классы (стр 35 задание 7)

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>

using namespace std;


ifstream fin("input.txt");

class Goods {
protected:
    string name;
    double cost;
    string made;
    int age;
    int type;

public:
    virtual void show() = 0;
    void printType()
    {
        if (type == 1)
            cout << "Toy\n";
        if (type == 2)
            cout << "Book\n";
        if (type == 3)
            cout << "Sports Equipment\n";

    }
    Goods(string name, double cost, string made, int age)
        : name(name), cost(cost), made(made), age(age) {};

};
//Toy(название, цена, производитель, материал,возраст, на который рассчитана),
class Toy : public Goods
{
    string material;
public:

    Toy(string name, double cost, string made, int age, string material)
        :Goods(name, cost, made, age), material(material) {
        type = 1;
    };
    void show() override
    {
        cout << name << ' ' << cost << ' ' << made << ' ' << age
            << ' ' << material << endl << endl;
    }

};
//, Book (название, автор, цена, издательство, возраст, на который рассчитана)
class Book : public Goods {
    string autor;
public:
    Book(string name, double cost, string made, int age, string autor)
        :Goods(name, cost, made, age), autor(autor) {
        type = 2;
    };
    void show() override
    {
        cout << name << ' ' << cost << ' ' << made << ' ' << age
            << ' ' << autor << endl << endl;
    }
};
// SportsEquipment (название, цена, производитель, возраст, на который рассчитан).

class SportsEquipment : public Goods {
public:
    SportsEquipment(string name, double cost, string made, int age)
        :Goods(name, cost, made, age) {
        type = 3;
    };
    void show() override
    {
        cout << name << ' ' << cost << ' ' << made << ' ' << age
            << endl;
    }
};
const int MAXSIZE = 100;
int main()
{
    /*
    3
    1 MyFistToy 666 Russia 18 LaTeX
    2 MyFirstMatAnTime 228 USA 50 Sahno
    3 MyFirstSki 333 France 4
    */
    int n;
    fin >> n;
    Goods* a[MAXSIZE];
    for (int i = 0; i < n; ++i)
    {
        int type;

        fin >> type;
        string name, made;
        double cost;
        int age;
        string feature;
        fin >> name >> cost >> made >> age;
        if (type != 3)
            fin >> feature;
        if (type == 1)
            a[i] = new Toy(name, cost, made, age, feature);
        if (type == 2)
            a[i] = new Book(name, cost, made, age, feature);
        if (type == 3)
            a[i] = new SportsEquipment(name, cost, made, age);
    }
    for (int i = 0; i < n; ++i)
    {
        a[i]->show();
        cout << "It's a ";
        a[i]->printType();
        cout << endl;
    }
}