Разработать класс "Product" с полями Наименование, Производитель, Цена, Срок хранения, Дата выпуска

class Product
{
private:
    string name;
    string vendor;
    unsigned long price;    //in cents
    unsigned long storeFor; //in seconds
    time_t produced;
 
public:
    Product() :
        name("No name"),
        vendor("No vendor"),
        price(0),
        storeFor(0),
        produced(time(0)) {}
 
    void setName(const string& value) { name = value; }
    string getName(void) { return name; }
 
    void setVendor(const string& value) { vendor = value; }
    string getVendor(void) { return vendor; }
 
    void setPrice(const unsigned long& value) { price = value; }
    unsigned long getPrice(void) { return price; }
 
    void setStoreFor(const unsigned long& value) { storeFor = value; }
    unsigned long getStoreFor(void) { return storeFor; }
 
    void setProduced(const time_t& value) { produced = value; }
    time_t getProduced(void) { return produced; }
 
    void show(void) const
    {
        cout << "Name: " << name.c_str() << endl;
        cout << "Vendor: " << vendor.c_str() << endl;
        cout << "Price: " << (double)price / 100. << endl;
        unsigned long buf = storeFor / (60*60*24); //days
        cout << "Store for: " << buf << " days ";
        buf = (storeFor - buf*24*60*60) / (60*60); //hours
        cout << buf << " hours" << endl;
        cout << "Produced: " << ctime(&produced) << endl;
    }
 
    bool isValid(void) const
    {
        time_t now = time(0);
        return now > produced + storeFor ? false : true;
    }
};
 
int main()
{
    Product milk;
    milk.setName(string("Milk"));
    milk.setVendor(string("Happy Milkman ltd."));
    milk.setPrice(5797);
    milk.setProduced(time(0));
    milk.setStoreFor(446400);
    milk.show();
    if (milk.isValid())
        cout << "Good" << endl;
    else
        cout << "Wasted" << endl;
 
    Product bad;
    bad.show();
}