Small Class Example

Does anyone know why this will not display the name to the console? If I call A.getName(); in the addContact function itself it will retrieve the name correctly, however I believe it deletes itself after the function addContact ends. Can anyone spot where I went wrong?

Code:

#include <iostream>

using namespace std;

class Phonebook {
    private:
    string Name;
    public:
    void menu();
    void setName(string);
    string getName(){return Name;}
    void addContact(Phonebook);
    void printContacts(Phonebook);
};

void Phonebook::menu(){
    cout << "Phonebook Menu" << endl;
    cout << "(1) Add Contact" << endl;
    cout << "Choose an option: ";
}

void Phonebook::setName(string s){
    Name = s;
}

void Phonebook::addContact(Phonebook A){
    string s;
    cout << "\n\n[Add Contact]" << endl;
    cout << "Name: ";
    cin >> s;
    A.setName(s);
}

void Phonebook::printContacts(Phonebook A){
    cout << "\n\n[Contact List]" << endl;
    cout << A.getName() << endl;
}

int main(){
    Phonebook A;
    int option = 0;

    A.menu();

    cin >> option;

    switch(option){
        case 1:
        A.addContact(A);
        A.printContacts(A);
        break;
    }

    return 0;
}

Edit: I was able to make it print the name correctly, I still have a question though. How can I make it store more than one name?

New Code:

Code:

#include <iostream>

using namespace std;

class Phonebook {
    private:
    string Name;
    public:
    void menu();
    void setName(string);
    string getName(){return Name;}
    void addContact(Phonebook *);
    void printContacts(Phonebook);
};

void Phonebook::menu(){
    cout << "Phonebook Menu" << endl;
    cout << "(1) Add Contact" << endl;
    cout << "Choose an option: ";
}

void Phonebook::setName(string s){
    Name = s;
}

void Phonebook::addContact(Phonebook * A){
    string s;
    cout << "\n\n[Add Contact]" << endl;
    cout << "Name: ";
    cin >> s;
    A->setName(s);
}

void Phonebook::printContacts(Phonebook A){
    cout << "\n\n[Contact List]" << endl;
    cout << A.getName() << endl;
}

int main(){
    Phonebook A;
    int option = 0;

    A.menu();

    cin >> option;

    switch(option){
        case 1:
        A.addContact(&A);
        A.printContacts(A);
        break;
    }

    return 0;
}

Code:

string Name;

this is enough for one string

This is enough for ten strings

Code:

string arrayNames[10];

When I try to convert the

Code:

string Name;

to

Code:

string Name[10];

I get the following error

Line: 11

Code:

error: could not convert '(std::string*)(&((Phonebook*)this)->Phonebook::Name)' from 'std::string* {aka std::basic_string<char>*}' to 'std::string {aka std::basic_string<char>}'

This will work (general example)

Code:

#include <iostream>
#include <string>

using namespace std;

int main() {

    string Name[10];

    Name[0] = "Samaras";

    cout<<Name[0]<<endl;

    return 0;


}

Where do you get the error?

I am guessing at a line of code that you treat Name as it was before (just a string), like you do here

Code:

void Phonebook::setName(string s){
    Name = s;
}

You should treat Name as an array, because this is what Name is. An array of strings .

Every time you make a call to an array you have to include a [] with the number of the member you want - 1, starting with 0. For example, if I wanted the first member of name[10] I would have to write name[0], if I want the second it is name[1], name[2] for the third, and so on up to name[9].

edit: ninja'd

You should not be passing in a Phonebook object (or pointer to one) in your member functions. Instead of:

Code:

    switch(option){
        case 1:
        A.addContact(A);
        A.printContacts(A);
        break;
    }

It should be:

Code:

    switch(option){
        case 1:
        A.addContact();
        A.printContacts();
        break;
    }

And the individual member functions should be changed to accommodate this revision.

---

From a design standpoint, a Phone Book contains data on individuals (name, phone number, address, etc...). This would suggest that you have a "person" object which stores the name, phone number... and then your Phonebook class stores an array (or more usefully a std::vector) of such person objects:

Code:

class Person
{
    std::string firstname;
    std::string lastname;
    std::string phone_number;
    ...
};

class Phonebook
{
    std::vector<Person> entries;
    ...
};