KTurtle/C2/Grammar-of-TurtleScript/English-timed

Time	Narration
00:01	Hello everybody.Welcome to this tutorial on Grammar of TurtleScript in KTurtle.
00:08	In this tutorial, we will learn about
00:11	grammar of Turtle script and 'if'-'else' condition.
00:16	To record this tutorial, I am using: Ubuntu Linux OS version 12.04 KTurtle version 0.8.1 beta.
00:29	We assume that you have basic working knowledge of KTurtle.
00:35	If not, for relevant tutorials, please visit our website: http://spoken-tutorial.org
00:40	Let's open a new KTurtle Application.
00:43	Click on Dash home.
00:45	In the Search bar, type: "kturtle".
00:49	Click on the KTurtle icon.
00:52	We can also open KTurtle using Terminal.
00:56	Press Ctrl+Alt+T keys simultaneously to open the Terminal.
01:01	Type kturtle and press Enter to open the 'KTurtle' Application.
01:08	Let's first look at TurtleScript.
01:11	TurtleScript is a programming language.
01:15	It has different types of words and symbols used for various purposes.
01:21	It instructs Turtle what to do.
01:25	Grammar of TurtleScript in KTurtle includes-
01:30	Comments, Commands
01:32	Numbers, Strings
01:34	Variables and
01:36	Boolean values.
01:38	Now, we will see where to store numbers.
01:42	Numbers can be stored in:
01:44	Mathematical operators
01:46	Comparison operators and
01:49	Variables
01:50	I will zoom the program text for clear view.
01:54	First let's look at variables.
01:57	Variables are words that start with ‘$’ sign, for example $a.
02:04	Variables are highlighted in purple color.
02:09	Using the assignment equal to (=), a variable is given its contents.
02:14	Variables can contain- * numbers $a=100.
02:20	strings $a=hello or
02:25	boolean values that is true or false $a=true.
02:32	Variable keeps the contents until program finishes execution or until it is reassigned to something else.
02:41	For example, consider the code.
02:44	Let us type:$a = 2004
02:50	$b = 25
02:55	print $a + $b
03:01	Variable 'a' is assigned a value 2004.
03:06	Variable 'b' is assigned a value 25.
03:10	print command, commands Turtle to write something on the canvas.
03:15	print command takes numbers and strings as input.
03:19	print $a + $b commands Turtle to add two values and display them on the canvas.
03:29	Let's Run the code in slow speed.
03:34	Value 2029 is displayed on the canvas.
03.40	Let us next see the mathematical operators.
03:44	Mathematical operators include - '+' (Addition) '-' (Subtraction) '*' (Multiplication) and '/' (Division)
03:53	I will clear the current code from the editor and type "clear" command and Run to clean the canvas.
04:01	I already have a program in a text-editor.
04:05	I will explain the code now.
04:08	“reset” command sets Turtle to its default position.
04:12	canvassize 200,200 fixes the width and height of the canvas to 200 pixels each.
04:22	Value 1+1 is assigned to the variable $add.
04:26	Value 20-5 is assigned to the variable $subtract.
04:31	Value 15 * 2 is assigned to the variable $multiply.
04:36	30/30 is assigned to the variable $divide.
04:40	go 10,10 commands Turtle to go 10 pixels left of canvas and 10 pixels from top of canvas.
04:52	print command displays the variable on the canvas.
04:56	I will copy the code from text-editor and paste it into KTurtle editor.
05:03	Pause the tutorial here and type the program into your KTurtle editor.
05:08	Resume the tutorial after typing the program.
05:13	Let us click on Run button to run the program.
05:17	Command which is getting executed is highlighted on the editor.
05:22	Turtle displays the values on the canvas at the specified positions.
05:34	Let us consider a simple example for using comparison operator .
05:41	I will clear the current code from the editor. Type "clear" command and Run to clean the canvas.
05:49	I will zoom the program text to have a clear view.
05:53	Let's type:
05:55	$answer = 10 > 3
06:03	print $answer
06:09	Here, 10 is compared to 3 with the greater than operator.
06:14	The result of this comparison, the boolean value 'true', is stored in the
06:19	variable $answer and the value 'true' is displayed on the canvas.
06:27	Let's run the code now.
06:29	Turtle displays Boolean value 'true' on the canvas.
06:34	Now, let's see how Strings work in this application-
06:39	Strings can be put in variables like numbers.
06:43	Strings cannot be used in mathematical or comparison operators.
06:49	Strings are highlighted in red color.
06:53	'KTurtle' identifies a line in double quotes as a string.
07:00	I will clear the current code from editor. Type "clear" command and Run to clean the canvas.
07:08	Now, I will explain about Boolean values.
07:11	There are only two boolean values: "true" and "false".
07:16	For example, let's type the code:
07:20	$answer = 7<5
07:28	print $answer.
07:34	The Boolean value 'false' is assigned to the variable $answer because 7 is greater than 5.
07:43	Let's Run the code now.
07:47	Turtle displays Boolean value "false" on the canvas.
07:51	Let's next learn about “if-else” conditon.
07:56	‘if’ condition is executed only if the boolean value evaluates ‘true’.
08:03	‘else’ condition is executed only if the ‘if’ condition is ‘false’.
08:09	I will clear the current code from editor. Type "clear" command and Run to clean the canvas.
08:17	I already have a code in a text file.
08:21	This code compares numbers 4 , 5 and 6 and displays the results accordingly on the canvas.
08:30	I will copy the code from text-editor and paste it into KTurtle editor.
08:36	Pause the tutorial here and type the program into your KTurtle editor.
08:42	Resume the tutorial after typing the program.
08:46	Let's run the code now.
08:49	The Turtle has compared the values 4 and 5
08:53	and has displayed the result: "4 is smaller than 6" on the canvas.
09:00	With this we come to the end of this tutorial.
09:05	Let's summarize.
09:07	In this tutorial, we have learnt about:
09:11	Grammar of Turtle script and
09:14	‘if-else’ condition.
09:17	Now, to the assignment part.
09:19	Solve an equation using:
09:22	if - else condition,
09:24	Mathematical and comparison operators.
09:27	Display the results using “print” and “go” commands.
09:33	To solve the assignment-
09:35	choose any four random numbers,
09:38	multiply two sets of random numbers,
09:42	compare the results using the comparison operators,
09:46	display both the results,
09:49	display greater result at the center of the canvas.
09:54	You can choose any equation which you like.
09:59	Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken-Tutorial
10:03	It summarizes the Spoken Tutorial project.
10:06	If you do not have good bandwidth, you can download and watch it.
10:12	The Spoken Tutorial project team :
10:14	Conducts workshops using spoken tutorials.
10:18	Gives certificates to those who pass an online test.
10:22	For more details, please write to: contact@spoken-tutorial.org
10:30	Spoken Tutorial project is a part of the Talk to a Teacher project.
10:35	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
10:43	More information on this mission is available at this link: http://spoken-tutorial.org/NMEICT-Intro
10:48	The Script is contributed by ITfC, Bangaluru.
10:52	This is Madhuri Ganpathi from IIT Bombay, signing off. Thank you for joining.

Contributors and Content Editors

Devraj, PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha