KTurtle/C3/Control-Execution/English-timed

Time	Narration
00:01	Hello everybody.
00:03	Welcome to this tutorial on Control Execution in KTurtle.
00:10	In this tutorial, we will learn:
00:13	* 'while' loop and
00:15	* 'for' loop.
00:17	To record this tutorial, I am using: Ubuntu Linux OS Version 12.04 KTurtle version 0.8.1 beta.
00:32	We assume that you have basic working knowledge of Kturtle.
00:38	If not, for relevant tutorials, please visit our website: http://spoken-tutorial.org
00:45	Let's open a new KTurtle Application.
00:48	Click on Dash home.
00:50	In the Search bar, type: "kturtle".
00:53	Click on the option. KTurtle Application opens.
00:59	Let me first explain about what is control execution.
01:05	Control execution is controlling the flow of a program.
01:10	Different conditions are used to control program execution.
01:16	Loop is a block of code, executed repeatedly till a certain condition is satisfied.
01:25	e.g. “while” loop and “for” loop.
01:30	Let's begin the tutorial with “while” loop.
01:34	In the “while” loop, the code inside the loop repeats till Boolean evaluates to "false".
01:42	Let me explain the structure of “while” loop: while 'loop condition' { do something with loop increment variable }
01:56	I already have the code in a text-editor.
01:59	Let me copy the program from text editor and paste it into KTurtle editor.
02:07	Please pause the tutorial here and type the program into your KTurtle editor.
02:13	Resume the tutorial after typing the program.
02:18	Let me zoom into the program text, it may possibly be a little blurred.
02:25	Let me explain the code.
02:27	'#' hyash sign comments a line written after it.
02:32	It means, this line will not be executed while running the program.
02:38	reset command sets “Turtle” to its default position.
02:43	$x=0 initializes the value of variable 'x' to zero.
02:52	Message in a program is given within double quotes after the keyword "message". “message” command takes string as input.
03:04	It shows a pop-up dialog-box containing text from the string.
03:11	while $x<30 checks the “while” condition,
03:17	$x=$x+3 increments the value of variable $x by 3.
03:27	fontsize 15 sets the font-size used by print command.
03:35	fontsize takes number as input, set in pixels.
03:42	forward 20 commands Turtle to move 20 steps forward on the canvas.
03:52	print $x displays the value of variable 'x' on the canvas.
04:01	Let me click on the Run button to run the program.
04:05	A message dialog-box pops up. Let me click OK.
04:11	Multiples of 3, from 3 to 30, are displayed on the canvas.
04:17	Turtle moves 20 steps forward on the canvas.
04:22	Let's next work with “for” loop.
04:26	“for” loop is a counting loop.
04:29	Every time the code inside for loop is executed,
04:34	variable value is incremented till it reaches the end value.
04:41	Let me explain the structure of “for” loop.
04:46	for variable = start number to end number { Statement}
04:55	Let me clear the current program.
04:59	Let me type "clear" command and run to clean the canvas.
05:05	Let me copy the program from text-editor and paste it into KTurtle editor.
05:14	Please pause the tutorial here and type the program into your KTurtle editor.
05:20	Resume the tutorial after typing the program.
05:25	Let me zoom into the program text, it may possibly be a little blurred.
05:32	Let me explain the program.
05:34	'#' hyash sign comments a line written after it.
05:39	reset command sets Turtle to its default position.
05:44	$r=0 initializes the value of variable 'r' to zero.
05:52	for $x= 1 to 15 checks “for” condition from 1 to 15.
06:01	$r=$x*($x+1)/2 calculates the value of variable 'r'.
06:12	fontsize 18 sets the font-size used by print command.
06:19	print $r displays the value of variable 'r' on the canvas.
06:26	forward 15 commands Turtle to moves 15 steps forward on the canvas.
06:34	go 10,250 commands Turtle to go 10 pixels from left of canvas and 250 pixels from top of canvas.
06:48	“Turtle” displays all print commands without any time gap.
06:54	“Wait 2” command makes Turtle to wait for 2 seconds, before executing next command.
07:04	“print” command displays the string within double quotes and also displays variable '$r'.
07:13	Let me click on the Run button to run the program.
07:17	A series of sum of first 15 natural numbers and "Sum of first 15 natural numbers" are displayed on the canvas.
07:27	Turtle moves 15 steps forward on the canvas.
07:32	With this, we come to the end of this tutorial.
07:37	Let us summarize.
07:40	In this tutorial, we have learned to use
07:44	“while” loop and “for” loop.
07:47	As an assignment, I would like you to write programs to evaluate-
07:54	* Multiples of 2 using “while” loop.
07:58	* Multiplication table of a number using “for” loop.
08:03	Watch the video available at this URL: http://spoken-tutorial.org/What_is_a_Spoken-Tutorial
08:08	It summarizes the Spoken Tutorial project.
08:12	If you do not have good bandwidth, you can download and watch it.
08:17	The Spoken Tutorial project team:
08:20	* Conducts workshops using spoken tutorials.
08:23	* Gives certificates to those who pass an online test.
08:27	For more details, please write to: contact@spoken-tutorial.org
08:36	Spoken Tutorial project is a part of the Talk to a Teacher project.
08:41	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
08:48	More information on this mission is available at this link: http://spoken-tutorial.org/NMEICT-Intro
08:54	This is Madhuri Ganpathi from IIT Bombay, signing off. Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha