AN INTRO TO PROGRAMMING

What Happened to Teaching This in School?

W H O A M I ?

James L. Siegel Jr.AAS Information Technology, Network AdministrationLPIC-1, Novell CLA, Linux+, A+, Net+, Security+Linux Systems Administrator, MIE Inc.Presenter at BsidesCleveland (‘12)– Breaking Out of the Echo ChamberSpeaker at DerbyCon StableTalks (‘12) – Nice to Meet You Programming since late 1970s -----

Basic, COBOL, Pascal, C, C++, Batch scripting in DOS, BASH scripting in Linux, and now Python, Ruby, and some Perl.

TODAY IN A NUTSHELL

Examine what is a computer

What makes them work?

Imagination defines the limits of potential

What is a program?

You can do it too

Demonstration

Suggestions

WHAT IS A COMPUTER?

A device that computes, especially a programmable electronic machine that performs high-speed mathematical or logical operations or that assembles, stores, correlates, or otherwise processes information.

WHAT MAKES THEM WORK?

The nuts and bolts of it from the last slide?A bunch of electronics that respond

to programmable instructions.

I guess, that must mean…

PROGRAMMERS

WHAT IS A PROGRAM?

How about this?A program is a set of ordered instructions for a computer to perform?

Still too wordy? Unclear, ok… let’s talk about it.

WHAT SOME OF IT LOOKS LIKE

#include <stdio.h> int main(void) { printf("Hello world!"); return 0; }

#include <stdio.h> int main(void){ printf("Hello world!"); return 0;}

#include <iostream> int main(){ std::cout << "Hello World!";}

public class HelloWorld { public static void main() { System.out.println("Hello world!"); }}

C C++

JAVA

What if I told you, that it can be done even simpler than that???print "Hello World"

puts "Hello world!"

That’s Python

That was Ruby

More Examples here:

Hello world different ways

PHASES OF DEVELOPMENT

Define task/problem = Scope

Plan the Solution:Find suitable

algorithmFind data

structures

= Design

Write the Code = Implementation

Fix errors (bugs) = Testing and Debugging

Pseudocoding should be done here

DEMO TIME

Let’s Try Some Shall We??

http://www.learnpython.org/

A Beginner's Python Tutorial

Python for Beginners

Google’s Python Class Online

Learn On Your Own

Python.org Tutorial Even M.I.T. Helps You Learn

Ruby in 20 MinutesTry Ruby