Snackbar

Learning Goals

  • Practice using structs
  • Write a linear search algorithm

Beach Image

Background

Imagine you’re at the beach and want to order a number of items from the snack bar. You have a limited amount of cash on you, and you want to get a total cost for your items before ordering. In snackbar.c you will complete two functions. First is add_items which will add at least the first 4 items on the Beach Burger Shack menu. Then you will complete get_cost which will implement a linear search algorithm to search for each item you choose, and return the correstponding price.

  • Hints
    • You can hard code the menu items and prices in the add_items function.
    • There is a function in strings.h that may come in handy here.

Demo

Getting Started

  1. Log into code.cs50.io using your GitHub account.
  2. Click inside the terminal window and execute cd.
  3. Execute wget https://cdn.cs50.net/2022/fall/labs/3/snackbar.zip followed by Enter in order to download a zip called snackbar.zip in your codespace. Take care not to overlook the space between wget and the following URL, or any other character for that matter!
  4. Now execute unzip snackbar.zip to create a folder called snackbar.
  5. You no longer need the ZIP file, so you can execute rm snackbar.zip and respond with “y” followed by Enter at the prompt.
  6. Finally, right-click or control-click on the snackbar folder and click “Open in CS50 Lab”. You should see the specification for this problem on the left-hand side and its distribution code on the right-hand side.

Implementation Details

The main function is already complete. After calling add_items to initialize the menu array, it will print out the menu items and their prices, prompting you to keep selecting items until you press enter without typing anything in. You are to complete two functions, add_items, which adds at least the first four menu items, and get_cost to return the cost of each item. When you are creating a linear search algorithm in get_cost, do make sure that it is case insentive.

Thought Question

  • Why is an array of structs a better solution here than multiple arrays?

How to Test Your Code

Your program should behave as follows:

snackbar/ $ ./snackbar

Welcome to Beach Burger Shack!
Choose from the following menu to order. Press enter when done.

Burger: $9.50
Vegan Burger: $11.00
Hot Dog: $5.00
Cheese Dog: $7.00
Fries: $5.00
Cheese Fries: $6.00
Cold Pressed Juice: $7.00
Cold Brew: $3.00
Water: $2.00
Soda: $2.00

Enter a food item: burger
Enter a food item: fries
Enter a food item: soda
Enter a food item: 

Your total cost is: $16.50

snackbar/ $ ./snackbar

Welcome to Beach Burger Shack!
Choose from the following menu to order. Press enter when done.

Burger: $9.50
Vegan Burger: $11.00
Hot Dog: $5.00
Cheese Dog: $7.00
Fries: $5.00
Cheese Fries: $6.00
Cold Pressed Juice: $7.00
Cold Brew: $3.00
Water: $2.00
Soda: $2.00

Enter a food item: cold brew
Enter a food item: hot dog
Enter a food item: 

Your total cost is: $8.00

Note that the menu should only print out the items that you saved in the menu array.

No check50 for this one!

To evaluate that the style of your code, type in the following at the $ prompt.

style50 snackbar.c

How to Submit

No need to submit! This is an optional practice problem.