KTurtle/C3/Control-Execution/English

Slide Number 11 Summary

Visual Cue	Narration
Slide Number 1	Hello Everybody. Welcome to this tutorial on Control Execution in KTurtle
Slide Number 2 Learning Objectives	In this tutorial, we will learn 'while' loop and 'for' loop
Slide Number 3 System Requirement	To record this tutorial I am using, Ubuntu Linux OS Version 12.04 KTurtle version 0.8.1 beta.
Slide Number 4 Pre-requisites	We assume that you have basic working knowledge of Kturtle. If not, for relevant tutorials, please visit our website. http://spoken-tutorial.org
Switch to KTurtle Application Dash home >>Search bar appears>> In the Search bar type KTurtle	Let's open a new KTurtle Application. Click on Dash home. The Search bar appears. In the Search bar, type KTurtle. Click on the option. KTurtle Application opens.
	Let me first explain about what is control execution.
Slide Number 5 Control execution	Control execution is controlling the flow of a program. Different conditions are used to control program execution.
Slide Number 6 Loop	Loop is a block of code is executed repeatedly untill a certain condition is satisfied. Eg. “while” loop and “for” loop
	Let's begin the tutorial with “while” loop
Slide Number 7 “while” loop	In the “while” loop, the code inside the loop repeats till boolean evaluates to 'false'.
Slide Number 8 Syntax of “while” loop	Let me explain the structure of “while” loop. while loop condition { do something with loop increment variable }
	I already have the code in a text editor.
#program to print a series of multiples 3 upto 30 reset $x=0 message"In while loop, code inside the loop repeats till boolean evaluates false" while $x<30 { $x=$x+3 fontsize 15 forward 20 print $x }	Let me copy the program from text editor and paste it into KTurtle editor Please pause the tutorial here and type the program into your KTurtle editor. Please resume the turtorial after typing the program
	Let me zoom into the program text it may possibly be a little blurred.
	Let me explain the code.
Highlight #	# sign comments a line written after it. It means, this line will not be executed while running the program.
Highlight reset	reset command sets “Turtle” to its default position.
Highlight $x	$x=0 initialises the value of variable x to zero.
Highlight message" "	Message in a program is given within double quotes after the keyword message " " “message” command takes “string” as input. It shows a pop-up dialog box containing text from the string.
Highlight while $x<30	while $x<30 checks the “while” condition.
Highlight $x=$x+3	$x=$x+3 increments the value of variable $x by 3
Highlight fontsize 15	fontsize 15 sets the font size used by print command. Fontsize takes number as input, set in pixels.
Highlight forward 20	forward 20 commands “Turtle” to move 20 steps forward on the canvas.
Highlight print $x	print $x displays the value of variable x on the canvas.
Run the program	Let me click on the “Run” button to run the program. A message dialog box pops up. Let me click OK.
Run the program	Multiples of 3 from 3 to 30 are displayed on the canvas. “Turtle” moves 20 steps forward on the canvas.
	Let's next work with “for” loop
Slide Number 9 "for" loop	“for” loop is a counting loop. Every time the code inside “for” loop is executed, variable value is incremented, till it reaches the end value.
Slide Number 10 Syntax of “for” loop	Let me explain the structure of “for” loop. for variable = start number to end number { Statement}
Clear the editor and canvas	Let me clear the current program. Let me type clear command and run to clean the canvas.
#program print to sum of first 15 natural numbers reset' $r=0 for $x= 1 to 15{ $r=$x*($x+1)/2 fontsize 18 print $r forward 15 } 'go 10,250 wait 2 print "Sum of first 15 natural numbers ="+$r	Let me copy the program and paste it into KTurtle editor Please pause the tutorial here and type the program into your KTurtle editor. Please resume the turtorial after typing the program.
	Let me zoom into the program text it may possibly be a little blurred.
	Let me explain the code.
Highlight #	# sign comments a line written after it.
Highlight reset	reset command sets “Turtle” to default position.
Highlight $r=0	$r=0 initialises the value of variable r to zero.
Highlight for $x= 1 to 15	for $x= 1 to 15 checks “for” condition from 1 to 15.
Highlight $r=$x*($x+1)/2	$r=$x*($x+1)/2 calculates the value of variable r.
Highlight fontsize 18	fontsize 18 sets the font size used by print command.
Highlight print $r	print $r displays the variable r.
Highlight forward 15	forward 15 moves Turtle 15 steps foward.
Highlight go 10,250	go 10,250 commands Turtle to go 10 pixels from left of canvas and 250 pixels from top of canvas.
Highlight wait 2	“Turtle” displays all print commands without any time gap. “Wait 2” command makes Turtle to “wait” for 2 seconds before executing next command.
print "Sum of first 15 natural numbers ="+$r	“print” command displays the “string” within double quotes and also displays variable $r.
Run the program	Let me click the “ Run” button to run the program. A series of sum of first 15 numbers and sum of first 15 natural numbers is displayed on the canvas. Turtle moves 15 steps forward.
	With this we come to end of this tutorial.
Let us summarize. In this tutorial we have learnt to use, “while” loop and “for” loop
Slide Number 12 Assignment	As an assignment I would like you to write programs to evaluate Multiples of 2 using “while” loop Multiplication table of a number using “for” loop
Slide number 11	Acknowledgement Watch the video available at this URL http://spoken-tutorial.org/What is a Spoken Tutorial It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it
Slide Number 13	The Spoken Tutorial Project Team : Conducts workshops using spoken tutorials Gives certificates to those who pass an online test For more details, please write to contact@spoken-tutorial.org
Slide number 13	Spoken Tutorial Project is a part of the Talk to a Teacher project It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at this link http://spoken-tutorial.org/NMEICT-Intro ] This is Madhuri Ganpathi from IIT Bombay signing off Thank you for joining

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Madhurig