Problem Description (to be solved in C++): When shopping online, you select item

ID: 3586138 • Letter: P

Question

Problem Description (to be solved in C++):
When shopping online, you select items and add them to a shopping cart. Duplicate items are permitted in a shopping cart, as you can purchase multiples of the same item. You also can remove an item from a shopping cart, if you change your mind about buying it. The shopping cart can show its current contents with their prices and the total cost of these items. Design the ADT item and shopping cart.

Requirements
Shopping cart
o Design the shopping cart as a derived class from the Bag class
o Declare total price as a data member
o Define a default constructor
o Define a member function to get the total price
o Override the base class methods: add and remove

Item
Declare three data members: name of item, unit price of item, quantity of item
Define a default constructor
Define a constructor that initializes all three data members by the parameters.
Define set and get functions for each data member.
Define the following operators:
Equal to: ==
Input : >>
Output: <<

Write and document the class in header and implementation files, and compile it separately from the client program.

Explanation / Answer

#include <iostream>

#include <vector>

#include <cstring>

#include <string.h>

using namespace std;

//Class Item definition

class Item

{

private:

//Data member to store name

string name;

//Data member to store quantity

int quantity;

//Data member to store price

double price;

public:

//Default constructor

Item()

{

name = "";

quantity = 0;

price = 0;

}//End of constructor

//Parameterized constructor

Item(string n, int q, double p)

{

name = n;

quantity = q;

price = p;

}//End of constructor

//Function to Set name

void setName(string itemName)

{

name = itemName;

}//End of function

//Function to Set price

void setPrice(double itemPrice)

{

price = itemPrice;

}//End of function

//Function to Set quantity

void setQuantity(int itemQuantity)

{

quantity = itemQuantity;

}//End of function

//Function to return name

string getName()

{

return name;

}//End of function

//Function to return price

double getPrice()

{

return price;

}//End of function

//Function to return quantity

int getQuantity()

{

return quantity;

}//End of function

};//End of class

//Class definition

class ShoppingCart

{

private:

//Data member object to store item class objects

vector<Item> item;

//To store total price

int total_price;

public:

//Prototype of member functions

ShoppingCart();

void addItem(string name, int quantity, int price);

void removeItem(string name, int quantity);

int getTotal();

void displayItems();

};//End of class

//Default constructor

ShoppingCart::ShoppingCart()

{

cout << " Creating a new shopping cart" << endl;

total_price = 0;

}//End of constructor

//Function to add an item to the shopping cart

void ShoppingCart::addItem(string name, int quantity, int price)

{

//Loops till size of the list

for (int i = 0; i < item.size(); i++)

{

//Checks the current item name with name given

if (item[i].getName() == name)

{

//If it is present then updates the quantity

item[i].setQuantity(item[i].getQuantity() + quantity);

return;

}//End of if

}//End of for

//Creates an temporary object of Item class

Item temp;

//Set the information for the new item

temp.setName(name);

temp.setQuantity(quantity);

temp.setPrice(price);

//Add it to the cart

item.push_back(temp);

}//End of function

//Function to remove an specified item from the shopping cart

void ShoppingCart::removeItem(string name, int quantity)

{

//Loops till the size of the item list

for (int i = 0; i < item.size(); i++)

{

//Compares the current item name with the name specified

if (item[i].getName() == name)

{

//Checks the current quantity is greater than or equals to the specified quantity

if (item[i].getQuantity() >= quantity)

{

//Update the quantity

item[i].setQuantity(item[i].getQuantity() - quantity);

return;

}//End of inner if

//If current quantity is less than the specified quantity

//Displays the message enough quantity is not found

cout << " Not enough items present in the cart to be removed" << endl;

return;

}//End of outer if

}//End of for

//If item not found displays the following message

cout << " This following item is not present in the cart: " << endl;

cout<<" Name: "<<name<<" Quantity: "<<quantity<<endl;

}//End of function

//Function to calculate and return total price

int ShoppingCart::getTotal()

{

//Initializes to zero

total_price = 0;

//Loops till size of the item list

for (int i = 0; i < item.size(); i++)

{

//Calculate the total

total_price += item[i].getQuantity()* item[i].getPrice();

}//End of for

//Returns the total price

return total_price;

}//End of function

//Function to display the Item in the shopping cart list

void ShoppingCart::displayItems()

{

cout<<" ********************* Item Information *********************** ";

//Loops till size of the item

for (int i = 0; i < item.size(); i++)

{

cout<<" Name: "<<item[i].getName()<<" Quantity: "<<item[i].getQuantity()<<" Price: "<<item[i].getPrice();

}//End of for

}//End of function

//Main function definition

int main()

{

//Creates an object of the shopping cart class

ShoppingCart cart;

//Adds an item to shopping cart

cart.addItem("Maggi", 10, 5);

//Displays the item list

cart.displayItems();

//Adds an item to shopping cart

cart.addItem("Biryani", 2, 15);

//Displays the item list

cart.displayItems();

//Adds an item to shopping cart

cart.addItem("Ketchup", 1, 5);

//Displays the item list

cart.displayItems();

cout << " Total cost: " << cart.getTotal() << endl;

//Adds an item to shopping cart

cart.addItem("Football", 2, 15);

cout << " Total cost: " << cart.getTotal() << endl;

//Displays the item list

cart.displayItems();

//Removes an item from shopping cart

cart.removeItem("Maggi", 4);

cout << " Total cost: " << cart.getTotal() << endl;

//Displays the item list

cart.displayItems();

//Removes an item from shopping cart

cart.removeItem("Ketchup", 2);

cout << " Total cost: " << cart.getTotal() << endl;

//Displays the item list

cart.displayItems();

//Adds an item to shopping cart

cart.addItem("Candy", 15, 2);

cout << " Total cost: " << cart.getTotal() << endl;

//Displays the item list

cart.displayItems();

//Removes an item from shopping cart

cart.removeItem("Bat", 1);

//Displays the item list

cart.displayItems();

cout << " Total cost: " << cart.getTotal() << endl;

}//End of function

Sample Run:

Creating a new shopping cart