address book class members

How can i make it so that a user can create as many new entries as theywant, then delete any that they don't need anymore. I know this has to do with construtors and deconstructors, but i don't know how to get them to work. here's my code as of now.
thanksin advance
-ASCII14

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//
//  main.cpp
//  address book
//
//  Copyright 2014 jesse smith. All rights reserved.


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

int c;
int total_a = 0;
string user_c;

class addr
{
public:
    addr()
    {
        
    }
    
    addr(string first_n, string last_n, double p_numb, char sex)
    {
        f_name = first_n;
        l_name = last_n;
        phone = p_numb;
        gender = sex;
    }
    ~addr()
    {
        delete f_name;
        delete l_name;
        delete phone;
        delete gender;
    }
private:
    string f_name;
    string l_name;
    double phone;
    char gender;
    
    
};
  

string intro(char first);
string intro(char first)
{
    if (first == 'f')
    {
        cout<<"create a new address"<<endl;
        cout<<"browse the addresses"<<endl;
        cout<<"delete an address"<<endl;
        cout<<"exit the program"<<endl;
    }
    if (first == 'n')
    {
        cout<<"create"<<endl;
        cout<<"browse"<<endl;
        cout<<"delete"<<endl;
        cout<<"exit"<<endl;    
    }
    cin >> user_c;
    return user_c;    
    
}

void decoder(string command);
void decoder(string command)
{
    if (command == "create")c = 1;
    else if (command == "browse")c = 2;
    else if (command == "delete")c = 3;
    else if (command == "exit")c = 4;
}

void pr_create();
void pr_create()
{
    total_a += 1;
    
}

void pr_browse();
void pr_browse()
{
    
}

void pr_delete();
void pr_delete()
{
    if (total_a == 0)
    {
        cout<<"you don't have any addresses to delete!" <<endl;
    }
    total_a -= 1;
}

int execute(int c);
int execute(int c)
{
    switch (c)
    {
        case 1:
            pr_create();
            return 1;
            break;
        case 2:
            pr_browse();
            return 1;
            break;
        case 3:
            pr_delete();
            return 1;
            break;
        case 4:
            return 0;
            break;
        default:
            return 0;
            break;
    }
}

int main ()
{
    bool pr_run = true;
    while (pr_run == true)
    {
        if (total_a == 0)
        {
            cout<<"you have no current addresses"<<endl;
            intro('f');
        }
        else
        {
            intro('n');
        }
        decoder(user_c);
        execute(c);
        if (execute(c) == 0){
            cout << "closing..." <<endl;
            pr_run = false;
        }
    }    
    return 0;
}
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