Microsoft Word - JL_BCS350_201_Module3_programming assignment (hw2).docx
BCS 350: Web Database Development
CRN 24518 JL Spring 2020
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Programming Assignment 2
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Objectives: To learn to write PHP code to process data passed from HTML form. To learn to write
PHP functions and process strings and characters.
Tasks:
Frequency analysis is the study of the frequency of letters in a text, i.e., the number of occu
ences of
each letter. In this assignment you will create dynamic web pages to perform frequency analysis to a text
document entered by the user.
You should create two files: hw2_freq_form.html and hw2_freq_process.php. The file
hw2_freq_form.html includes an HTML form with a textarea. It collects a text document entered
y the user. After the user submits the form, hw2_freq_process.php processes the data as follows:
1) Display the text document that is entered by the user.
2) Change lowercase letters to uppercase letters using the strtoupper function.
3) Define a function letterCount that accepts a string (text document) and a letter, finds and
eturns the number of times that the letter occurs in the string. You must write your own function
and not use any pre-defined PHP functions except strlen function.
Hint: This is the same procedure as searching for an item in an a
ay and finding its number of
occu
ences. A string is an a
ay of characters.
4) Call the letterCount function to find the number of times each uppercase alphabetic letter (‘A’
to ‘Z’) occurs in the text. If a letter doesn’t occur in the input text, then its count equals 0.
5) Find the total number of alphabetic letters in the input text. Special characters and punctuations
are not counted.
6) Calculate the letter frequency by dividing each letter count by the total number of letters. The
letter frequency is the percentage ratio of the number of times a letter occurs in the text to the total
number of alphabetic letters in the text.
7) Display the frequency analysis results in an HTML table in alphabetic order, i.e. display 26
alphabetic letters, the letter count and letter frequency for each letter. Keep 2 decimal places for
letter frequency.
Make a fieldset and place “BCS350 Assignment 2 - your name” on the top of both web pages. Don’t put
your name in the title of your page. You are free to decide the styles of your pages.
Be sure to add comments so readers can understand your code.
Extra Credit:
Sort the frequency analysis results in descending order of letter frequency and display the results in a
new table.
Hints:
1. For the extra credit part, use the a
ay_combine function to create an associative a
ay by using
the alphabet a
ay for keys and frequency a
ay for values. Then use one of the sort functions we learned
in class to sort the new a
ay as required.
2. If you need help on HTML textarea form and HTML tables, please refer to
http:
www.w3schools.com/tags/tag_textarea.asp
http:
www.w3schools.com/html/html_tables.asp.
Submission:
You should submit a ZIP file that includes two files named hw2_freq_form.html and
hw2_freq_process.php on Blackboard by the due date. Do NOT use any other file names.
Please include the integrity statement “I certify that this submission is my own original work” with
your name and RAM ID as comments in all your source files.
Sample Output:
1. hw2_form.html page launched
2. Results of hw2_freq_process.php (partial):
…