// methods
public override bool Equals(object other)
{
if (!(other is Buyable))
{
return(false);
}
Buyable b = (Buyable)other;
return(prod.Equals(b.prod) && amount == b.amount && leftInStock == b.leftInStock);
}
public Buyable(Buyable other)
{
prod = other.prod;
amount = other.amount;
leftInStock = other.leftInStock;
}