Need some help with this homework

[nyfan68]

 I'm kinda stuck with the first part of this assignment.

Design and implement a program for a phone book application.  Create classes Name, PhoneNumber, and PhoneBook that are employed by the provided phone book program, PhoneBookProgram.cpp.

The Name class is where I'm at. 

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
o   skips any initial white space typed by user
o   throws a runtime exception if input name is invalid
   name must be at least 1 character and a maximum of 25 characters
o   does not modify Name object if input name is invalid

So here is my code for the Name section.  I am having trouble with figuring out how to throw the exception if the name is invalid, due to not remembering how to check if the name is in between 1 and 25 characters.  I know I need to use the >, <, || operators, but I can't remember how to compare a string.  Any help would be appreciated.

#ifndef Name_H
#define Name_H

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


class Name : public runtime_error

{
    friend ostream &operator<<( ostream &, const Name & );
    friend istream &operator>>( istream &, Name & );
public:
Name()
    : runtime_error("Invalid Name") {}





private
string name;
};
#endif

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

ostream &operator<< ( ostream &output, const Name &name)
{
    output << name.name;
    return output;

}

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

    input>>name.name;
}

[Ancient Dragon]

how to check if the name is in between 1 and 25 characters. I know I need to use the >, <, || operators, but I can't remember how to compare a string. Any he

Just use std::string's length() method to find out how many characters are in the string. Just remember < is less than, > is greater than == is equal to, then there are <= and >=. Write that down on a piece of paper and keep it by your computer so that you can refere to it until you have it memorized.

[Schol-R-LEA]

Are you sure that you want to inherit from runtime_error (that is, that a Name is a specific example of a runtime_error), or just throw such an error?

[nyfan68]

Schol -R- LEA I just noticed that I am supposed to THROW the exception not inherit. My main is suppose to contain the try/catch blocks. The main is supplied but I need to modify it to make it work correctly. I will post the full problem in a sec

[nyfan68]

Here is the full problem along with the main.

Design and implement a program for a phone book application. 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
o   skips any initial white space typed by user
o   throws a runtime exception if input name is invalid
   name must be at least 1 character and a maximum of 25 characters
o   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
o   skips any initial white space typed by user
o   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 (-)
o   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
o   throws a runtime exception if name already added to the phonebook
o   throws a runtime exception if maximum number of listings in the phone book (maximum listings = 1000)
o   prototype:
void add(const Name&, const PhoneNumber&);
•   find member function finds a listing to the phone book
o   returns the phone number for the listing found with name
o   throws a runtime exception if name not found in phonebook
o   prototype:
const PhoneNumber& find(const Name&) const;

[nyfan68]

#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;
        }
    }
}