Difference between revisions of "KTurtle/C2/Grammar-of-TurtleScript/English"
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| + | Title of the tutorial: Grammar-of-TurtleScript | ||
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| + | Author: ITfC Bangaluru | ||
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| + | Key words: Grammar of Turtle script, if-else condition, Comments, Commands, Numbers, Strings, Variables, Boolean values, strings and video tutorial. | ||
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{|border =1 | {|border =1 | ||
!Visual Cue | !Visual Cue | ||
Latest revision as of 15:38, 18 December 2013
Title of the tutorial: Grammar-of-TurtleScript
Author: ITfC Bangaluru
Key words: Grammar of Turtle script, if-else condition, Comments, Commands, Numbers, Strings, Variables, Boolean values, strings and video tutorial.
| Visual Cue | Narration |
|---|---|
| Slide Number 1
Title slide |
Hello everybody.
Welcome to this tutorial on Grammar of TurtleScript in KTurtle. |
| Slide Number 2
Learning Objectives |
In this tutorial, we will learn about
|
| 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. |
| Switch to KTurtle Application
Dash home >>In the Search bar type KTurtle click on the KTurtle icon. |
Let's open a new KTurtle Application.
Click on Dash home. In the Search bar, type KTurtle. Click on the KTurtle icon. |
| Press CTRL+ALT+T >> open the Terminal
>>type kTurtle >>press enter to open |
We can also open KTurtle using Terminal.
Press CTRL+ALT+T simultaneously to open the Terminal. Type KTurtle and press enter to open the KTurtle Application. |
| Slide Number 5
Turtle Script |
Let's first look at TurtleScript
|
| Slide Number 6
Grammar of TurtleScript |
Grammar of TurtleScript in KTurtle includes-
|
| Slide Number 7
Numbers |
Now we will see where to store numbers
Numbers can be stored in
|
| Zoom text | I will zoom the program text for clear view. |
| Switch to KTurtle window | First let's look at variables.
Variables are words that start with ‘$’ sign, for example $a. In the editor they are highlighted in purple color. Using the assignment, equal to (=), a variable is given its content. Variables can contain numbers $a=100. strings $a=hello or boolean values that is true or false $a=true Variable keeps the content until program finishes execution or until it is reassigned to something else. |
| For example, consider the code.
$a = 2004 $b = 25 print $a + $b | |
| Variable 'a' is assigned a value 2004.
Variable 'b' is assigned a value 25 print command, commands Turtle to write something on the canvas. print command, takes numbers and strings as input. print $a + $b commands Turtle to add two values and display them on the canvas. | |
| Run the code | Let's Run the code in slow speed.
Value 2029 is displayed on the canvas |
| Slide Number 8
Mathematical operators |
Let us next see the Mathematical Operators.
Mathematical operators include,
|
| Clear code | I will clear the current code from editor and type clear command and RUN to clean the canvas |
| I already have a program in a text editor. | |
| I will Explain the code now | |
| Highlight reset | “reset” command sets Turtle to its default position |
| Highlight canvassize 200,200 | canvassize 200,200 fixes the width and height of the canvas to 200 pixels each. |
| Highlight $add = 1 + 1 | value 1+1 is assigned to the variable $add, |
| Highlight $subtract = 20 – 5 | Value 20-5 is assigned to variable $subtract, |
| Highlight $multiply = 15 * 2 | value 15 * 2 is be assigned to the variable $multiply. |
| Highlight $divide = 30 /30 | 30/30 is assigned to the variable $divide. |
| Highlight go 10,10 | go 10,10 commands to Turtle to go 10 pixels left of canvas and 10 pixels from top of canvas |
| Highlight print commands | print command displays the varible on the canvas |
|
reset canvassize 200,200 $add = 1 + 1 $subtract = 20 – 5 $multiply = 15 * 2 $divide = 30 /30 go 10,10 print $add go 50,50 print $subtract go 100,100 print $multiply go 175,175 print $divide go 0,0 |
I will copy the code from text editor and paste it into KTurtle editor.
Pause the tutorial and type the program into KTurtle editor. Resume the tutorial after typing the program |
| Run code
Point to the values |
Let us click on Run button to run the program
Command which is getting executed is highlighted on the editor. Turtle displays the values on the canvas at the specified positions. |
| Let us consider a simple example for using comparison operator .
Type the commands being shown on the screen. | |
| Clear code | I will clear the current code from editor and type clear command and RUN to clean the canvas |
| zoom text | I will zoom the progrm text to have clear view |
| Switch to Kturtle Window | Let's type
$answer = 10 > 3 print $answer Here 10 is compared to 3 with the ’greater than’ operator. The result of this comparison, the boolean value true is stored in the variable $answer and the value true is displayed on the canvas. |
| Run the code | Let's run the code now
Turtle displays Boolean value true on the canvas. |
| Slide Number 9
Strings |
Now lets see how Strings work in this application –
|
| clear code | I will clear the current code from editor.type clear command and Run to clean the canvas |
| Boolean Values | Now I will explain about Boolean values.
There are only two boolean values: true and false. |
| For example Let's type the code
$answer = 7<5 print $answer Boolean value false is assigned to variable $answer because 7 is greater than 5 | |
| Run code | Let's Run the code now
Turtle diplays Boolean value false on the canvas. |
| “if-else” conditon. | Let's next learn about “if-else” conditon.
‘if’ condition is executed only if the boolean value evaluates ‘true’ ‘else’ condition is executed only if the ‘if’ condition is ‘false’ . |
| clear code | I will clear the current code from editor.type clear command and Run to clean the canvas |
| I already have a code in a text file. | |
| Highlight the code | This code compares numbers 4 , 5 and 6 and displays the results accordingly on the canvas. |
| reset
$x=4 if $x>5 { print $x print “is greater than five” } else { print $x print “is smaller than six” } go 0,0 |
I will copy the code from text editor and paste it into KTurtle editor.
Pause the tutorial and type the program into KTurtle editor. Resume the tutorial after typing the program |
| Run code | Let's Run the code now
the Turtle has compared the values 4 and 5. and has displayed the result 4 is smaller than 6 on the canvas . |
| With this we come to the end of this tutorial.
Let's summarize. | |
| Slide Number 10
Summary |
In this tutorial, we have learnt about
|
| Slide Number 11
Assignment |
Now to the assignment part.
Solve an equation using
|
| Slide Number 12
Assignment |
To solve the assignment
|
| Slide number 13
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 14 | 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 15 | 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 ] The Script is contributed by ITfC Bangaluru. This is Madhuri Ganpathi from IIT Bombay signing off Thank you for joining. |
