Java/C2/while-loop/English-timed - Revision history

PoojaMoolya at 05:32, 18 October 2017

2017-10-18T05:32:30Z

Sandhya.np14 at 11:27, 7 August 2017

2017-08-07T11:27:34Z

PoojaMoolya at 13:55, 20 February 2017

2017-02-20T13:55:04Z

Pratik kamble at 07:30, 18 October 2016

2016-10-18T07:30:29Z

Sandhya.np14 at 09:43, 6 April 2015

2015-04-06T09:43:19Z

Sandhya.np14 at 17:48, 25 March 2015

2015-03-25T17:48:58Z

Sandhya.np14 at 17:47, 25 March 2015

2015-03-25T17:47:46Z

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Gaurav at 09:06, 9 July 2014

2014-07-09T09:06:38Z

Sneha at 07:14, 13 August 2013

2013-08-13T07:14:14Z

Sneha: Created page with ' {| border=1 || ''Time''' || '''Narration''' |- |- | 00:02 | Welcome to the spoken tutorial on''' While Loop '''in java'''.''' |- | 00:06 | In this tutorial, you will learn …'

2013-05-31T05:33:09Z

Created page with ' {| border=1 || ''Time''' || '''Narration''' |- |- | 00:02 | Welcome to the spoken tutorial on''' While Loop '''in java'''.''' |- | 00:06 | In this tutorial, you will learn …'

New page

{| border=1
|| ''Time'''
|| '''Narration'''

|-
|-
| 00:02
| Welcome to the spoken tutorial on''' While Loop '''in java'''.'''

|-
| 00:06
| In this tutorial, you will learn '''About the while loop.'''

'''How To use it.'''

|-
| 00:12
| For this tutorial we are using

'''Ubuntu 11.10''',

'''JDK 1.6''' and

'''Eclipse 3.7'''

|-
| 00:21
| To follow this tutorial, you must have knowledge of '''relational operators in Java'''

|-
| 00:26
| If not, for relevant tutorials please visit our website as shown. [http://spoken-tutorial.org/ http][http://spoken-tutorial.org/ ://][http://spoken-tutorial.org/ spoken][http://spoken-tutorial.org/ -][http://spoken-tutorial.org/ tutorial][http://spoken-tutorial.org/ .][http://spoken-tutorial.org/ org]

|-
| 00:36
| Here is the structure of a while loop.

|-
| 00:39
| It has two parts.

|-
| 00:41
| One is the '''loop running condition''' and the second is the '''loop variable.'''

|-
| 00:48
| Let us now look at an example. Switch to Eclipse

|-
| 00:55
| Here We have the eclipse IDE and the skeleton required for rest of the code

|-
| 01:00
| I have created a class WhileDemo and added the main method to it.

|-
| 01:05
| | We shall print numbers from 1 to 10 using a while loop. Type '''''int n = 1'' '''''

|-
| 01:15
| This variable n is going to be our loop variable

|-
| 01:21
| type '''''while ''''in ''parenthesis '''n''' less than or equal to'' '''''10''''' open and close braces

|-
| 01:33
| This condition is called looping running condition.

|-
| 01:37
| It means the loop will run as long as this condition is true.

|-
| 01:42
| In our case, it will run as long as the value of '''n''' is less than or equal to 10.

|-
| 01:47
| And it will stop only when the value of '''n''' become greater than 10.

|-
| 01:53
| Inside the loop, we shall print the value of '''n'''

|-
| 01:58
| '''System.out.println(n);''' and then increment '''n = n + 1;'''

|-
| 02:12
| This way, first 1 is printed and then the value of n becomes 2.

|-
| 02:18
| Then the loop condition is checked.

|-
| 02:21
| Since it is true. 2 is printed and n becomes 3.

|-
| 02:25
| And so on loop progresses untill 10 is printed after that n becomes 11 and the condition is not true and the loop will stop

|-
| 02:37
| So Let us see the code in action.

|-
| 02:39
| Save and run.

|-
| 02:47
| As we can see, the numbers from 1 to 10 are printed.

|-
| 02:52
| Now we shall print numbers from '''50''' to '''40'''

|-
| 02:58
| So We start with 50. ''' Change n = 1 to n = 50'''

|-
| 03:03
| And We go till 40.

|-
| 03:05
| In other words as long as n ''is greater than or equal to ''40. So change the condition to n '' greater than or equal to ''40.

|-
| 03:16
| And since we are looping from a bigger number to a smaller number, we have decrement the loop variable.

|-
| 03:22
| So Change '''n=n + 1''' to '''n=n - 1'''

|-
| 03:27
| Save and run. As we can see, the the numbers 50 to 40 have been printed

|-
| 03:42
| Now we shall print the first 10 multiples of 7.

|-
| 03:48
| To do that, we start with 7

|-
| 03:50
| So change '''n = 50''' to '''n = 7'''and then end with 70.

|-
| 03:57
| Change the condition to n''' ''less than equal to '''''70'''

|-
| 04:03
| This way, we make sure the loop stops at 70.

|-
| 04:07
| To get the multiples, we shall increment the loop variable by 7.

|-
| 04:12
| So, change ''' n=n - 1''' to '''n=n + 7'''

|-
| 04:18
| This way first 7 is printed and then n becomes 14, 14 is printed and so on untill 70. Save and run

|-
| 04:33
| | As we can see, the first 10 multiples of 7 are printed.

|-
| 04:43
| We can also use a while loop to get the sum of digits of a number.

|-
| 04:47
| Let us see how to do so.

|-
| 04:49
| First clear the main method.

|-
| 04:54
| int '''n''' ''equal to'' '''13876'''. This is the number

|-
| 05:02
| Then '''int dSum '''''equal to'' '''0'''The variable dsum with symbolic for digit sum will contain the sum of digits

|-
| 05:18
| Type while, n greater than 0 open close parenthesis

|-
| 05:27
| The reason for using this condition will be evident in a while.

|-
| 05:32
| To get the sum of digits, we must first get the digits.
|-
| 05:36
| To do that we use modulo operator.

|-
| 05:40
| Type '''dSum = dSum + (n % 10)''' So we get the unit digit and add it to dsum

|-
| 05:5
|After that we remove the digit by dividing by 10. n = n / 10

|-
| 06:08
| So when the loop is run for the first time, '''dSum '''will be 6 and n will be 1387.

|-
| 06:15
| And when the loop is run for the the second time, '''dSum''' will be sum of 7 and 6 which is 13, and '''n''' will become 138.

|-
| 06:22
| So on, as the loop progresses, the digits will be removed from '''n''' and finally

|-
| 06:28
| '''n''' become zero.After that the condition n greater than 0 will be false and the loop will stop

|-
| 06:36
| So let us now add a print statement
|-
| 06:42
| '''System.out.println(dSum)'''

|-
| 06:51
| Let us see the code and action. Save and run
|-
| 06:59
| As we can see the sum of digit which is 25 has been printed

|-
| 07:06
| This way, a while loop, which is one of the most fundamental constructs in programming, can be used.

|-
| 07:16
| This brings us to the end of the tutorial.

|-
| 07:20
| In this tutorial we have learnt

* About while loop
* how to use it

|-
|07:26
| As an assignment for this tutorial solve the following problem.

|-
| 07:29
| Given a number, compute its reverse by using a while loop. Example: 19435 => 53491

|-
|07:37
|To know more about the '''Spoken Tutorial''' project, watch the video available at the following link, that summarizes the Spoken Tutorial project

|-
| 07:45
| If you do not have good bandwidth, you can download and watch it.

|-
| 07:50
| The Spoken Tutorial Project Team, Conducts workshops using spoken tutorials, Gives certificates for those who pass an online test

|-
| 07:57
| For more details, please write to '''contact AT spoken HYPHEN tutorial DOT org.'''

|-
| 08:03
| '''Spoken Tutorial '''Project is a part of the '''Talk to a Teacher''' project.
|-
| 08:07
| It is supported by the '''National Mission on Education through ICT, MHRD, Government of India.
|-
| 08:12
| '''More information on this Mission is available at the following link

|-
| 08:17
| This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.

|}

@@ Line 10: / Line 10: @@
 |-
 |  00:06
-|  In this tutorial, you will learn:
+|  In this tutorial, you will learn: About the '''while loop''' and How to use it.
-* About the '''while loop''' and
-* How to use it.
 |-
 |  00:12
 |  For this tutorial, we are using:
-*'''Ubuntu 11.10''',
+'''Ubuntu 11.10''', '''JDK 1.6''' and '''Eclipse 3.7'''.
-*'''JDK 1.6''' and
-*'''Eclipse 3.7'''.
 |-
@@ Line 264: / Line 260: @@
 |-
 |  07:20
-| In this tutorial, we have learned:
+| In this tutorial, we have learned: About while loop.How to use it.
 About while loop
 How to use it.
 |-

@@ Line 11: / Line 11: @@
 |  00:06
 |  In this tutorial, you will learn:
-About the '''while loop'''
+* About the '''while loop''' and
-How to use it.
+* How to use it.
 |-
 |  00:12
 |  For this tutorial, we are using:
-'''Ubuntu 11.10''',
+*'''Ubuntu 11.10''',
-'''JDK 1.6''' and
+*'''JDK 1.6''' and
-'''Eclipse 3.7'''
+*'''Eclipse 3.7'''.
 |-

@@ Line 1: / Line 1: @@
 {| border=1
 || '''Time'''
@@ Line 12: / Line 11: @@
 |  00:06
 |  In this tutorial, you will learn:
-* About the '''while loop'''
+About the '''while loop'''
-* How to use it.
+How to use it.
 |-
@@ Line 56: / Line 55: @@
 |-
 |  01:05
-|  | We shall print the numbers from '''1''' to '''10''' using a '''while loop'''. Type: '''int n = 1;'''.
+|  We shall print the numbers from '''1''' to '''10''' using a '''while loop'''. Type: '''int n = 1;'''.
 |-
@@ Line 266: / Line 265: @@
 |  07:20
 | In this tutorial, we have learned:
-* About while loop
+About while loop
-* How to use it.
+How to use it.
 |-

@@ Line 291: / Line 291: @@
 |-
 |  07:57
-| For more details, please write to '''contact AT spoken HYPHEN tutorial DOT org.'''
+| For more details, please write to '''contact@spoken-tutorial DOT org.'''
 |-

@@ Line 11: / Line 11: @@
 |-
 |  00:06
-|  In this tutorial, you will learn: * about the '''while loop'''
+|  In this tutorial, you will learn:
-* how to use it.
+* About the '''while loop'''
 |-

@@ Line 7: / Line 7: @@
 |-
 | 00:02
-| Welcome to the spoken tutorial on '''While Loop''' in java.
+| Welcome to the spoken tutorial on '''while loop''' in java.
 |-
@@ Line 24: / Line 24: @@
 |-
 |  00:21
-|   To follow this tutorial, you must have knowledge of '''relational operators in Java'''.
+|   To follow this tutorial, you must have knowledge of '''relational operators''' in '''Java'''.
 |-
@@ Line 56: / Line 56: @@
 |-
 |  01:05
-|  | We shall print numbers from '''1''' to '''10''' using a '''while loop'''. Type: '''int n = 1'''.
+|  | We shall print the numbers from '''1''' to '''10''' using a '''while loop'''. Type: '''int n = 1;'''.
 |-
@@ Line 68: / Line 68: @@
 |-
 |  01:33
-| This condition is called  '''looping running condition'''.
+| This condition is called  '''loop running condition'''.
 |-
@@ Line 88: / Line 88: @@
 |-
 |  01:58
-| '''System.out.println(n);''' and then increment '''n = n + 1;'''
+| '''System.out.println(n);''' and then increment it '''n = n + 1;'''
 |-
@@ Line 120: / Line 120: @@
 |-
 |  02:52
-| Now we shall  print numbers from '''50''' to '''40'''.
+| Now, we shall  print numbers from '''50''' to '''40'''.
 |-
 |  02:58
-|  So, we start with 50.   Change '''n = 1''' to '''n = 50'''.
+|  So, we start with 50. Change '''n = 1''' to '''n = 50'''.
 |-
 | 03:03
-| And We go till 40.
+| And We go till 40,
 |-
 |  03:05
-| In other words, as long as 'n' is greater than or equal to 40. So, change the condition to  n   greater than or equal to 40.
+| in other words, as long as 'n' is greater than or equal to 40. So, change the condition to  n   greater than or equal to 40.
 |-
@@ Line 144: / Line 144: @@
 |-
 | 03:27
-| '''Save''' and '''run'''. As we can see, the numbers 50 to 40 have been printed.
+| '''Save''' and '''run'''. As we can see, the numbers from 50 to 40 have been printed.
 |-
@@ Line 156: / Line 156: @@
 |-
 |  03:50
-| So, change '''n = 50''' to '''n = 7''' and then end with 70.
+| So, change '''n = 50''' to '''n = 7''' and then we end with 70.
 |-
 |  03:57
-| Change the condition to '''n''' less than equal to '''70'''.
+| Change the condition to '''n''' less than or equal to '''70'''.
 |-
 |  04:03
-| This way, we make sure the '''loop''' stops at 70.
+| This way, we make sure that the '''loop''' stops at 70.
 |-
@@ Line 172: / Line 172: @@
 |-
 |  04:12
-|So, change '''n=n-1''' to '''n= n+7'''.
+|So, change '''n=n-1''' to '''n= n+7;'''
 |-
@@ Line 196: / Line 196: @@
 |-
 |  04:54
-| '''int n''' equal to '''13876'''. This is the number.
+| '''int n''' equal to '''13876;'''. This is the number.
 |-
 | 05:02
-| Then '''int dSum''' equal to  '''0''' The variable '''dsum''' with symbolic for digit sum will contain the sum of digits.
+| Then '''int dSum''' equal to  '''0'''. The variable '''dsum''' which is symbolic for digit sum will contain the sum of digits.
 |-
 |  05:18
-|  Type: '''while n''' greater than '''0''' open close parenthesis.
+|  Type: '''while n''' greater than '''0''' open close parentheses.
 |-
@@ Line 215: / Line 215: @@
 |-
 |  05:36
-| To do that, we use '''modulo operator'''.
+| To do that, we use the '''modulo operator'''.
 |-
 |  05:40
-| Type: '''dSum = dSum + (n % 10)''' So, we get the unit digit and add it to '''dsum'''.
+| Type: '''dSum = dSum + (n % 10)''' So, we get the unit's digit and add it to '''dsum'''.
 |-
@@ Line 227: / Line 227: @@
 |-
 | 06:08
-| So when the '''loop''' is  '''run'''  for the first time, '''dSum''' will be 6 and 'n' will be 1387.
+| So when the '''loop''' is  '''run'''  for the first time, '''dSum''' will be 6 and 'n' will become 1387.
 |-
@@ Line 235: / Line 235: @@
 |-
 |   06:22
-| So on as the loop progresses, the digits will be  removed from '''n''' and finally
+| And so on as the loop progresses, the digits will be  removed from '''n''' and finally
 |-
@@ Line 250: / Line 250: @@
 |-
 |  06:51
-| Let us see the code and action. '''Save''' and '''run'''.
+| Let us see the code in action. '''Save''' and '''run'''.
 |-
 |  06:59
-| As we can see, the sum of digit which is 25 has been printed.
+| As we can see, the sum of digits which is 25 has been printed.
 |-
 | 07:06
-| This way, a '''while loop''' which is one of the most fundamental '''constructs''' in programming, can be used.
+| This way a '''while loop''' which is one of the most fundamental '''constructs''' in programming can be used.
 |-
@@ Line 265: / Line 265: @@
 |-
 |  07:20
-| In this tutorial, we have learnt:
+| In this tutorial, we have learned:
 * About while loop
 * How to use it.
@@ Line 279: / Line 279: @@
 |-
 |07:37
-|To know more about the Spoken Tutorial project, watch the video available at the following link, that summarizes the Spoken Tutorial project.
+|To know more about the Spoken Tutorial project, watch the video available at the following link. It summarizes the Spoken Tutorial project.
 |-
@@ Line 287: / Line 287: @@
 |-
 | 07:50
-|  The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials. Gives certificates for those who pass an online test.
+|  The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials. Gives certificates to those who pass an online test.
 |-

@@ Line 263: / Line 263: @@
 |-
-|   05:5
+|   05:52
 |After that  we remove the digit by dividing   by 10.   n = n / 10