Labs
Quiz1 Shop

Quiz 1 - Coffee Shop Calculator

Duration: 30 minutes
Total Points: 100 points
Open Book: You may reference lab materials and solutions

Scenario

You’re helping your friend manage their new coffee shop! Create a program that handles customer orders, calculates prices, and provides daily reports.

The Program: Coffee Shop Manager (100 points)

Write a complete Java program called CoffeeShop.java that performs the following tasks:

Part 1: Customer Welcome (15 points)

  • Ask for the customer’s first and last name
  • Create a personalized greeting: “Welcome to Java Beans, [Full Name]!”
  • Count the total number of letters in their full name (no spaces)
  • Display: “Your loyalty number is: [letter count]“

Part 2: Menu and Ordering (25 points)

  • Display this menu: 
    1. Coffee - $3.50
2. Tea - $2.25
3. Muffin - $4.00
4. Sandwich - $6.75
  • Ask the customer to select an item by number (1-4)
  • Use a switch statement to display their selection and price
  • Ask how many of that item they want
  • Calculate and display the subtotal

Part 3: Discount Calculation (25 points)

  • If the loyalty number (from Part 1) is:
    • Even number: Apply 10% discount
    • Odd number greater than 10: Apply 5% discount
    • Otherwise: No discount
  • Calculate the discount amount and final total
  • Display all amounts with 2 decimal places using printf

Part 4: Payment Processing (20 points)

  • Ask the customer how much money they’re paying
  • Calculate the change needed
  • If they don’t pay enough, keep asking for more money until the total is covered
  • Display the change in a formatted way

Part 5: Daily Summary (15 points)

  • Ask if this is order number 1, 2, or 3 of the day
  • Use a switch statement to display:
    • Order 1: “First customer of the day!”
    • Order 2: “Morning rush!”
    • Order 3: “Lunch time!”
    • Default: “Busy day ahead!”

Sample Run:

=== JAVA BEANS COFFEE SHOP ===
Enter your first name: Sarah
Enter your last name: Johnson
Welcome to Java Beans, Sarah Johnson!
Your loyalty number is: 11

MENU:
1. Coffee - $3.50
2. Tea - $2.25  
3. Muffin - $4.00
4. Sandwich - $6.75

Select item (1-4): 1
You selected: Coffee ($3.50)
How many would you like? 2
Subtotal: $7.00

Loyalty discount (5%): -$0.35
Final total: $6.65

Enter payment amount: $10.00
Your change: $3.35

What order number is this today (1-3)? 1
First customer of the day!

Thank you for visiting Java Beans!

Grading Criteria:

  • Puzzle 1 - Name Cipher (15 points): Correctly extracts digits from names and calculates cipher key
  • Puzzle 2 - Memory Bank (25 points): Implements random verification, handles retries, calculates average
  • Puzzle 3 - Pattern Lock (30 points): Complex conditional logic with multiple rules and counting
  • Puzzle 4 - Time Lock (20 points): Time conversion and switch statement implementation
  • Final Challenge (10 points): Multi-step calculation and final condition check

Technical Requirements:

  • Use Scanner for all input operations
  • Apply while or do-while loops for retries and validation
  • Implement nested conditionals and complex logic
  • Use Math.random() for randomization
  • Apply printf for formatted output
  • Extract digits from strings using mathematical operations
  • Convert between data types appropriately
  • Close Scanner when done

Strategy Tips:

  • Break down each puzzle - Don’t try to solve everything at once
  • Test incrementally - Get each puzzle working before moving to the next
  • Use the lab examples - Adapt similar patterns from the lab solutions
  • Focus on logic first - Get the algorithm right, then worry about formatting
  • Handle edge cases - What if cipher key is 0? What if no digits in name?

Hidden Complexity:

This challenge requires you to combine concepts in new ways:

  • String processing + mathematical operations (Puzzle 1)
  • Random numbers + input validation + loops (Puzzle 2)
  • Complex conditional logic + counting + digit manipulation (Puzzle 3)
  • Data conversion + switch statements (Puzzle 4)
  • Multi-variable calculations + final decision logic (Final Challenge)

The real challenge isn’t just knowing the syntax - it’s applying multiple concepts together to solve novel problems!

Time Management: 5 min planning → 20 min coding → 5 min testing and debugging

Good luck escaping! 🚪

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