Assignment 3 – Tip Calculator Console App 

CSCI 470/502 Assignment 3 – Tip Calculator Console App 
100 points
In this assignment, you will develop a Java console app to calculate tips. We will break the code for this
assignment into two separate classes.
Class TipCalculator
This class encapsulates the tip calculation logic. It may be reused with a different user interface in a future
assignment.
Data Members
The class should have the following private data members:
• Bill amount (a double with the default value 0)
• Tip percentage (an integer with the default value 20)
• Party size (an integer with the default value 1)
Methods
The class should have the following methods:
• A default constructor (optional)
• Public getters and setters for the three data members.
• getTotalBill() – computes and returns the total bill (bill amount plus tip).
• getIndividualShare() – computes and returns the value of an equal share of the total bill (i.e., the
total bill divided by the party size).
Class TipApp
This class encapsulates the user interface of the app.
Data Members
• A TipCalculator object. (This could be a local variable in the calculateTips() method if you
prefer.)
Methods
• main() – creates an instance of TipApp (an object of itself!) and uses it to call calculateTips().
• calculateTips() – This method will contain the logic for interacting with the user at the keyboard
and displaying the output of the app. Feel free to extract parts of this logic into other methods that are
called by calculateTips().
1. Create a Scanner object to read input from the keyboard.
CSCI 470/502 Assignment 1 – Tip Calculator Console App Page 2 of 3
2. Prompt for and read the bill amount. If an invalid numeric value is entered by the user, print an error
message and repeat the process until a valid value is entered. When a valid value is entered, use it to
set the bill amount data member for the TipCalculator object.
3. Prompt for and read the tip percentage. If an invalid numeric value is entered by the user, print an
error message and repeat the process until a valid value is entered. When a valid value is entered,
use it to set the tip percentage data member for the TipCalculator object.
4. Prompt for and read the party size. If an invalid numeric value is entered by the user, print an error
message and repeat the process until a valid value is entered. When a valid value is entered, use it to
set the party size data member for the TipCalculator object.
5. Call the various TipCalculator methods to produce the output.
6. Ask the user whether they want to continue (enter another bill amount, tip percentage and party size)
and read their response. If the response is y or Y, go back to Step 2 and repeat.
Notes
• To make grading by the TA easier, remove all package statements in the .java files that you submit.
• Invalid input should include values that are not numeric (which will result in a
NumberFormatException when Java attempts to convert them to a number) as well as numeric values
that should not be possible.
For example, it would be impossible to have a negative bill amount or a party size of 0. However, a tip
percentage of 0 should certainly be possible.
• Both upper- and lower-case letters should be allowed in the user’s response to the
"Another bill? (y/n): " prompt.
Submit your two .java files on Blackboard. Do NOT zip your files for submission yet.
Sample Output
A sample run of the app might look something like this:
*** Tip Calculator ***
Enter the bill amount: 105.37
Enter your desired tip percentage (20 equals 20%): 2a
Please enter a valid tip percentage.
Enter your desired tip percentage (20 equals 20%): 20
Enter the size of your party: -3
Please enter a valid party size.
Enter the size of your party: 3 Sample output continues on the next page!
CSCI 470/502 Assignment 1 – Tip Calculator Console App Page 3 of 3
*** Your Bill ***
Bill Amount: $105.37
Tip Percentage: 20%
Party Size: 3
Total Bill (with Tip): $126.44
Share for Each Individual: $42.15
Another bill? (y/n): y
Enter the bill amount: 78.27
Enter your desired tip percentage (20 equals 20%): 23
Enter the size of your party: 2
*** Your Bill ***
Bill Amount: $78.27
Tip Percentage: 23%
Party Size: 2
Total Bill (with Tip): $96.27
Share for Each Individual: $48.14
Another bill? (y/n): N
Goodbye!