CSCI 1103 Lab02: Simple Input

Completing this lab will teach some basic input/output skills. In particular, basic methods to retrieve integers and doubles from the user via the TextIO class will be needed apprising students to the basics of getting dynamic behavior from their programs.

As in Lab01, download the code pack linked at the top of the page. Unzip this which will create a folder and create your files in that folder.

Create a file named Burgers.java which will print a welcome message and prompt the user to enter some simple information. The overall usage of the program will look like the following.

> javac Burgers.java
> java Burgers
Welcome to Good Burger,
Home of the Good Burger
May I take your order?
----------------------
Burgers: $2.55
Fries:   $0.99
Tax:      7.2%
----------------------
Number of burgers: 
4
Number of fries: 
6
Total: $16.14
Tax: $1.1620800000000002
Grand Total: $17.30208

A few notes to save you trouble.

• The lines with a 4 and 6 above are input, stuff the user should type.
• Print the prices with fixed strings as in

  System.out.println("Burgers: $2.55");
  

  While this is generally a bad practice, printing numbers with a specific number of decimal places takes a bit of effort and will be covered later.

• Make sure to use the TextIO.getInt() method to retrieve integers from the user to calculate their order.
• Don't worry about the messy output numbers at the end like

  Tax: $1.1620800000000002
  

  Printing with a specific number of decimal places will be covered soon but if you are curious about it now, ask your TA about the System.out.printf( ... ) method.

Create a file named Gratuity.java which will prompt the user for a bill, the amount of gratuity (tip) they would like to leave, and the number of people involved in the meal/outing. The program will then print the overall total bill and the amount each person should pay. Below are sample runs.

> java Gratuity
Total bill (ex: 34.56):
100
Tip percentage (ex: 15.5):
5
Number of people (ex: 4):
1
Total with tip: $105.0
Each person pays: $105.0

> java Gratuity
Total bill (ex: 34.56):
46.54
Tip percentage (ex: 15.5):
13.9
Number of people (ex: 4):
3
Total with tip: $53.00906
Each person pays: $17.669686666666667

Some notes

• You'll need to use the TextIO.getDouble() method here as some of the numbers are floating point values.
• For the number of people, either an integer or a floating point number should work. Choose what you feel is appropriate.
• The tip is entered as a number but should be converted to a fraction by dividing by 100.
  • 7.5% tip should become 0.075
  • 23.99% tip should become 0.2399