Exam Questions: Higher Cert. in Computing (ACCS) - Internet Studies & Web Design, Exams of Computer Science

Download Exam Questions: Higher Cert. in Computing (ACCS) - Internet Studies & Web Design and more Exams Computer Science in PDF only on Docsity! Cork Institute of Technology Higher Certificate in Science in Computing (ACCS) - Award January 2007 Internet Studies & Web Design (Time: 3 Hours) Instructions Answer FOUR questions All questions carry equal marks. Examiners: Mr. C.E. Manning Ms. M. Meagher Ms. A. Brown Q1. (Total 25 marks) Part A (8 marks) Using Luhn formula for credit card validation determine if 4599228208463758 is a valid credit card number. [You must show your work. No marks for a simple yes or no] Part B (17 marks) Write a JavaScript script that inputs an ISBN and validates it using the checksum. If the number is valid the script should set a variable valid to true, and false if it is not valid. Q2. (Total 25 marks) Part A (20 marks) A website has saved a cookies on the user’s computer. Write a JavaScript program that reads the cookies to determine the user’s surname and sex and greets them appropriately with Mr. or Ms. e.g. Welcome Mr. Murphy e.g. Welcome Ms. Perez The surname is stored in a cookie called sname. The cookie called sex holds either “male” or “female”. You may assume that you know for certain that the cookie is present for this user. Part B (5 marks) For security and privacy reasons cookies are not generally available to just any server that requests to see them. Apart from the page that wrote the cookie initially, what other pages (if any) may view a cookie? 2 Q3. (Total 25 marks) A C A C A C A C C C C C C C C C C B C B C B C B C C C C C C C C A C A C A C A C C C C C C C C C C B C B C B C B C C C C C C C C The table above shows three differently coloured pixels that have been used to simulate R:200 G:20 B:60 by dithering. A is R:190 G:100 B:050 B is R:100 G:040 B:100 Part A (17 marks) What RGB values does C have? Part B (8 marks) Propose an alternative 2-colour dithering scheme for R:190 G:20 B:60