Difference between revisions of "Java/C2/do-while/Gujarati"

From Script | Spoken-Tutorial
Jump to: navigation, search
(Blanked the page)
Line 1: Line 1:
 +
 
 +
{| border=1
 +
|| ''Time'''
 +
|| '''Narration'''
  
 +
|-
 +
| 00:01
 +
| Welcome to the spoken tutorial on''' do-while Loop '''in java'''.'''
 +
 +
|-
 +
|  00:06
 +
| | In this tutorial, you will learn about
 +
 +
* ''  do-while loop and'''
 +
* '''how to use it'''
 +
 +
 +
 +
|-
 +
| 00:12
 +
|  For this tutorial we are using
 +
 +
'''Ubuntu 11.10''',
 +
 +
'''JDK 1.6''' and
 +
 +
'''Eclipse 3.7'''
 +
 +
|-
 +
|  00:20
 +
|  To follow this tutorial, you musthave knowledge of''' while loop in java.'''
 +
 +
 +
|-
 +
| 00:25
 +
|If not, for relevant tutorials please visit our website as shown.
 +
 +
 +
|-
 +
|  00:32
 +
|  Here is the structure for  do-while loop.
 +
 +
 +
|-
 +
| 00:37
 +
|Notice that it is similar to a while loop.
 +
 +
 +
|-
 +
| 00:40
 +
|It has two parts.
 +
 +
 +
|-
 +
| 00:42
 +
|First is the loop running condition. And the second is the loop variable
 +
 +
|-
 +
| 00:51
 +
|  The only difference is that the condition is written after the '''do''' block.
 +
 +
 +
|-
 +
| 00:58
 +
|And so the condition is checked after the execution of the statements inside the do block
 +
 +
 +
|-
 +
| 01:05
 +
|Now let us see an example.
 +
 +
|-
 +
| 01:07
 +
| Switch to eclipse
 +
 +
|-
 +
| 01:11
 +
|  Here we have Eclipse IDE and the skeleton required for the rest of the code.
 +
 +
 +
|-
 +
| 01:17
 +
|We have created a class '''DoWhileDemo''' and added the main method to it.
 +
 +
 +
 +
 +
|-
 +
| 01:22
 +
| We are going to print the numbers from 1 to 10 using a do-while loop.
 +
 +
 +
|-
 +
| 01:27
 +
|Type
 +
 +
 +
|-
 +
| 01:29
 +
|'''int n ''equalto'' 1  '''''
 +
 +
 +
|-
 +
| 01:32
 +
|n is going to be    loop variable.
 +
 +
|-
 +
|  01:36
 +
| then type '''do '''
 +
 +
|-
 +
| 01:40
 +
|'''open  and close  braces'''
 +
 +
|-
 +
| 01:44
 +
|Inside the  braces'''System.out.println(n);'''
 +
|-
 +
| 01:55
 +
|We shall print the value of n and then increment it. '''n ''equalto'' n ''plus'' 1;'''
 +
 +
|-
 +
|  02:05
 +
|  And we do this as long as
 +
 +
 +
|-
 +
| 02:08
 +
|'''n''''' is less than or equal to '''''10'''
 +
 +
 +
|-
 +
| 02:10
 +
| Outside the braces Type '''while in paranthesis(n ''less than equalto'' 10)'''
 +
|-
 +
| 02:20
 +
|  And close the do-while using a semi-colon
 +
 +
|-
 +
| 02:25
 +
| Let us see the code in action.
 +
 +
 +
|-
 +
| 02:28
 +
|Save and Run.
 +
 +
|-
 +
| 02:37
 +
| | We see that, the numbers from 1 to 10 are printed.
 +
 +
|-
 +
| 02:42
 +
|  now  Let us understand how the code is executed.
 +
 +
|-
 +
|  02:47
 +
|  First, the value 1 is printed and then n becomes 2.
 +
 +
 +
|-
 +
| 02:52
 +
|And then, the condition is checked.
 +
 +
 +
|-
 +
| 02:55
 +
|since it is true, again 2 is printed and n becomes 3.
 +
 +
 +
|-
 +
| 03:00
 +
|And so on till all the 10 numbers are printed and the value of n becomes 11.
 +
 +
 +
|-
 +
| 03:06
 +
|When n = 11, the condition fails and the loop stops.
 +
 +
 +
|-
 +
| 03:11
 +
|  Now  Let us  print numbers from 50 to 40 in decreasing order.
 +
 +
|-
 +
|  03:17
 +
|  So we start with 50.
 +
 +
|-
 +
| 03:19
 +
|Change n = 1 to n = 50.
 +
 +
|-
 +
|  03:23
 +
|  Since we are looping from a bigger number to a smaller number, we decrement the loop variable.
 +
 +
 +
|-
 +
| 03:29
 +
|So Change '''n = n + 1''' to '''n = n - 1'''
 +
 +
|-
 +
|  03:34
 +
|  We loop as long as n is greater than or equal to 40.
 +
 +
 +
|-
 +
| 03:40
 +
| So Change the condition to n >= 40
 +
 +
|-
 +
| 03:48
 +
| Let us look at the output.
 +
 +
|-
 +
| 03:50
 +
|Save and Run.
 +
 +
|-
 +
| 03:57
 +
|As we can see, the numbers from 50 to 40 are printed.
 +
 +
|-
 +
|  04:02
 +
|  Now let us try a different logic using the do-while loop.
 +
 +
|-
 +
|  04:10
 +
|  Given a number, we shall find out if it is a perfect square or not.
 +
 +
|-
 +
|  04:15
 +
|  |First Clear the main method.
 +
 +
|-
 +
| 04:19
 +
|ThenType '''int n = 25;'''
 +
 +
|-
 +
|  04:25
 +
|  We shall see if the value in n is a perfect square or not.
 +
 +
|-
 +
|  04:32
 +
|  Then type'''int x = 0;'''
 +
 +
 +
|-
 +
| 04:37
 +
|We shall use x to store the square root of the number if it  is a perfect square.
 +
 +
|-
 +
|  04:44
 +
|  Then Type '''do'''
 +
 +
 +
|-
 +
| 04:46
 +
|Open and  close braces.
 +
 +
|-
 +
| 04:49
 +
|Inside the braces'''x '''''equal to '''''x '''''plus''''' 1'''
 +
 +
|-
 +
| 04:55
 +
| And outside the braces
 +
 +
 +
|-
 +
| 04:58
 +
|'''while in paranthesis (x ''into  '' x  <  n)'''
 +
 +
 +
|-
 +
| 05:06
 +
|And Close the do-while usinga semi-colon
 +
 +
|-
 +
|05:10
 +
|  | As long a '''x '''''into '''''x '''is less than '''n''', we keep incrementing the value of x.
 +
 +
|-
 +
|  05:16
 +
|  So when the loop stops, the reverse of this condition will be true.
 +
 +
|-
 +
|  05:22
 +
| Which means either x into x must be equal to n.
 +
 +
 +
|-
 +
| 05:26
 +
|Or it  must be greater than n.
 +
 +
|-
 +
|  05:28
 +
|  If '''x '''''into '''''x''' is equal to '''n''', the number is a perfect square.
 +
 +
 +
|-
 +
| 05:32
 +
|If it is not equal to n, the number is not a perfect square.
 +
 +
|-
 +
| 05:37
 +
|  So finally, we print the condition.
 +
 +
|-
 +
| 05:47
 +
| '''System.out.println(x * x == n);'''
 +
 +
|-
 +
| 05:55
 +
| Let us see the code in action.
 +
 +
|-
 +
|  05:59
 +
|  '''Save''' and '''Run'''.  As we can see, the output is '''true'''
 +
 +
 +
|-
 +
| 06:07
 +
|Let us try  with other perfect square.
 +
 +
|-
 +
|  06:10
 +
|    '''Change n = 25 to n = 49'''
 +
 +
|-
 +
|  06:15
 +
|  Save and Run
 +
 +
|-
 +
| 06:20
 +
|We  see that we get the  true again .
 +
 +
|-
 +
|  06:23
 +
|  Let us try with a number which is not a perfect square.
 +
 +
|-
 +
|  06:26
 +
| Change 49 to 23. Save and Run and
 +
 +
 +
|-
 +
| 06:34
 +
|We get a false as expected.
 +
 +
 +
|-
 +
|  06:37
 +
|Now let us see what happens when the value of '''n''' is 0.
 +
 +
|-
 +
|  06:42
 +
|  Change n = 23 to n = 0 Since 0 is not a natural number, we must get a false.
 +
 +
 +
|-
 +
| 06:52
 +
|Let us run the code.
 +
 +
|-
 +
| 06:54
 +
|Save and Run.
 +
 +
|-
 +
|  07:00
 +
|  We see that we get false as expected.
 +
 +
|-
 +
|  07:05
 +
|  This happens because even before the condition
 +
 +
|-
 +
| 07:08
 +
|'''x''' ''into''''' x''' ''is less than '''''n '''is checked, the value of x is incremented and it becomes 1
 +
 +
 +
|-
 +
| 07:16
 +
|The loop condition fails and loop does not run.
 +
 +
|-
 +
| 07:20
 +
| This way, by using a do-while loop, we make sure that 0 is not considered as a perfect square.
 +
 +
|-
 +
|  07:26
 +
|  This way, a do-while loop is used for solving a range of problems.
 +
 +
|-
 +
| 07:31
 +
|Specially, when the loop must run at least once.
 +
 +
|-
 +
|  07:37
 +
|  This brings us to the end of the tutorial.
 +
 +
 +
|-
 +
| 07:40
 +
|In this tutorial, we learnt about the
 +
 +
|-
 +
| 07:42
 +
| The do-while loop and how to use it
 +
 +
|-
 +
| 07:46
 +
|  As an assignment for this tutorial, solve the following problem.
 +
 +
 +
|-
 +
| 07:50
 +
|Given a binary number, find out its decimal equivalent. Example: '''11010 => 26'''
 +
 +
|-
 +
|  07:56
 +
| To know more about the '''Spoken Tutorial''' project, watch the video available at the following link.
 +
|-
 +
| 08:01
 +
| It summarizes the spoken-tutorial project.If you do not have good bandwidth, you can download and watch it.
 +
 +
|-
 +
|  08:06
 +
|  The Spoken Tutorial Project Team.
 +
|-
 +
| 08:10
 +
| Conducts workshops using '''spoken tutorials'''  .gives certificates for those who pass an online test.
 +
|-
 +
| 08:16
 +
|For more details, please write to '''contact AT spoken HYPHEN tutorial DOT org.'''
 +
 +
|-
 +
|  08:22
 +
| The  '''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.
 +
|-
 +
| 08:32
 +
| '''More information on this Mission is available at  the following link
 +
 +
|-
 +
|  08:36
 +
| This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
 +
 +
 +
 +
 +
|}

Revision as of 11:28, 7 August 2013

Time' Narration
00:01 Welcome to the spoken tutorial on do-while Loop in java.
00:06 In this tutorial, you will learn about
  • do-while loop and'
  • how to use it


00:12 For this tutorial we are using

Ubuntu 11.10,

JDK 1.6 and

Eclipse 3.7

00:20 To follow this tutorial, you musthave knowledge of while loop in java.


00:25 If not, for relevant tutorials please visit our website as shown.


00:32 Here is the structure for do-while loop.


00:37 Notice that it is similar to a while loop.


00:40 It has two parts.


00:42 First is the loop running condition. And the second is the loop variable
00:51 The only difference is that the condition is written after the do block.


00:58 And so the condition is checked after the execution of the statements inside the do block


01:05 Now let us see an example.
01:07 Switch to eclipse
01:11 Here we have Eclipse IDE and the skeleton required for the rest of the code.


01:17 We have created a class DoWhileDemo and added the main method to it.



01:22 We are going to print the numbers from 1 to 10 using a do-while loop.


01:27 Type


01:29 int n equalto 1


01:32 n is going to be loop variable.
01:36 then type do
01:40 open and close braces
01:44 Inside the bracesSystem.out.println(n);
01:55 We shall print the value of n and then increment it. n equalto n plus 1;
02:05 And we do this as long as


02:08 n is less than or equal to 10


02:10 Outside the braces Type while in paranthesis(n less than equalto 10)
02:20 And close the do-while using a semi-colon
02:25 Let us see the code in action.


02:28 Save and Run.
02:37 We see that, the numbers from 1 to 10 are printed.
02:42 now Let us understand how the code is executed.
02:47 First, the value 1 is printed and then n becomes 2.


02:52 And then, the condition is checked.


02:55 since it is true, again 2 is printed and n becomes 3.


03:00 And so on till all the 10 numbers are printed and the value of n becomes 11.


03:06 When n = 11, the condition fails and the loop stops.


03:11 Now Let us print numbers from 50 to 40 in decreasing order.
03:17 So we start with 50.
03:19 Change n = 1 to n = 50.
03:23 Since we are looping from a bigger number to a smaller number, we decrement the loop variable.


03:29 So Change n = n + 1 to n = n - 1
03:34 We loop as long as n is greater than or equal to 40.


03:40 So Change the condition to n >= 40
03:48 Let us look at the output.
03:50 Save and Run.
03:57 As we can see, the numbers from 50 to 40 are printed.
04:02 Now let us try a different logic using the do-while loop.
04:10 Given a number, we shall find out if it is a perfect square or not.
04:15 First Clear the main method.
04:19 ThenType int n = 25;
04:25 We shall see if the value in n is a perfect square or not.
04:32 Then typeint x = 0;


04:37 We shall use x to store the square root of the number if it is a perfect square.
04:44 Then Type do


04:46 Open and close braces.
04:49 Inside the bracesx equal to x plus 1
04:55 And outside the braces


04:58 while in paranthesis (x into x < n)


05:06 And Close the do-while usinga semi-colon
05:10 As long a x into x is less than n, we keep incrementing the value of x.
05:16 So when the loop stops, the reverse of this condition will be true.
05:22 Which means either x into x must be equal to n.


05:26 Or it must be greater than n.
05:28 If x into x is equal to n, the number is a perfect square.


05:32 If it is not equal to n, the number is not a perfect square.
05:37 So finally, we print the condition.
05:47 System.out.println(x * x == n);
05:55 Let us see the code in action.
05:59 Save and Run. As we can see, the output is true


06:07 Let us try with other perfect square.
06:10 Change n = 25 to n = 49
06:15 Save and Run
06:20 We see that we get the true again .
06:23 Let us try with a number which is not a perfect square.
06:26 Change 49 to 23. Save and Run and


06:34 We get a false as expected.


06:37 Now let us see what happens when the value of n is 0.
06:42 Change n = 23 to n = 0 Since 0 is not a natural number, we must get a false.


06:52 Let us run the code.
06:54 Save and Run.
07:00 We see that we get false as expected.
07:05 This happens because even before the condition
07:08 x into x is less than n is checked, the value of x is incremented and it becomes 1


07:16 The loop condition fails and loop does not run.
07:20 This way, by using a do-while loop, we make sure that 0 is not considered as a perfect square.
07:26 This way, a do-while loop is used for solving a range of problems.
07:31 Specially, when the loop must run at least once.
07:37 This brings us to the end of the tutorial.


07:40 In this tutorial, we learnt about the
07:42 The do-while loop and how to use it
07:46 As an assignment for this tutorial, solve the following problem.


07:50 Given a binary number, find out its decimal equivalent. Example: 11010 => 26
07:56 To know more about the Spoken Tutorial project, watch the video available at the following link.
08:01 It summarizes the spoken-tutorial project.If you do not have good bandwidth, you can download and watch it.
08:06 The Spoken Tutorial Project Team.
08:10 Conducts workshops using spoken tutorials .gives certificates for those who pass an online test.
08:16 For more details, please write to contact AT spoken HYPHEN tutorial DOT org.
08:22 The 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.
08:32 More information on this Mission is available at the following link
08:36 This tutorial has been contributed by TalentSprint. Thanks for joining.



Contributors and Content Editors

Jyotisolanki, Krupali, PoojaMoolya, Pratik kamble

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Java/C2/do-while/Gujarati&oldid=5530"