KTurtle/C2/Grammar-of-TurtleScript-Part-I/English-timed
> > > {| style="border-spacing:0;" > > | Time > > |Narration > > > |- > > | 00.02 > > |Hello Everybody. Welcome to the KTurtle tutorial > > > > > |- > > | 00.05 > > |If this is the first time you are using KTurtle, please see the > “Introduction to KTurtle” tutorial on the spoken tutorial website. > > > |- > > |00.12 > > | To get started with KTurtle, I am using the Linux operating system ubuntu > Version 11.04 and KTurtle version 0.8.1 beta. > > > |- > > | 00.21 > > |This tutorial will help you understand further, the Grammar of > TurtleScript. > > > |- > > | 00.26 > > | If you have already installed KTurtle, > > > |- > > | 00.28 > > |go to the Ubuntu Menu Item Applications > Education and click > on the KTurtle Application. > > > |- > > | 00.34 > > |Another way to open KTurtle is by going to Applications > Accessories > menu and click on Terminal > > > |- > > | 00.39 > > | At the prompt type the name of the application that is “kturtle” and > hit 'Enter'. > > > |- > > | 00.46 > > |This will open the application. > > > |- > > |00.51 > > | In this tutorial, we will learn, the grammar of turtle script which > includes, > > > > > |- > > | 00.55 > > | commands and comments > > > |- > > | 00.56 > > | numbers, variables and strings > > > |- > > | 00.58 > > |mathematical and comparison operators > > > > |- > > | 01.00 > > |and the boolean values > > > |- > > |01.02 > > |And the if and else conditions > > > |- > > | 01.05 > > | The TurtleScript is a programming language and has different types > of words and symbols. > > > |- > > | 01.10 > > |They are used for different purposes. > > > |- > > | 01.12 > > |And it instructs KTurtle to do something. > > > |- > > | 01.15 > > |The grammar of TurtleScript can include comments and commands, numbers > and strings . > > > |- > > | 01.24 > > |Numbers can be stored in mathematical operators in comparison > operators. > > > |- > > | 01.28 > > |They can also be stored in variables. > > > |- > > | 01.33 > > |let us First have a look at variables, then we look at assigning values to > these variables. > > |- > > |01.38 > > |In the editor of a Kturtle script ,let us open example for > avariable. > > > |- > > |01.43 > > |Variables are words that start with a symbol ‘$’, for example $a. > > > |- > > | 01.48 > > |In the editor they are highlighted with the purple color. > > > |- > > | 01.52 > > |Using the assignment, equal to a variable is given its content. > > > |- > > | 01.56 > > |Variables can contain any number, string or boolean values (true/false). > > > |- > > | 02.05 > > |It will keep that content until the program finishes the execution or until > the variable is reassigned to something else. > > > |- > > | 02.11 > > |You can use variables, once assigned, just as if they are their content. > > > |- > > | 02.16 > > |For example, consider the code being typed in the editor now. > > > > |- > > | 02.20 > > |'$a = 2004 '$b = 25 > > > |- > > | 02.27 > > |Andprint $a + $b > > > |- > > | 02.33 > > |First the value 2004 is assigned to the variable $a . > > > |- > > | 02.37 > > |The next the value 2005,25'is assigned to variable '$b . > > > > > |- > > | 02.42 > > |The print command is used to command the turtle to print something on > the canvas. > > > > > |- > > | 02.47 > > |print takes numbers and strings as input. > > > > > |- > > | 02.51 > > |print $a + $b will add the two values and the turtle prints the value > 2024. > > > |- > > |02.57 > > |I am now running the command , you can see that turtle has printed the > final result. > > > |- > > | 03.05 > > | Let us next see the Mathematical and the Comparison Operators. > > > |- > > | 03.08 > > |The basic mathematical operators here are +, - , * , / > > > |- > > | 03.16 > > | In the editor of a Kturtle let us type the following example – > > > |- > > | 03.20 > > |reset > > > > |- > > | 03.23 > > |canvassize 200,200which resizes the canvas to 200 pixels of width and > height each. > > > > |- > > | 03.32 > > |$add = 1 + 1 > > > > |- > > | 03.40 > > |$subtract = 20 - 5 > > > > |- > > | 03.52 > > |$multiply = 15 * 2 > > > > |- > > | 03.59 > > |$divide = 30 /30 > > > > |- > > | 04.05 > > |go 10,10 > > > > |- > > | 04.09 > > |print $add > > > > |- > > | 04.12 > > |go 50,50 > > > > |- > > | 04.15 > > |print $subtract > > > > |- > > | 04.20 > > |go 100,100 > > > > |- > > | 04.25 > > |print $divide > > > > |- > > | 04.30 > > |go 0,0 > > > |- > > |04.34 > > | Andprint $multiply > > > > |- > > | 04.41 > > |go 175,175 > > > > > |- > > | 04.49 > > | The canvas size 200,200 fix the width and height of the canvas to 200 > pixels each. > > |- > > |04.55 > > | The value 1+1 is assigned to the variable $+, > > |- > > | 04.58 > > | The 20-5 is assigned to variable subtract, > > |- > > | 05.02 > > |The value 15 * 2 will be assigned to the variable multiply. > > |- > > | 05.06 > > | 30/30 is assigned to the variable Divide. > > > |- > > | 05.10 > > | We will not print the variables ,the result which is assigned to them and > the turtle moves in the canvas. > > |- > > | 05.16 > > | Let us now run this code.The command which is getting executed is > highlighted in the editor and the turtle is printing the results. > > > |- > > | 05.34 > > | You can see that the values have been printed on the canvas now. > > > |- > > | 05.39 > > | Let us consider a simple example for using the comparison operator .Type > the commands being shown on the screen > > > |- > > | 05.46 > > |$answer = 10 > 3 > > > > |- > > | 05.51 > > |Andprint $answer > > > |- > > | 06.02 > > |Here 10 is compared with 3 the ’greater than’ operator. > > > > > |- > > | 06.08 > > |The result of this comparison, the boolean value true will be stored in the > variable $answer, and the value true is printed. > > |- > > | 06.15 > > | Let me know Run this piece of code,you can see that the turtle has printed > the value true on the canvas. > > > |- > > | 06.24 > > | lets see how Strings work in this application – > > > |- > > | 06.27 > > |Strings can be put in variables, just like numbers. > > > |- > > | 06.31 > > |Strings cannot be used in mathematical operators or comparison operators > and Strings are highlighted with red. > > > |- > > | 06.38 > > |Strings start and end with the ''' mark, by these marks KTurtle knows > that it is a string. > > > |- > > | 06.45 > > | For example:I am typing the print command followed by a string,See that > the string is highlighted in Red color. > > > |- > > | 06.56 > > | When I run this piece of code, the turtle prints the chain on the canvas. > > > |- > > |07.03 > > | Boolean Values > > > > > |- > > | 07.04 > > |There are only two boolean values: true and false. > > > > > |- > > | 07.07 > > |For example –I am typing the example for using the boolean value in > kturtle. > > > > > |- > > | 07.14 > > |$answer = 10 > 3 > > > > |- > > | 07.20 > > |print $answer > > > |- > > | 07.25 > > |The turtle choose the value true,the boolean value true is assigned the > variable $answer is set to true because 10 is larger than 3. > > > > |- > > |07.36 > > | Executing 'if' and 'else'conditions. > > > |- > > | 07.38 > > |the code that is placed between the brackets will be executed only if > the boolean value evaluates 'true'. > > > |- > > | 07.44 > > |The code between the brackets after else is only executed if the if > condition is false. > > > > |- > > | 07.50 > > |For example – > > > |- > > | 07.53 > > |reset > > > > |- > > | 07.55 > > |$x = 4 I now have a sample piece of code on my editor here , which > compares the numbers 4 and 5 and prints the results accordingly. > > > |- > > | 08.03 > > |Let me now run this code. The turtle has compared the variables 4 and 5 and > its printing the result 4 is smaller than 6 . > > > |- > > | 08.18 > > |Now to the Assignment part. > > > > > |- > > | 08.20 > > |Using the if and else conditions, the mathematical > operators, solve an equation and print the results using the print > and go command. > > |- > > | 08.28 > > |That is you can choose any four random numbers multiply the two sets of > random numbers, compare the results using the comparison operators and print > both the results and print that greater result at center of the canvas you > can choose any equation which you like. > > |- > > | 08.45 > > | I would like to acknowledge the spoken tutorial project > > > |- > > | 08.48 > > |which is part of the talk to a teacher project. > > > |- > > | 08.50 > > |It is supported by the National Mission on Education through ICT, MHRD > government of India. > > > |- > > | 08.56 > > | you can see more information about this on the link shown on the screen. > > > |- > > |08.59 > > | Thank you this is Sindhu signing off. Enjoy exploring KTurtle. > > > |}
-- Thanks and regards Madhuri Ganpathi
