Program: Online shopping cart (continued) (C++) This program extends the earlier

Question

Program: Online shopping cart (continued) (C++)

This program extends the earlier "Online shopping cart" program. (Consider first saving your earlier program).

(1) Extend the ItemToPurchase class per the following specifications:

Parameterized constructor to assign item name, item description, item price, and item quantity (default values of 0). (1 pt)

Public member functions

SetDescription() mutator & GetDescription() accessor (2 pts)

PrintItemCost() - Outputs the item name followed by the quantity, price, and subtotal

PrintItemDescription() - Outputs the item name and description

Private data members

string itemDescription - Initialized in default constructor to "none"

Ex. of PrintItemCost() output:

Ex. of PrintItemDescription() output:

(2) Create three new files:

ShoppingCart.h - Class declaration

ShoppingCart.cpp - Class definition

main.cpp - main() function (Note: main()'s functionality differs from the warm up)

Build the ShoppingCart class with the following specifications. Note: Some can be function stubs (empty functions) initially, to be completed in later steps.

Default constructor

Parameterized constructor which takes the customer name and date as parameters (1 pt)

Private data members

string customerName - Initialized in default constructor to "none"

string currentDate - Initialized in default constructor to "January 1, 2016"

vector < ItemToPurchase > cartItems

Public member functions

GetCustomerName() accessor (1 pt)

GetDate() accessor (1 pt)

AddItem()

Adds an item to cartItems vector. Has parameter ItemToPurchase. Does not return anything.

RemoveItem()

Removes item from cartItems vector. Has a string (an item's name) parameter. Does not return anything.

If item name cannot be found, output this message: Item not found in cart. Nothing removed.

ModifyItem()

Modifies an item's description, price, and/or quantity. Has parameter ItemToPurchase. Does not return anything.

If item can be found (by name) in cart, check if parameter has default values for description, price, and quantity. If not, modify item in cart.

If item cannot be found (by name) in cart, output this message: Item not found in cart. Nothing modified.

GetNumItemsInCart() (2 pts)

Returns quantity of all items in cart. Has no parameters.

GetCostOfCart() (2 pts)

Determines and returns the total cost of items in cart. Has no parameters.

PrintTotal()

Outputs total of objects in cart.

If cart is empty, output this message: SHOPPING CART IS EMPTY

PrintDescriptions()

Outputs each item's description.

Ex. of PrintTotal() output:

Ex. of PrintDescriptions() output:

(3) In main(), prompt the user for a customer's name and today's date. Output the name and date. Create an object of type ShoppingCart. (1 pt)

Ex.

(4) Implement the PrintMenu() function. PrintMenu() has a ShoppingCart parameter, and outputs a menu of options to manipulate the shopping cart. Each option is represented by a single character. Build and output the menu within the function.

If the an invalid character is entered, continue to prompt for a valid choice. Hint: Implement Quit before implementing other options. Call PrintMenu() in the main() function. Continue to execute the menu until the user enters q to Quit. (3 pts)

Ex:

(5) Implement Output shopping cart menu option. (3 pts)

Ex:

(6) Implement Output item's description menu option. (2 pts)

Ex.

(7) Implement Add item to cart menu option. (3 pts)

Ex:

(8) Implement remove item menu option. (4 pts)

Ex:

(9) Implement Change item quantity menu option. Hint: Make new ItemToPurchase object and use ItemToPurchase modifiers before using ModifyItem() function. (5 pts)

Ex:

Explanation / Answer

#include <iostream.h>
#include <vector>
#include <cstring.h>

struct Item {
   string name;
   int quantity;
   int price;
};

class SCard {
private:
   vector<Item> item;
   int total_price;
public:
   SCard();
   void addItem(string name, int quantity, int price);
   void removeItem(string name, int quantity);
   int getTotal();
};

SCard::SCard() {
   cout << "Creating a new shopping cart" << endl;
   total_price = 0;
}

void SCard::addItem(string name, int quantity, int price) {
   for (int i = 0; i < item.size(); i++) {
       if (item[i].name == name) {
           item[i].quantity += quantity;
           return;
       }
   }

   Item temp;
   temp.name = name;
   temp.quantity = quantity;
   temp.price = price;
   item.push_back(temp);
}

void SCard::removeItem(string name, int quantity) {
   for (int i = 0; i < item.size(); i++) {
       if (item[i].name == name) {
           if (item[i].quantity >= quantity) {
               item[i].quantity -= quantity;
               return;
           }
           cout << "Not enough items present in the cart to be removed" << endl;
           return;
       }
   }
   cout << "This item is not present in the cart" << endl;
}

int SCard::getTotal() {
   total_price = 0;
   for (int i = 0; i < item.size(); i++) {
       total_price += item[i].quantity * item[i].price;
   }
   return total_price;
}

int main() {
   SCard cart;
   cart.addItem("Maggi", 10, 5);
   cart.addItem("Biryani", 2, 15);
   cart.addItem("Ketchup", 1, 5);
   cout << "Total cost: " << cart.getTotal() << endl;
   cart.addItem("Football", 2, 15);
   cart.removeItem("Maggi", 4);
   cart.removeItem("Ketchup", 2);
   cout << cart.getTotal() << endl;
   cart.addItem("Candy", 15, 2);
   cart.removeItem("Bat", 1);
   cout << "Total cost: " << cart.getTotal() << endl;
}

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