create an array of class objects in c++

Question

Hi guys I want to make an array of class objects....so that I can keep on creating as many objects during runtime as and when required I wrote the following code, but its giving me error:

class contact{
public:
    string name;//ALL CLASS VARIABLES ARE PUBLIC
    int phonenumber;
    string address;

    contact(){//Constructor
        name= NULL;
        phonenumber= NULL;
        address= NULL;
    }

    void input_contact_name(string s){//function to take contact name
        name=s;
    }
    void input_contact_number(int x){//function to take contact number
        phonenumber=x;
    }
    void input_contact_address(string add){//function to take contact address
        address=add;
    }
}

int main(){
    contact *d;
    d= new contact[200];
    string name,add;
    int choice;//Variable for switch statement
    int phno;
    static int i=0;//i is declared as a static int variable
    bool flag=false;
    cout<<"\tWelcome to the phone Directory\n";//Welcome Message
    cout<<"Select :\n1.Add New Contact\n2.Update Existing Contact\n3.Delete an Existing Entry\n4.Display All Contacts\n5.Search for a contact\n6.Exit PhoneBook\n\n\n";//Display all options
    cin>>choice;//Input Choice from user
    while(!flag){//While Loop Starts
        switch(choice){//Switch Loop Starts
        case 1:
            cout<<"\nEnter The Name\n";
            cin>>name;
            d[i]->name=name;
            cout<<"\nEnter the Phone Number\n";
            cin>>phno;
            d[i]->input_contact_number(phno);
            cout<<"\nEnter the address\n";
            cin>>add;
            d[i]->input_contact_address(add);
            i++;
            flag=true;
        }
    }
    return 0;
}

Please can some one out figure out the reason?? Thanks in advance

what is the error you are getting? have you considered using std::vector? — Naveen
– Naveen, Commented Apr 15, 2011 at 9:26
newpro.cpp: In constructor ‘contact::contact()’: newpro.cpp:16: error: ambiguous overload for ‘operator=’ in ‘((contact*)this)->contact::name = 0’ newpro.cpp: At global scope: newpro.cpp:7: error: new types may not be defined in a return type newpro.cpp:7: note: (perhaps a semicolon is missing after the definition of ‘contact’) newpro.cpp:32: error: two or more data types in declaration of ‘main’ — Frustrated Coder
– Frustrated Coder, Commented Apr 15, 2011 at 9:28

ildjarn · Accepted Answer · 2011-04-15 09:43:44Z

6

Many problems:

Missing semicolon on the closing brace of the class, as maverik noted
Use of string without using namespace std; or using std::string; (or #include <string> for that matter)
Ditto #2 for cin and cout (and <iostream>)
d[i]-> is wrong; d[i] is a contact&, not a contact*, so use . instead of ->
name= NULL; and address= NULL; are nonsensical -- string is not a pointer type, and already default-constructs to empty
phonenumber= NULL; is technically valid, but still 'wrong'

Also, good lord, use some whitespace in your code.

EDIT (in response to comment): Your constructor should look like:

contact() : phonenumber() { }

edited Apr 15, 2011 at 9:43

answered Apr 15, 2011 at 9:30

ildjarn

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4 Comments

Frustrated Coder Over a year ago

so what should assign these to in the constrictor?\

ildjarn Over a year ago

@Frustrated Coder : Edited to answer that.

Frustrated Coder Over a year ago

phonenumber is a variable not a function

ildjarn Over a year ago

@Frustrated Coder : Yep, but that's not a function call, that's a constructor initialization list + value-initialization. But, if it makes more sense to you, contact() : phonenumber(0) { } is fine too.

maverik · Accepted Answer · 2011-04-15 09:26:14Z

1

You forget the ;

class contact {
    ...
};  // <- ; is neccessary

answered Apr 15, 2011 at 9:26

maverik

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