Object-Oriented Programming in C++

Class definition

// the header containing the object information
#include <string>

using namespace std;

class person {
    public:
        person() { nptr = NULL; }
        ~person() { delete nptr; }
        string getData(int getOption) {
            switch(getOption) {
                case 0: return firstName;
                case 1: return lastName;
                case 2: return place;
                case 3: return phone;
            }
        }
        void setPerson(string getString[]) {
            firstName = getString[0];
            lastName = getString[1];
            place = getString[2];
            phone = getString[3];
        }
        person *nptr;
    private:
        string firstName;
        string lastName;
        string place;
        string phone;
};

Create a object

// the main programming body use the header containing the object information    
#include <iostream>
#include <cstdlib>
#include <string>
#include <fstream>
#include "person.h"

using namespace std;

int main(int argv, char* args[]) {
    ifstream fin("input.txt");
    if(!fin) { 
        cerr << "File error." << endl; 
        return 1; 
    }

    string saveData[4];
    person *head = new person(), *find = new person();

    while(fin >> saveData[0]) {
        for(int i = 1 ; i <= 3 ; i++) {
            fin >> saveData[i];
        }
        person *newPerson = new person();
        newPerson->setPerson(saveData);
        if(! head->nptr) {
            head->nptr = newPerson;
        }
        else {
            find = head;
            while(find->nptr) {
                find = find->nptr;
            }
            find->nptr = newPerson;
        }
    }

    find = head;
    while(find->nptr) {
        for(int i = 0 ; i < 4; i++) {
            cout << find->nptr->getData(i);
            switch(i) {
                case 3: cout << endl; break;
                default: cout << "\t"; break;
            }
        }
        find = find->nptr;
    }
    fin.close();
    return 0;
}