CS170 – Computer Applications for Business
Fall 2023 • Assignment 8
Functions, Loops & Arrays
Due Date: Before 11:59 p.m. on Friday, November 10th
, 2023
Accept Until: Before 11:59 p.m. on Friday, November 17th, 2023
Evaluation: 25 points
Submit to Canvas: Assignment8.html file
Related Materials: JavaScript Reference Guide
Need help? TA office hours and Lab Support Schedule posted in Canvas
YOU ARE ON YOUR HONOR TO COMPLETE THIS ASSIGNMENT WITHOUT ASSISTANCE. You may
use your text and resources available to you through Canvas. You MAY NOT ask any human for
assistance, give assistance to anyone, or use any online tutoring service.
Use only the coding syntax taught to you during classes and recitations. The use of other
coding syntax may result in your work being marked for further review due to possible
unauthorized assistance.
Learning Objectives:
In general, this assignment is designed to practice JavaScript concepts from Chapters 17 top 20 of the
textbook. In particular, the following items will be useful for this assignment:
1. Creating functions
2. Calling functions
3. Creating and initializing arrays
4. Creating and using loops
5. Using Number() function to ensure values are treated as numbers and not strings
6. Using concatenation to add currency or percent symbols
7. Using toFixed(2) method to round to 2 decimal places
8. Reading and understanding the use of comments
To earn credit for this assignment:
1 You will create JavaScript code – embedded on an HTML file - according to the requirements listed
on the next pages.
2 Upload and submit a single html file (.html extension) containing the code required.
For your assignment to be graded, please include the following statement as a comment in the
section of the program:
“ On my honor, I have neither received nor given any unauthorized assistance on this assignment.”
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PROBLEM DESCRIPTION
The Pet House provides pet boarding services. Pet owners can contract their services for a given number of
days while they are away on vacation or a business trip. As an option, the Pet House provides veterinarian
checkup. Their prices are as follows:
Pet Price per Day ($)
Dog 25
Cat 15
Hamster 10
Veterinarian Checkup (optional): $120 (fixed rate) regardless of the number of days contracted.
Sales Tax Rate: the Sales Tax for the program will be 7%.
You are required to implement the interface shown below which will use JavaScript to calculate the price for
each transaction. In addition, the program shall generate a report showing some statistical information.
A video of a sample run of this completed assignment is available on the assignment’s webpage on Canvas.
Note: See the illustration above and the sample video for examples of the inputs and
outputs required.
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Inputs needed:
Pet Type: one of the following three: dog, cat, hamster.
Number of Days: the number of boarding days contracted.
Veterinarian Checkup: optional service.
Output required (produced by the Process button):
Price: Number of Days x Price per Day (according to the table on this page) + Veterinarian Fee (if contracted).
Final Price: Price + applicable Sales Tax.
Note: Watch the Sample Video posted on Canvas (on the assignment 8 page)
After all the inputs are processed, the “Process Statistics” button will be clicked on to generate a
report.
The Report will be displayed on a separate webpage
Note: See the Sample Report on the following page
The Report will contain the following parts:
A Heading section with the following on separate lines:
The Pet House (as heading)
Statistics Report (as subheading)
The Date/Time of the Invoice
Below the Heading, the transactions listed with the following on each line:
Transaction: a sequential number starting with 1
Pet
Days
Vet Checkup
Transaction Price $
Final Price $
Below the transactions:
Total Transactions (before tax)
Average Transaction (before tax)
Total Days: total number of days contracted for all pets
Average Number of Days: average number of days contracted for all pets
Additional Note:
The document.write function should be used heavily to generate the report.
Requirements:
Arrays:
Use four additional parallel array to hold the information that will be displayed on the report: pet type, days
contracted, veterinarian checkup choice, price per transaction.
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Functions
Functions are required to:
Initialize the four parallel arrays that will hold the transaction data: one array to hold pet types, another
one to hold days contracted, the next one to hold the veterinarian checkup choice and the last one to
hold the price of the transaction.
◦ Since some arrays will contain strings and some other arrays will contain numbers, two functions will be
required to initialize arrays: one to set element of array to empty strings and another to set elements of
an array to 0. In addition, a third function that adds up the elements of an array will be needed.
Use loops to process the elements of the arrays.
SAMPLE TEST DATA and RESULTS
Inputs Pet Type Number of
Days
Veterinarian
Checkup
Dog 3 Yes
Cat 2 No
Hamster 5 Yes
Sample Report (based on inputs above):
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Additional Information:
• Be sure to include a comment with your name and section in the part of your HTML code
program.
• To enter the date on the report use the syntax: var d = new Date(); which captures current Date/Time
on the d variable.
• Since the content of a text box which requires a number may be used in mathematical operations, use
the function Number() to ensure that the numeric input is treated as numeric data. Syntax example:
x = prompt(“Enter some number”);
x = Number(x);
Syntax example to round up a number to 2 decimals. Just add .toFixed(2) to the variable name
containing the number. Syntax example:
someNumber.toFixed(2)
To simplify the comparison of text data entered by the user, it is often easier to convert this
text to upper case using the notation below. Syntax example:
textVariable = textVariable.toUpperCase();
• Examples related to radio buttons (these are examples only, the name, id and onclick
content should be related to your code):
• Using radio buttons:
•
•
• In the example above, the two associated radio buttons, load the appropriate value to the variable
sizeData based on the user’s selection.
• Clearing radio buttons:
• The radio buttons in the previous example may be cleared by using the following syntax in a
program:
• large.checked = false;
• small.checked = false;
• Notice that the IDs of the radio buttons are used when clearing a radio button.
Point Values
Student name inserted as comment in the head section 1
Variable declarations and initializations 2
Inputs 3
Outputs 2
Arrays 4
Loops 3
Functions 3
IF statements 2
Program execution 5
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References:
Recitation sessions
Lectures
Fluency textbook Chapters 17 to 20
JavaScript Reference Guide
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