KTurtle/C2/Grammar-of-TurtleScript/English-timed
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Revision as of 14:09, 9 July 2014 by Pratik kamble (Talk | contribs)
Time | Narration |
00:01 | Hello everybody. |
00:02 | 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 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 |
01:31 | Commands |
01:32 | Numbers |
01:33 | 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 content. |
02:14 | Variables can contain numbers $a=100. |
02:20 | strings $a=hello or |
02:25 | boolean values that is true or false $a=true |
02:32 | Variable keeps the content until program finishes execution or until it is reassigned to something else. |
02:41 | For example, consider the code. |
02:44 | Let us type,$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,
|
03:53 | I will clear the current code from 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 variable $subtract, |
04:31 | value 15 * 2 is be assigned to the variable $multiply. |
04:36 | 30/30 is assigned to the variable $divide. |
04:40 | go 10,10 commands to Turtle to go 10 pixels left of canvas and 10 pixels from top of canvas |
04:52 | print command displays the varible on the canvas |
04:56 | I will copy the code from text editor and paste it into KTurtle editor. |
05:03 | Pause the tutorial and type the program into 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 editor and type clear command and RUN to clean the canvas |
05:49 | I will zoom the progrm text to have 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 lets 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 | Boolean value false is assigned to variable $answer because 7 is greater than 5 |
07:43 | Let's Run the code now |
07:47 | Turtle diplays 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 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 comparision 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 summarises 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. |