main.cpp
#include <iostream>
#include <cstdlib>
#include <cstring>

#include "product.h"

int main()
{
    ProductArray pa;

    pa.add(Product("balalayka", 803, 100000));
    pa.add(Product("doshirak", 2005, 10000000));
    pa.add(Product("hren", 1994, 100000));
    pa.add(Product("hren 1", 1993, 99999));
    pa.add(Product("kolbasa", 1989, 100000));
    pa.add(Product("", 1233, 100000));
    pa.add(Product("hren", 1994, 100000));

    pa.printMostExp();
    system("pause");

    return 0;
}


product.h

//#ifndef Product_h
#define Product_h

// #define _CRT_SECURE_NO_WARNINGS

#include <vector>

#define NAME_LEN 32
#define ARR_MAX 32

class Product
{
private:
    char *name;
    int year;
    int cost;

public:
    Product();
    ~Product();

    Product(char const * nameNew, int yearNew, int costNew);
    Product(const Product &prod);

    Product &operator=(const Product &prod);

    void setName(char const *nameNew);
    void setYear(int yearNew);
    void setCost(int costNew);

    int getYear() const;
    int getCost() const;
    char const * getName() const;

    void print();
};

class ProductArray
{
private:
    std::vector<Product> arr;

    int yearMax;
public:

    ProductArray();
    void add(Product const & prod);
    void printMostExp();
};


product.cpp

#define _CRT_SECURE_NO_WARNINGS
#include <cstdlib>
#include <cstring>
#include <iostream>

#include "product.h"



Product::Product() : name(NULL)
{
    ;
}

Product::Product(char const *nameNew, int yearNew, int costNew) : name(NULL)
{
    setName(nameNew);
    setYear(yearNew);
    setCost(costNew);
}

Product::Product(const Product &prod)
{
    setName(prod.getName());
    setYear(prod.getYear());
    setCost(prod.getCost());
}

Product::~Product()
{
    delete[] name;
}

Product &Product::operator=(const Product &prod)
{
    setName(prod.getName());
    setYear(prod.getYear());
    setCost(prod.getCost());
    return *this;
}

ProductArray::ProductArray() : yearMax(1995)
{
}

char const * Product::getName() const
{
    return name;
}

void Product::setName(char const *nameNew)
{
    if (name != NULL)
        free(NULL);

    int len = strlen(nameNew);
    name = new char[len + 1];
    strcpy(name, nameNew);

    //strcpy_s(name, len, nameNew);
}

void Product::setYear(int yearNew)
{
    year = yearNew;
}

void Product::setCost(int costNew)
{
    cost = costNew;
}

void Product::print()
{
    std::cout << name << " " << year << " " << cost << " ";
}

int Product::getYear() const
{
    return year;
}

int Product::getCost() const
{
    return cost;
}

void ProductArray::add(Product const &prod)
{
    arr.push_back(prod);
}

void ProductArray::printMostExp()
{
    bool isFound = false;
    Product *maxProd = NULL;

    /* search minimal product */
    for (size_t i = 0; i < arr.size(); ++i)
    {
        if (arr[i].getYear() <= yearMax)
        {
            if (!isFound || (arr[i].getCost() > maxProd->getCost()))
            {
                maxProd = &arr[i];
                isFound = true;
            }
        }
    }

    for (size_t i = 0; i < arr.size(); ++i)
    {
        if (arr[i].getYear() <= yearMax)
        {
            if (arr[i].getCost() == maxProd->getCost())
            {
                arr[i].print();
                std::cout << std::endl;
            }
        }
    }
}