ShoppingCart Class

Create variables for ShoppingCart Class

Private: $\_$Customer

Private: $\_$product$1$

Private: $\_$product$2$

Private: $\_$product$3$

Create Constructor that takes in a Customer as an argument

ShoppingCart$($Customer cust$)$

Make sure that the GetCustomerId$()$ returns the same Id as the customer that was put in the argument in the constructor.

Create Methods

GetCustomerId$()$ : int

Returns the customer's id

GetProductById$($int id$)$ : ShoppingCartItem

Returns the product with matching id

AddProduct$($Product prod$)$ : ShoppingCartItem

Runs other add product method with quantity of $1$

AddProduct$($Product prod, int quantity$)$ : ShoppingCartItem

Checks for valid quantity

Checks for product and adds quantity if found

Adds product if new

Returns the product changed or null

RemoveProduct$($Product prod, int quantity$)$ : ShoppingCartItem

Checks for valid quantity

Checks for product and removes quantity if found

Returns the product changed or null

GetTotal$()$ : decimal

returns total of all products

GetProduct$($int prodNum$)$ : ShoppingCartItem

returns the product in the position of prodNumor null