introduction to coding
TRANSCRIPT
Introduction to Coding
Agenda:• Understand how computers work and learn basic computer programming concepts (e.g., variables, syntax etc.)
• Gain an appreciation of the various programming languages and study what they can do.
• Develop a resource list of computer programming tutorials and tools.
• Become inspired to learn programming basics to help you work smarter and more efficiently.
Is coding a cryptic visual of typed languages?
Or a process? Or both?
Computer programming has a reputation of being cryptic and too complex for the average person; however, when you get familiar with basic programming logic you
will see patterns everywhere!
What is computer programming?• A set of commands a computer understands – like a recipe.
• Computer programs can help cure diseases; drive cars; create video games; make animated movies/graphics; build websites and apps; and much more. • Basic coding concepts are used by most every program and most every programmer.
• To learn more visit http://www.bfoit.org/itp/Programming.html
Why learn to code?• Why not? • Learn the importance of clarity/brevity of expression. • Be able to think and problem solve more accurately.• Have a better understanding of how technology works. • Create a tool that can make your life and many others’ lives easier.
“It has often been said that a person does not really understand something until he teaches it to someone else. Actually a person does not really understand something until after teaching it to a computer, i.e., express it as an algorithm.”
Donald Knuth, in American Mathematical Monthly
Describe in natural language how to make a peanut butter and jelly sandwich.
Some great resources to help you learn to code
.com
Learn to code interactively, for free.
Some Other Coding Resources• Lightbot is a programming puzzle game that gives the user a one-to-one relationship with programming concepts. Try it today at http://light-bot.com/!
• Hopscotch: Coding for Kids is an iPad programming language. Download it today at https://www.gethopscotch.com/ .• Code.org wants to bring Computer Science classes to every K-12 school. Check it out at http://code.org/ and find some excellent computer programming tutorials.
• Scratch helps children create stories, games, animations, and also lets them share these projects with others around the world. More info at http://scratch.mit.edu/.
• www.scratchjr.org is a free iPad app that brings coding to students as young as age five. • www.kodable.com gives children opportunities to program in order to solve puzzles. http://www.allcancode.com is similar.
• Visit Medium for a “2 minute read” listing other ideas and resources to help inspire children and teens to code.
• There are several MOOCs (Massive Open Online Course) and other freely available resources that offer computer programming classes. Coursera, Udacity, and Edx are great examples. Also, Khan Academy has some great resources for kids and adults too!
• A Google search query for computer programming resources for kids limited to the last year can be found at http://goo.gl/RaUups.
What is a programming language?• A programming language is set of rules that provides a way of telling a computer:• What operations to perform• Communicating an algorithm• Receives an input from the user and generates an output.
• A programming language is a system for describing a computation (math) or algorithms (logic) in a machine-readable and human-readable form.• Has words, symbols, and grammatical rules (natural language)
• Grammatical rules = Syntax• Each language has a different set of syntax rules
• Has semantics (meaning)
Slide courtesy of Brian Pichman
Tons of example code in the Arduino IDE (Integrated Development
Environment)
Raspberry Pi (Python) programming
Blinking LED code at: http://goo.gl/O3yozd
.org/downloadshttps://www.
Python Shell is where you enter commands and/or lines of code.
At the prompt type: print(“Hello, world!”)
IDLE - Integrated DeveLopment Environment)
# is a comment and the computer ignores it.The second line asks the user to enter their name and remembers it as "name.” This is a variable!The third line is a print statement, which prints the stored name.
demos
2.
1.
A Few Basic Programming Components (pretty much regardless of language)
• Variables & Arrays• Operators• Flow Control• Functions
Slide courtesy of Brian Pichman
Variables & Arrays
• A variable is a bucket that holds one piece of information. A variable can change value when• Specific conditions are met• Based on user input
• Examples (concept)• $string_myhomelibrary = “Montgomery Library”;• $numeric_variable= 100;• $myname = “Brian”;
Slide courtesy of Brian Pichman
Variables & Arrays
• An array is a type of variable (or bucket) that holds many pieces of information.
• Example (language doesn’t matter here; the concept does):• $FavoriteCities = array(“Orlando”, “Boulder”, “Miami”)• $FavoriteCities[0] holds “Orlando”
• $FavoriteCities [1] holds “Boulder”
• $States = array(“1” => “Prime”; “FL”=> “Florida”, “CO” => “Colorado”)• $States[“FL”] holds “Florida”
Slide courtesy of Brian Pichman
Operators
• Arithmetic +, -, *, / (add, subtract, multiply, divide)
• Assignment = (assign the value of 2 to the variable called v)$v = 2;
+= (“Add the value of 3 to the variable that already holds 1”)$v += 3; // $a now holds 5
Slide courtesy of Brian Pichman
Flow Control - Sequence• Reads like a book, the instructions are executed in the same order they where given:• OPEN the door• WALK inside the room• SIT on a chair• PICKUP a book• READ the book.
Slide courtesy of Brian Pichman
Flow Control - Choice• If Then
if (something is true/conditions are met) {then do this
}• If Then Else• Else: XYZ• Starts the same as “If Then” but allows a result if condition is false
• Else If if (something is true/conditions are met) {
then do this } elseif (another something is true/conditions are met) {then do this instead
}
Slide courtesy of Brian Pichman
Flow Control - Continual• With continual, instructions are executed based on variables, commands, outputs, etc … as they remain true
• While (or repeat)while (something is true) {do something here
}
• forfor (something is true) {do something here
}
Slide courtesy of Brian Pichman
Flow Control – Putting It Together• 1) Sequence
• Go to the library• Check out a book• Read the book• Return the book
• 2) Choice• If you have a library card, you can check out books. Otherwise open a library card account.
• 3) Repeat• Continue to read the book till there are no more pages.
Slide courtesy of Brian Pichman
Functions• A function is type of procedure or routine and usually returns a value.• A procedure preforms an operation, but typically doesn’t provide a value.
• Most languages have pre-built or pre-defined functions in its library. • For instance, the “delete” function means to “remove”. You don’t have to code what “remove” does; only what to remove.
Defining a function in Python
Download it for free and get great handouts at http://raptor.martincarlisle.com
RAPTOR is a flowchart-based programming environment.
DEMO
FORTRAN• FORmula TRANslation.• Developed at IBM in the mid-1950s.
• First programming language• Designed for scientific and mathematical applications by
scientists and engineers.
Traditional Programming Languages
Slide courtesy of Brian Pichman
COBOL• COmmon Business Oriented Language.• Developed in 1959.• Typically used for business applications.
BASIC• Beginner’s All-purpose Symbolic Instruction Code.• Developed at Dartmouth College in mid 1960s.• Developed as a simple language for students to write
programs with which they could interact through terminals.
Traditional Programming Languages (cont’d.)
Slide courtesy of Brian Pichman
C• Developed by Bell Laboratories in the early 1970s.• Provides control and efficiency of assembly language • Often used for system programs.• UNIX is written in C.
C++• It is C language with additional features.• Widely used for developing system and application software.• Graphical user interfaces can be developed easily with visual
programming tools.• Windows Based
Object-Oriented Programming Languages
Slide courtesy of Brian Pichman
JAVA• An object-oriented language similar to C++ that eliminates lots
of C++’s problematic features • Allows a web page developer to create programs for applications,
called applets that can be used through a browser.• Objective of JAVA developers is that it be machine, platform and
operating system independent.
• Scripting Languages• JavaScript and VBScript• Php and ASP• Perl and Python
• Command Languages• sh, csh, bash, cmd
Special Programming Languages
Slide courtesy of Brian Pichman
• HTML• HyperText Markup Language.• Used on the Internet and the World Wide Web (WWW).• Web page developer puts brief codes called tags in the page
to indicate how the page should be formatted.• XML• Extensible Markup Language.• A language for defining other languages.
Special Programming Languages
Slide courtesy of Brian Pichman
What do you want to make?
Source: https://www.udemy.com/
Source: https://www.udemy.com/
Source: https://www.udemy.com/
Source: https://www.udemy.com/
Other ways to learn coding
http://getfirebug.com/
See how things on the Web work behind the scenes using …
SCRATCH Basics
.mit.edu
Scratch is a programming language for everyone. Create interactive stories, games, music and art and share them online.
Finch Robot, ca. $100
http://www.finchrobot.com/
Ozobot, ca. $60
http://www.ozobot.com/
Lego WeDo / Lego Mindstorms
Sphero – ca. $130
http://www.sphero.com/
Dash and Dot, ca. $149
https://www.makewonder.com/
Interact with the real world using the Tickle App
https://tickleapp.com
Learn to program Arduino, drones, robots, connected toys, and smart home devices, all wirelessly.
Hopscotch App
https://www.gethopscotch.com/
pinocc.io, ca. $197
http://www.slideshare.net/chadmairn
@cmairn
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