& n ) const
    {
        // look into the names array and get the position,
        // return number at that position
        for( std::size_t pos = 0 ; pos < current_size ; ++pos )
           if( aNames[pos] == n ) return aNumbers[pos] ;

        // error: not found - return something invalid (or throw)
        static const PhoneNumber no_phone_number = "-1" ;
        return no_phone_number ;
    }

    private:

        static constexpr std::size_t MAXSZ = 1000 ;
        Name aNames[ MAXSZ ] ;
        PhoneNumber aNumbers[ MAXSZ ] ;
        std::size_t current_size = 0 ;
};