Wrapping it Wrapping it UpUp

Administrative: Final Projects…A Bit of CS and Programming

What We Didn’t Cover…Evals

Next Tuesday: Six Student Presentations

Next Thursday: Six Student Presentation

Computers are …Computers are …• Computers are not the object of study for CS• “Computers are to computer science as telescopes

are to astronomy,” Edsger Dijkstra, famous CS fellow• CS in interested in what can be computed?• algorithm: a recipe or step-by-step process for

achieving a desired result = design• Test your design = analysis• For complex problems, try experimentation. Try to

make something work…Agile v. Waterfall development

• Design, analysis, experimentation = the core of CS

functional view of a functional view of a computercomputer

Inputs DevicesCPU

Main Memory(RAM)

Output Devices

Secondary Memory

Q: What makes a computer magical ?A: It follows instructions. It can fetch, decode, execute…millions of instructions a second. Groups of instructions are programs.

languagelanguage• Each kind of computer (CPU) has its own machine

language. Machine languages are created by the CPU manufacturer.

• Source code must be compiled or transformed into machine language.

• For example: from Python (source) code to machine language for my clunky Pentium 4 computer at home.

programming programming languageslanguages

• program: a sequence of instructions• Designing a computer to understand human

language is still an unsolved problem, and anyway natural language is ambiguous

• For example: “I saw the man in the park with the my telescope.” What does this sentence mean?

• Programming languages are exact and unambiguous

computer languagescomputer languages

Ex. how to move the Ex. how to move the dragondragon

• What HTML code could you use to move the red dragon across the screen?

• None, use javascript• RDP session: HTML markupCode (structure) v. CSS language(style) v.Javascript

Dragon Javascript Dragon Javascript CodeCode

// JavaScript Documentvar x = -500; //Starting Location – leftvar y = 5; //Starting Location – topvar dest_x = 610; //Ending Location – leftvar dest_y = 375; //Ending Location – topvar interval = 1; //Move 10px every initialization

function moveImage() { //Keep on moving the image till the target is achievedif(x<dest_x) x = x + interval;if(y<dest_y) y = y + interval;

//Move the image to the new location document.getElementById("ufo").style.top = y+'px'; document.getElementById("ufo").style.left = x+'px';

if ((x+interval < dest_x) && (y+interval < dest_y)) { // Keep on calling this function every 100 microseconds// till the target location is reachedwindow.setTimeout('moveImage()',100);

} }

conclusionsconclusions• Programming and code are ubiquitous, used in

everything from movie making to missile guidance

• But most of what you will likely need is web-based and available as add-on modules… a CMS

• You won’t have to build from scratch• When you want to build something for the web,

become fluent with what is out there and the functionality of various components to build your new systems

• Creation, collaboration and conference: Using IT applications and tools, especially desktop video conferencing, screencast, podcast

• Social networking tools for organizations• Security: Dec. 10 National Security Class• Building an android or iPhone app?

• Next year, Your thoughts:• Ideas for integration with other GSPP components?• A GSPP Developers Code Group to do HTML, SQL,

Python and other tech and code projects ?• An IT Speakers Series for the Spring?• …

what we didn’t do in what we didn’t do in classclass

next time:next time:• Dec. 4: Presentations

• Student• Student• Student• Student• Student• Student

• Dec. 6: Presentations• Student• Student• Student• Student• Student• Student