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Computer Science 50
Introduction to Computer Science I

Harvard College

Week 10

David J. Malan
malan@post.harvard.edu

0

Your Classmates by Gender
Female 29% 79
Male 71% 194

2

Oh, the Places You’ll Go!
CS 51: Introduction to Computer Science II
sneak preview on Friday, 7 December 2007
Abstraction and design in computation. Topics include: Functional and object-
oriented styles of programming; software engineering in the small; implementation of
a language interpreter. Goal: understanding how to design large programs to make
them readable, maintainable, efficient, and elegant. Exercises in LISP (Scheme)
and C++.

CS 61: Systems Programming and Machine Organization
sneak preview on Monday, 10 December 2007
Fundamentals of computer systems programming, machine organization, and
performance tuning. This course provides a solid background in systems
programming and a deep understanding of low-level machine organization and
design. Topics include C and assembly language programming, program
optimization, memory hierarchy and caching, virtual memory and dynamic memory
management, concurrency, threads, and synchronization.

6

TFs
Graders
Coders

Image from http://members.memlane.com/gromboug/P16MvSig.htm.
7

Recommended Reading
TCP/IP Tutorial
http://www.w3schools.com/tcpip/
How Web Servers Work
http://computer.howstuffworks.com/web-server.htm
XHTML Tutorial
http://www.w3schools.com/xhtml/
CSS Tutorial
http://www.w3schools.com/css/
PHP Tutorial
http://www.w3schools.com/php/
SQL Tutorial
http://www.w3schools.com/sql/

9

“RTFM”
PHP Manual
http://us.php.net/manual/en/
MySQL 5.0 Reference Manual
http://dev.mysql.com/doc/refman/5.0/en/

10

TCP/IP

Image from http://www.belkin.com/support/download/files/F5D7231-4.pdf. 12

HTTP

Image from http://computer.howstuffworks.com/web-server1.htm. 13

XHTML
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>hello, world</title>
</head>
<body>
hello, world
</body>
</html>

14

CSS
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<link href="styles.css" rel="stylesheet" type="text/css" />
<title>hello, world</title>
</head>
<body>
hello, world
</body>
</html>

15

Validation

http://validator.w3.org/

16

Forms
Text Fields
<input name="email" type="text" />
Password Fields
<input name="password" type="password" />
Checkboxes
<input name="save" type="checkbox" />
Radio Buttons
<input name="gender" type="radio" value="F" />
<input name="gender" type="radio" value="M" />
Drop-Down Menus
<select name="dorm">
<option value=""></option>
<option value="Matthews"></option>
<option value="Weld"></option>
</select>

17

Mispellings

$dictionary[$word] = TRUE;

18

Some Predefined Variables
$_GET
$_POST

19

Computer Science 50
Introduction to Computer Science I

Harvard College

Week 10

David J. Malan
malan@post.harvard.edu

21

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0047ecaa6ea3e9ac0a13a2fe96f4de3bfd515c88f5d90c1fae79b956363d7f02c7fa060269

1. Computer Science 50 Introduction to Computer Science I Harvard College Week 10 David J. Malan malan@post.harvard.edu 0

2. Your Classmates by Year 1

3. Your Classmates by Gender Female 29% 79 Male 71% 194 2

4. Your Classmates’ Comfort Levels 3

5. Your Classmates’ Prior Experience 4

6. Time Spent on Problem Sets 5

7. Oh, the Places You’ll Go! CS 51: Introduction to Computer Science II sneak preview on Friday, 7 December 2007 Abstraction and design in computation. Topics include: Functional and object- oriented styles of programming; software engineering in the small; implementation of a language interpreter. Goal: understanding how to design large programs to make them readable, maintainable, efficient, and elegant. Exercises in LISP (Scheme) and C++. CS 61: Systems Programming and Machine Organization sneak preview on Monday, 10 December 2007 Fundamentals of computer systems programming, machine organization, and performance tuning. This course provides a solid background in systems programming and a deep understanding of low-level machine organization and design. Topics include C and assembly language programming, program optimization, memory hierarchy and caching, virtual memory and dynamic memory management, concurrency, threads, and synchronization. 6

8. TFs Graders Coders Image from http://members.memlane.com/gromboug/P16MvSig.htm. 7

9. The year was 1995... 8

10. Recommended Reading TCP/IP Tutorial http://www.w3schools.com/tcpip/ How Web Servers Work http://computer.howstuffworks.com/web-server.htm XHTML Tutorial http://www.w3schools.com/xhtml/ CSS Tutorial http://www.w3schools.com/css/ PHP Tutorial http://www.w3schools.com/php/ SQL Tutorial http://www.w3schools.com/sql/ 9

11. “RTFM” PHP Manual http://us.php.net/manual/en/ MySQL 5.0 Reference Manual http://dev.mysql.com/doc/refman/5.0/en/ 10

12. Use the Bulletin Board! 11

13. TCP/IP Image from http://www.belkin.com/support/download/files/F5D7231-4.pdf. 12

14. HTTP Image from http://computer.howstuffworks.com/web-server1.htm. 13

15. XHTML <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>hello, world</title> </head> <body> hello, world </body> </html> 14

16. CSS <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <link href="styles.css" rel="stylesheet" type="text/css" /> <title>hello, world</title> </head> <body> hello, world </body> </html> 15

17. Validation http://validator.w3.org/ 16

18. Forms Text Fields <input name="email" type="text" /> Password Fields <input name="password" type="password" /> Checkboxes <input name="save" type="checkbox" /> Radio Buttons <input name="gender" type="radio" value="F" /> <input name="gender" type="radio" value="M" /> Drop-Down Menus <select name="dorm"> <option value=""></option> <option value="Matthews"></option> <option value="Weld"></option> </select> 17

19. Mispellings $dictionary[$word] = TRUE; 18

20. Some Predefined Variables $_GET $_POST 19

21. SQL SELECT INSERT UPDATE DELETE 20

22. Computer Science 50 Introduction to Computer Science I Harvard College Week 10 David J. Malan malan@post.harvard.edu 21

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