1. CPS 1: Computer Science Fundamentals Vijay Abhijit 18th May, 2001

2. Administrivia Read webpage regularly –http://www.cs.duke.edu/education/courses/summer01/cps001 Read newsgroup –news:duke.cs.cps001 –don’t forget to read handout on reading news ! On webpage you will find: –Assignment information –Syllabus and timetable –Handout of slides

3. Administrivia (contd.) Textbooks ! –Please arrange for them so that we can start on pre-reading at home –Readings to be assigned from next week Good to have a floppy with you in case of network failure / congestion –Save work to acpub later from floppy

4. Assignment 0 Send me email! ( abhijit@cs.duke.edu OR vijay.abhijit@duke.edu ) [due Fri, May 18, 11:59pm]vijay.abhijit@duke.edu –Your name –Major –Class [Fresh / Soph / Jun / Sen / Grad] –Box at home? [PC / Mac] – Programmed before? [Never / Basic / Pascal / HTML / Java / C++ / C / Other] –What would you like to learn from this course?

5. Assignment 1 Make a webpage and make a newsgroup posting [due Tue, May 22, 11:59pm] –You will not have two assignments in parallel, except this just once –Detailed instructions on webpage! –Make sure you read instructions carefully before you start –Would you want me to assist you at the North Cluster on Saturday / Sunday? –Start early !

6. Final Exam, Mid Term & Quizzes Final Exam –June 28th [2:00 - 5:00pm] ? Mid Term –June 6th [during classhours] ? Quizzes start next Friday –45 min duration Full syllabus to be up on web by this weekend

7. Review from yesterday IMAGE FORMATS gif [GRAPHICAL INTERCHANGE FORMAT] –originally from Compuserve –file has gif or giff extension –supports 256 colors jpeg [JOINT PHOTOGRAPHIC EXPERTS GROUP] –file has jpg / jpeg / jfif extension –economizes on the way data is stored –identifies and discards "extra" data –“lossy” compression

8. Review from yesterday IMAGE FORMATS [contd.] bmp [BITMAP] –file has bmp / dib / vga / bga / rle / rl4 / rl8 extension –from Windows –uncompressed format, files are “huge” Where else is compression used –Programs like Winzip!

9. Files saved as.html vs.htm You can save files as either.html or.htm –Browser will still treat it as HTML file.htm was the only way out on DOS machines –only three letter extensions permitted in DOS But if you have words.html and you use, you will not get words.html

10. HTML wrapup So far you have dealt with – –, – –,, –, ALT> –, BACKGROUND>,,

11. Advanced HTML : index.html is “special” index.htm OR index.html is “default” page picked up by browser when you direct it to a site If you have say home.html in your public_html directory, it won’t work… Moral of the story: Always name your home page as index.html

12. Advanced HTML : COMMENTS & mailto: –Useful when you do not want to display something on webpage but do not want to delete that code –Useful when you wish to share “info” in your source code Vijay Abhijit –click on the link and you can send mail...

13. Advanced HTML Paragraphs and align –, – Tables –

14. Color Codes red FF0000 blue 0000FF orange FF7F00 purple 9370DB yellow FFFF00 black 000000 green 00FF00 white FFFFFF

15. Tricks to keep in mind :) How do you print a “<In times of need” on a webpage? –Most browsers treat <In times of need as badly formatted tag and ignore it –< AND > How do you print multiple spaces between words in a web page? –

16. Background Sound! –midi [MUSICAL INSTRUMENT DIGITAL INTERFACE] –causes elshad.midi to be played in an infinite loop, the moment the page is loaded –elshad.midi picked up from same directory as HTML file that above code is embedded in –use BGSOUND with caution –nothing turns people off more than annoying music that plays forever

17. Talking of Sound... Heard of MP3? –MPEG [MOVING PICTURES EXPERTS GROUP] format for storing movie files file has.mpeg or.mpg extension compression system –MP3 is MPEG subsystem for compressing sound –[MPEG audio Layer-3] Encoding

18. The Idea behind MP3 Certain sounds that human ear cannot hear Certain sounds that human ear hears much better than others If there are two sounds playing simultaneously we hear louder one better than softer one Throw away certain parts of song, compress rest! None complains except perhaps your dog!

19. Next week : Java! Real programming!