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

PoojaMoolya at 13:57, 20 February 2017

2017-02-20T13:57:14Z

Sandhya.np14 at 12:30, 6 April 2015

2015-04-06T12:30:44Z

Sandhya.np14 at 13:05, 28 March 2015

2015-03-28T13:05:40Z

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Gaurav at 09:09, 9 July 2014

2014-07-09T09:09:22Z

Sneha: Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on''' do-while Loop '''in java'''.''' |- | 00:06 | | In this tutorial, you will lear…'

2013-05-30T05:33:39Z

Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on''' do-while Loop '''in java'''.''' |- | 00:06 | | In this tutorial, you will lear…'

New page

{| 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.

|}

@@ Line 10: / Line 10: @@
 |-
 |  00:06
-| | In this tutorial, you will learn about:
+| In this tutorial, you will learn about:
-* '''do-while loop''' and
+'''do-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 125: / Line 125: @@
 |-
 | 02:37
-| | We see that the numbers from 1 to 10 are printed.
+| We see that the numbers from 1 to 10 are printed.
 |-
@@ Line 201: / Line 201: @@
 |-
 |  04:15
-|  |First clear the '''main method'''.
+| First clear the '''main method'''.
 |-
@@ Line 245: / Line 245: @@
 |-
 |05:10
-|  | As long as '''x''' into '''x''' is less than '''n''', we keep incrementing the value of 'x'.
+| As long as '''x''' into '''x''' is less than '''n''', we keep incrementing the value of 'x'.
 |-

@@ Line 43: / Line 43: @@
 |-
 | 00:42
-|First is the '''loop''' running '''condition'''. And the second is the '''loop variable'''.
+|First is the '''loop running condition'''. And the second is the '''loop variable'''.
 |-
@@ Line 51: / Line 51: @@
 |-
 | 00:58
-|And so the condition is checked after the execution of the statements inside the '''do''' block.
+|And so, the condition is checked after the execution of the statements inside the '''do''' block.
 |-
@@ Line 79: / Line 79: @@
 |-
 | 01:29
-|'''int n''' equal to '''1'''.
+|'''int n''' equal to '''1;'''.
 |-
 | 01:32
-|'n' is going to be '''loop variable'''.
+|'n' is going to be the '''loop variable'''.
 |-
@@ Line 110: / Line 110: @@
 |-
 | 02:10
-| Outside the braces, type: '''while''' in parentheses ('''n''' less than equal to '''10''')
+| So, outside the braces, type: '''while''' in parentheses '''n''' less than or equal to '''10'''.
 |-
 | 02:20
-|  and close the '''do-while''' using a semi-colon.
+|  and close the '''do-while''' using a semicolon.
 |-
@@ Line 129: / Line 129: @@
 |-
 | 02:42
-|  now  Let us understand how the code is executed.
+|  Now, let us understand how the code is executed.
 |-
@@ Line 161: / Line 161: @@
 |-
 | 03:19
-|Change n = 1 to n = 50.
+|So, change n = 1 to n = 50.
 |-
@@ Line 169: / Line 169: @@
 |-
 | 03:29
-|So Change '''n = n + 1''' to '''n = n - 1'''.
+|So, change '''n = n + 1''' to '''n = n - 1'''.
 |-
@@ Line 229: / Line 229: @@
 |-
 | 04:49
-|Inside the braces, '''x''' equal to '''x ''' plus ''' 1'''
+|Inside the braces, '''x''' equal to '''x ''' plus ''' 1;'''
 |-
@@ Line 237: / Line 237: @@
 |-
 | 04:58
-|'''while''' in paranthesis '''(x into x  < n)'''
+|'''while''' in parentheses '''x into x is less than n'''
 |-
@@ Line 249: / Line 249: @@
 |-
 |   05:16
-|  So, when the loop stops, the reverse of this condition will be true.
+|  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
+| Which means, either 'x into x' must be equal to 'n'
 |-
@@ Line 273: / Line 273: @@
 |-
 | 05:47
-| '''System.out.println(x * x == n);'''
+| '''System.out.println (x * x == n);'''
 |-
@@ Line 285: / Line 285: @@
 |-
 | 06:07
-|Let us try with other perfect square.
+|Let us try with another perfect square.
 |-
@@ Line 297: / Line 297: @@
 |-
 | 06:20
-|We see that we get the '''true''' again .
+|We see that we get a '''true''' again .
 |-
@@ Line 341: / Line 341: @@
 |-
 | 07:16
-|The '''loop condition''' fails and loop does not run.
+|The '''loop condition''' fails and the loop does not run.
 |-
@@ Line 361: / Line 361: @@
 |-
 | 07:40
-|In this tutorial, we learnt about the
+|In this tutorial, we have learnt about
 |-
@@ Line 380: / Line 380: @@
 |-
 | 08:01
-| It summarizes the spoken-tutorial project.If you do not have good bandwidth, you can download and watch it.
+| 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.
+| The Spoken Tutorial project team:
 |-
 | 08:10
-| Conducts workshops using spoken tutorials, gives certificates for those who pass an online test.
+| Conducts workshops using spoken tutorials, gives certificates to those who pass an online test.
 |-
 | 08:16

@@ Line 1: / Line 1: @@
 {| border=1
-|| ''Time'''
+|| '''Time'''
 || '''Narration'''