Ruby/C3/while-and-until-Looping-Statements/Kannada

Time	Narration
00:01	'Ruby' (ರೂಬಿ) ಯಲ್ಲಿ, while and until loops ಎಂಬ 'ಸ್ಪೋಕನ್ ಟ್ಯುಟೋರಿಯಲ್' ಗೆ ನಿಮಗೆ ಸ್ವಾಗತ.
00:06	ಈ ಟ್ಯುಟೋರಿಯಲ್ ನಲ್ಲಿ ನಾವು:
00:09	* 'while' ಲೂಪ್
00:10	* 'until' ಲೂಪ್
00:11	* 'redo' (ರೀ-ಡು) ಮತ್ತು
00:12	* 'break' ಇವುಗಳನ್ನು ಬಳಸಲು ಕಲಿಯುವೆವು.
00:13	ನಾವು:
00:14	* Ubuntu ಆವೃತ್ತಿ 12.04
00:17	* Ruby 1.9.3 ಇವುಗಳನ್ನು ಬಳಸುತ್ತಿದ್ದೇವೆ.
00:20	ಈ ಟ್ಯುಟೋರಿಯಲ್ ಅನ್ನು ಅನುಸರಿಸಲು, ನೀವು 'ಇಂಟರ್ನೆಟ್'ನ ಸಂಪರ್ಕವನ್ನು ಪಡೆದಿರಬೇಕು.
00:25	'Linux' ಕಮಾಂಡ್ ಗಳು, ‘ಟರ್ಮಿನಲ್’ ಮತ್ತು 'ಟೆಕ್ಸ್ಟ್ ಎಡಿಟರ್' ಗಳನ್ನು ಸಹ ನೀವು ತಿಳಿದಿರಬೇಕು.
00:29	ಇಲ್ಲದಿದ್ದರೆ, ಸಂಬಂಧಿತ ಟ್ಯುಟೋರಿಯಲ್ ಗಳಿಗಾಗಿ ದಯವಿಟ್ಟು ನಮ್ಮ ವೆಬ್ಸೈಟ್ ಗೆ ಭೆಟ್ಟಿಕೊಡಿ.
00:34	ನಾವು ಪ್ರಾರಂಭಿಸುವ ಮುನ್ನ, ಈಮೊದಲು ನಾವು “ttt” ಎಂಬ ಡಿರೆಕ್ಟರೀಯನ್ನು ಕ್ರಿಯೇಟ್ ಮಾಡಿದ್ದೆವು ಎಂಬುದನ್ನು ನೆನಪಿಸಿಕೊಳ್ಳಿ.
00:38	ನಾವು ಆ ಡಿರೆಕ್ಟರೀಗೆ ಹೋಗೋಣ.
00:41	ಆಮೇಲೆ, 'ruby hyphen tutorial' ಮತ್ತು 'looping hyphen statements' ಎಂಬ ಡಿರೆಕ್ಟರೀಗಳಿಗೆ ಹೋಗೋಣ.
00:46	ಈಗ ನಾವು ಅದೇ ಫೋಲ್ಡರ್ ನಲ್ಲಿ ಇರುವುದರಿಂದ ಮುಂದೆ ನಡೆಯೋಣ.
00:50	Ruby ಯಲ್ಲಿ, 'while' ಲೂಪ್ ನ ಸಿಂಟ್ಯಾಕ್ಸ್ ಈಕೆಳಗಿನಂತಿದೆ:
00:54	'while “boolean expression” '
00:56	'ruby code'
00:57	'end'
00:58	ನಾವು ಒಂದು ಉದಾಹರಣೆಯನ್ನು ನೋಡೋಣ.
01:01	ಪ್ರಾಥಮಿಕ ಹಂತದ Ruby tutorials ನಲ್ಲಿ ತೋರಿಸಿದಂತೆ, 'gedit' ನಲ್ಲಿ ಒಂದು ಹೊಸ ಫೈಲನ್ನು ಕ್ರಿಯೇಟ್ ಮಾಡಿ.
01:05	ಇದನ್ನು 'while hyphen loop dot rb' ಎಂದು ಹೆಸರಿಸಿ.
01:09	ನನ್ನ ಹತ್ತಿರ 'while' ಲೂಪ್ ನ ಒಂದು ಉದಾಹರಣೆ ಇದೆ.
01:13	Now, let us switch to the terminal and type: gedit space while hyphen loop dot rb space & (ampersand)
01:24	ನಾವು ಇದರಲ್ಲಿ ಮುಂದುವರಿಯುತ್ತಿದ್ದಂತೆ, ನೀವು ಟ್ಯುಟೋರಿಯಲ್ ಅನ್ನು ನಿಲ್ಲಿಸಿ (pause) ಕೋಡ್ ಅನ್ನು ಟೈಪ್ ಮಾಡಬಹುದು.
01:28	I have declared a while loop in this example.
01:32	First, I declared a local variable 'i' and initialized it with value 0.
01:38	Then I declare a 'while' loop.
01:41	This loop will execute as long as the variable 'i' is greater than -10.
01:46	The puts method, declared within the while loop, will display the output.
01:51	After the output is displayed, we decrement the value of 'i' by 1.
01:56	'i' will adopt this decremented value before the next iteration.
02:01	The variable 'i' gets decremented in every iteration.
02:04	This goes on till 'i' reaches the value -10.
02:09	At this point, the 'while' condition fails.
02:12	It subsequently breaks out of the loop and stops printing the output.
02:16	Now, let us switch to the terminal and type: ruby space while hyphen loop dot rb and see the output.
02:30	The output will consist of a list of numbers 0 through -9.
02:35	You should now be able to write your own while loop in Ruby.
02:40	Let's look at the until loop next.
02:43	The syntax for the until loop in Ruby is -
02:45	until “boolean expression”
02:47	ruby code
02:48	end
02:50	Let us look at an example.
02:52	Now,let us switch to the terminal and type: gedit space until hyphen loop dot rb space & (ampersand)
03:03	You can pause the tutorial and type the code as we go through it.
03:07	I have declared an until loop in this example.
03:12	We had declared a local variable 'i' and initialized it to 0.
03:16	Then we declare an until loop.
03:18	This loop will execute as long as the variable 'i' is greater than -10.
03:23	The 'puts' method will display the output.
03:27	After the output is displayed, value of 'i' is decremented by 1.
03:32	'i' will adopt this decremented value before the next iteration.
03:36	The variable 'i' gets decremented during every iteration.
03:40	This goes on till 'i' reaches the value -11.
03:43	At this point, the 'until' condition fails.
03:46	Subsequently, it breaks out of the loop and stops printing the output.
03:51	Now, switch to the terminal and type: ruby space until hyphen loop dot rb and see the output.
04:03	The output will consist of a list of numbers 0 through -10.
04:08	You should now be able to write your own until loop in Ruby.
04:13	Let's now move on to the redo construct.
04:16	The syntax for redo in Ruby is as follows:
04:20	a collection of objects. each do item
04:25	a conditional statement
04:27	ruby code
04:28	redo
04:29	end conditional
04:30	end loop
04:32	I have a working example of the redo loop.
04:35	Now, let us switch to the terminal and type: gedit space redo hyphen loop dot rb space &(ampersand )
04:48	You can pause the tutorial and type the code as we go through it.
04:52	I have declared an each loop in this example.
04:55	We have declared an each loop to iterate through numbers 10 to 20.
05:00	Then, we define an if conditional statement.
05:04	The loop will execute for every number between 10 to 20.
05:08	It will enter the inner conditional if conditional block only if the value of 'i' is equal to 20.
05:15	The 'puts' method, declared within the each loop, displays the output.
05:20	Once the program enters the 'if' conditional block, it will first print the output.
05:24	Then it will execute redo.
05:28	redo will execute the iteration of the most internal loop.
05:31	It will do so, without checking the loop condition.
05:34	Our condition being if i == 20.
05:38	The result will be an infinite loop, since the value of 'i' will not change from 20.
05:43	Let's switch to the terminal and type: ruby space redo hyphen loop dot rb
05:52	and see the output.
05:53	The output will consist of an infinite loop that never ends.
05:58	Press Ctrl + C to terminate the infinite loop.
06:03	Now, let us look at the break statement.
06:06	The syntax for the break statement in Ruby is -
06:10	a looping statement
06:12	a conditional statement
06:13	break
06:14	end conditional
06:16	ruby code
06:17	end loop
06:18	Let us look at an example.
06:21	Now, let us switch to the terminal and type: gedit space break hyphen loop dot rb space ampersand.
06:33	You can pause the tutorial and type the code as we go through this example.
06:38	I have declared an each loop in this example.
06:41	It is similar to the one we used earlier.
06:43	The 'puts' method here, will display the output for numbers 11 to 19.
06:49	Once the value becomes 20, the program enters the conditional 'if' block.
06:54	At this point, it will encounter the break statement and break out of the loop.
06:59	Now, open the terminal and type:
07:02	ruby space break hyphen loop dot rb
07:05	and see the output.
07:08	The output will consist of numbers 10 through 19.
07:13	Now you should be able to create your own break construct.
07:17	This brings us to the end of this Spoken Tutorial.
07:20	Let's summarize.
07:22	In this tutorial, we have learnt to use:
07:24	* while loop
07:25	* until construct
07:26	* redo
07:27	* break construct.
07:29	As as assignment-
07:31	Consider a range of numbers 100 to 115(inclusive), represented as Fahrenheit.
07:38	Write a Ruby program using
07:40	the appropriate loop construct
07:42	that uses the Fahrenheit to Celsius conversion formula
07:46	against the given range of numbers.
07:49	To display the output: “The temperature has reached a certain degree Celsius and has become unbearable”
07:55	when the temperature in Celsius is above 32 degree Celsius.
08:00	Watch the video available at the following link.
08:03	It summarizes the Spoken Tutorial project.
08:07	If you do not have good bandwidth, you can download and watch it.
08:10	The Spoken Tutorial project team:
08:13	* Conducts workshops using spoken tutorials.
08:15	* Gives certificates to those who pass an online test.
08:19	For more details, please write to contact@spoken-tutorial.org
08:25	Spoken Tutorial project is a part of the Talk to a Teacher project.
08:29	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
08:35	More information on this mission is available at spoken hyphen tutorial dot org slash NMEICT hyphen Intro.
08:44	This is Anjana Nair, signing off. Thank you.

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Outline:

• while & until loops in Ruby
• Usage of while loop with an example
• Usage of until loop with an example
• Usage of redo construct with an example
• Usage of break with an example

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Contributors and Content Editors

NaveenBhat, Sandhya.np14