private void BuyItem() { Console.WriteLine(); Console.WriteLine("How many would you like to buy"); int quantity = SetQuantity(); // enforces cargo capacity. if (MyShip.GetCargoWeight() <= (MyShip.GetCargoCapacity() - (150 * quantity)) && quantity > 0 && quantity <= 10) { Console.Clear(); // displays credit change and prompts user for confirmation. Console.WriteLine($"This transaction will leave you with {MyShip.GetCredits() - (175 * quantity)} credits. Proceed?"); Console.WriteLine(); Console.WriteLine("1 = Yes, 2 = No"); Console.WriteLine(); try { int option = Int32.Parse(Console.ReadLine()); if (option == 1) { // deducts credits MyShip.ChangeCredits(-175 * quantity); // first parameter selects location dependent item MyShip.ChangeItem(MyShip.GetItemID(), quantity); // adds weight to cargo MyShip.ChangeWeight(150 * quantity); Console.Clear(); Console.WriteLine($"Item purchased. Current credits = {MyShip.GetCredits()}."); } else { Console.Clear(); } } catch (Exception) { MainError(); } } else { Console.Clear(); WeightError(); } }