Question

7.7 Ch 7 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 struct to contain a new data member. (2 pt)

• char itemDescription[ ] - set to "none" in MakeItemBlank()

Implement the following related functions for the ItemToPurchase struct.

• PrintItemDescription()
  • Has an ItemToPurchase parameter.

Ex. of PrintItemDescription() output:

Bottled Water: Deer Park, 12 oz.

(2) Create three new files:

• ShoppingCart.h - struct definition and related function declarations
• ShoppingCart.c - related function definitions
• main.c - main() function (Note: main()'s functionality differs from the warm up)

Build the ShoppingCart struct with the following data members and related functions. Note: Some can be function stubs (empty functions) initially, to be completed in later steps.

• Data members (3 pts)
  • char customerName [ ]
  • char currentDate [ ]
  • ItemToPurchase cartItems [ ] - has a maximum of 10 slots (can hold up to 10 items of any quantity)
  • int cartSize - the number of filled slots in array (number of items in cart of any quantity)
• Related functions
  • AddItem()
    • Adds an item to cartItems array. Has parameters ItemToPurchase and ShoppingCart. Returns ShoppingCart object.
  • RemoveItem()
    • Removes item from cartItems array (does not just set quantity to 0; removed item will not take up a slot in array). Has a char[ ](an item's name) and a ShoppingCart parameter. Returns ShoppingCart object.
    • 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 parameters ItemToPurchase and ShoppingCart. Returns ShoppingCart object.
  • GetNumItemsInCart() (2 pts)
    • Returns quantity of all items in cart. Has a ShoppingCart parameter.
  • GetCostOfCart() (2 pts)
    • Determines and returns the total cost of items in cart. Has a ShoppingCart parameter.
  • PrintTotal()
    • Outputs total of objects in cart. Has a ShoppingCart parameter.
    • If cart is empty, output this message: SHOPPING CART IS EMPTY
  • PrintDescriptions()
    • Outputs each item's description. Has a ShoppingCart parameter.

Ex. of PrintTotal() output:

John Doe's Shopping Cart - February 1, 2016
Number of Items: 8

Nike Romaleos 2 @ $189 = $378
Chocolate Chips 5 @ $3 = $15
Powerbeats 2 Headphones 1 @ $128 = $128

Total: $521

Ex. of PrintDescriptions() output:

John Doe's Shopping Cart - February 1, 2016

Item Descriptions
Nike Romaleos: Volt color, Weightlifting shoes
Chocolate Chips: Semi-sweet
Powerbeats Headphones: Bluetooth headphones

(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.

Enter Customer's Name:
John Doe
Enter Today's Date:
February 1, 2016

Customer Name: John Doe
Today's Date: February 1, 2016

(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:

MENU
a - Add item to cart
r - Remove item from cart
c - Change item quantity
i - Output items' descriptions
o - Output shopping cart
q - Quit

Choose an option:

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

Ex:

OUTPUT SHOPPING CART
John Doe's Shopping Cart - February 1, 2016
Number of Items: 8

Nike Romaleos 2 @ $189 = $378
Chocolate Chips 5 @ $3 = $15
Powerbeats Headphones 1 @ $128 = $128

Total: $521

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

Ex.

OUTPUT ITEMS' DESCRIPTIONS
John Doe's Shopping Cart - February 1, 2016

Item Descriptions
Nike Romaleos: Volt color, Weightlifting shoes
Chocolate Chips: Semi-sweet
Powerbeats Headphones: Bluetooth headphones

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

Ex:

ADD ITEM TO CART
Enter the item name:
Nike Romaleos
Enter the item description:
Volt color, Weightlifting shoes
Enter the item price:
189
Enter the item quantity:
2

(8) Implement the "Remove item from cart" menu option. (4 pts)

Ex:

REMOVE ITEM FROM CART
Enter name of item to remove:
Chocolate Chips

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

Ex:

CHANGE ITEM QUANTITY
Enter the item name:
Nike Romaleos
Enter the new quantity:
3

Answer 1

Working code implemented in C and appropriate comments provided for better understanding:

Here I am attaching code for these files:

• main.c
• ItemToPurchase.c
• ItemToPurchase.h
• ShoppingCart.c
• ShoppingCart.h

Source code for main.c:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ShoppingCart.h"
#include "ItemToPurchase.h"

#define CUST_NAME_LEN 50
#define CURR_DATE_LEN 20
#define ITEM_NAME_LEN 50
#define ITEM_DESC_LEN 100

void PrintMenu(ShoppingCart cart);
ShoppingCart MenuAddItem(ShoppingCart cart);
ShoppingCart MenuRemoveItem(ShoppingCart cart);
ShoppingCart MenuChangeItemQty(ShoppingCart cart);
void MenuPrintDescriptions(ShoppingCart cart);
void MenuOutputCart(ShoppingCart cart);

int main(int argc, char const *argv[]) {
// Declare variables
char name[CUST_NAME_LEN];
char date[CURR_DATE_LEN];
char choice = ' ';
char tmp;
ShoppingCart cart;

// Take user input: customer name
printf("Enter Customer's Name:\n");
fgets(name, CUST_NAME_LEN, stdin);
name[strlen(name) - 1] = '\0';

// Take user input: current date
printf("Enter Today's Date:\n");
fgets(date, CURR_DATE_LEN, stdin);
date[strlen(date) - 1] = '\0';

// Initialize ShoppingCart
strcpy(cart.customerName, name);
strcpy(cart.currentDate, date);
cart.cartSize = 0;

// Print initial information
printf("\nCustomer Name: %s\n", cart.customerName);
printf("Today's Date: %s\n\n", cart.currentDate);

PrintMenu(cart);
do {
printf("Choose an option:\n");
scanf(" %c%c", &choice, &tmp);

switch (choice) {
case 'q':
break;
case 'a':
cart = MenuAddItem(cart);
PrintMenu(cart);
break;
case 'r':
cart = MenuRemoveItem(cart);
PrintMenu(cart);
break;
case 'c':
break;
case 'i':
MenuPrintDescriptions(cart);
PrintMenu(cart);
break;
case 'o':
MenuOutputCart(cart);
PrintMenu(cart);
break;
default:
break;
}
} while (choice != 'q');

return 0;
}

void PrintMenu(ShoppingCart cart) {
printf("MENU\n");
printf("a - Add item to cart\n");
printf("r - Remove item from cart\n");
printf("c - Change item quantity\n");
printf("i - Output items' descriptions\n");
printf("o - Output shopping cart\n");
printf("q - Quit\n\n");
}

ShoppingCart MenuAddItem(ShoppingCart cart) {
char item_name[ITEM_NAME_LEN];
char item_desc[ITEM_DESC_LEN];
int item_price = 0;
int item_qty = 0;
ItemToPurchase item;

printf("ADD ITEM TO CART\n");

printf("Enter the item name:\n");
fgets(item_name, ITEM_NAME_LEN, stdin);
item_name[strlen(item_name) - 1] = '\0';
strcpy(item.itemName, item_name);

printf("Enter the item description:\n");
fgets(item_desc, ITEM_DESC_LEN, stdin);
item_desc[strlen(item_desc) - 1] = '\0';
strcpy(item.itemDescription, item_desc);

printf("Enter the item price:\n");
scanf("%d", &item_price);
item.itemPrice = item_price;

printf("Enter the item quantity:\n\n");
scanf("%d", &item_qty);
item.itemQuantity = item_qty;

cart = AddItem(item, cart);
return cart;
}

ShoppingCart MenuRemoveItem(ShoppingCart cart) {
char item_name[ITEM_NAME_LEN];

printf("REMOVE ITEM FROM CART\n");
printf("Enter name of item to remove:\n");
scanf(" %s", item_name);
for (int i = 0; i < cart.cartSize; i++) {
if (strcmp(item_name, cart.cartItems[i].itemName) == 0) {
cart = RemoveItem(item_name, cart);
} else {
printf("Item not found in cart. Nothing removed.\n\n");
}
}
return cart;
}

ShoppingCart MenuChangeItemQty(ShoppingCart cart) {
return cart;
}

void MenuPrintDescriptions(ShoppingCart cart) {
printf("OUTPUT ITEMS' DESCRIPTIONS\n");
PrintDescriptions(cart);
}

void MenuOutputCart(ShoppingCart cart) {
printf("OUTPUT SHOPPING CART\n");
PrintTotal(cart);
}

Source code for ItemToPurchase.c:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ItemToPurchase.h"

void MakeItemBlank(ItemToPurchase* item) {
strcpy(item->itemName, "none");
strcpy(item->itemDescription, "none");
item->itemPrice = 0;
item->itemQuantity = 0;
}

void PrintItemCost(ItemToPurchase item) {
printf("%s %d @ $%d = $%d\n"
, item.itemName
, item.itemQuantity
, item.itemPrice
, item.itemPrice * item.itemQuantity
);
}

void PrintItemDescription(ItemToPurchase item) {
printf("%s: %s\n", item.itemName, item.itemDescription);
}

Source code for ItemToPurchase.h:

#ifndef ITEMTOPURCHASE__INC__
#define ITEMTOPURCHASE__INC__

#include <stdio.h>
#include <stdlib.h>

#define ITEM_NAME_LEN 50
#define ITEM_DESC_LEN 100

typedef struct ItemToPurchase {
char itemName[ITEM_NAME_LEN];
char itemDescription[ITEM_DESC_LEN];
int itemPrice;
int itemQuantity;
} ItemToPurchase;

void MakeItemBlank(ItemToPurchase* item);
void PrintItemCost(ItemToPurchase item);
void PrintItemDescription(ItemToPurchase item);

#endif

Source code for ShoppingCart.c:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ShoppingCart.h"

ShoppingCart AddItem(ItemToPurchase item, ShoppingCart cart) {
// Adds an item to cart
cart.cartItems[cart.cartSize] = item;
cart.cartSize++;
return cart;
}

ShoppingCart RemoveItem(char item_name[], ShoppingCart cart) {
// Removes an item from cart
for (int i = 0; i < cart.cartSize; i++) {
if (strcmp(item_name, cart.cartItems[i].itemName) == 0) {
cart.cartItems[i].itemQuantity = 0;
}
}
return cart;
}

ShoppingCart ModifyItem(ItemToPurchase item, ShoppingCart cart) {
// Modifies contents (name, qty, etc.) of an item in cart
return cart;
}

int GetNumItemsInCart(ShoppingCart cart) {
// Returns the total quantity of items in a cart
int count = 0;
for (int i = 0; i < cart.cartSize; i++) {
count += cart.cartItems[i].itemQuantity;
}
return count;
return 0;
}

int GetCostOfCart(ShoppingCart cart) {
// Returns the total cost of items in a cart
int total = 0;
for (int i = 0; i < cart.cartSize; i++) {
total += cart.cartItems[i].itemPrice * cart.cartItems[i].itemQuantity;
}
return total;
}

void PrintTotal(ShoppingCart cart) {
// Outputs total number of items in cart
printf("%s's Shopping Cart - %s\n", cart.customerName, cart.currentDate);
printf("Number of Items: %d\n\n", GetNumItemsInCart(cart));
if (GetNumItemsInCart(cart) == 0) {
printf("SHOPPING CART IS EMPTY\n");
} else {
for (int i = 0; i < cart.cartSize; i++) {
PrintItemCost(cart.cartItems[i]);
}
}
printf("\nTotal: $%d\n\n", GetCostOfCart(cart));
}

void PrintDescriptions(ShoppingCart cart) {
// Outputs each item's description
printf("%s's Shopping Cart - %s\n\n", cart.customerName, cart.currentDate);
printf("Item Descriptions\n");
for (int i = 0; i < cart.cartSize; i++) {
PrintItemDescription(cart.cartItems[i]);
}
printf("\n");
}

Source code for ShoppingCart.h:

#ifndef SHOPPINGCART__INC__
#define SHOPPINGCART__INC__

#include <stdio.h>
#include <stdlib.h>
#include "ItemToPurchase.h"

#define CUST_NAME_LEN 50
#define CURR_DATE_LEN 20
#define MAX_CART_SIZE 10

typedef struct ShoppingCart {
char customerName[CUST_NAME_LEN];
char currentDate[CURR_DATE_LEN];
int cartSize;
ItemToPurchase cartItems[MAX_CART_SIZE];
} ShoppingCart;

ShoppingCart AddItem(ItemToPurchase item, ShoppingCart cart); // Adds an item to cart
ShoppingCart RemoveItem(char item_name[], ShoppingCart cart); // Removes an item from cart
ShoppingCart ModifyItem(ItemToPurchase item, ShoppingCart cart); // Modifies contents (name, qty, etc.) of an item in cart
int GetNumItemsInCart(ShoppingCart cart); // Returns the total quantity of items in a cart
int GetCostOfCart(ShoppingCart cart); // Returns the total cost of items in a cart
void PrintTotal(ShoppingCart cart); // Outputs total number of items in cart
void PrintDescriptions(ShoppingCart cart); // Outputs each item's description

#endif

Output Screenshots:

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