Difference between revisions of "Java/C2/do-while/English-timed"

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|-
 
|-
 
| 00:01
 
| 00:01
−
| Welcome to the spoken tutorial on''' do-while Loop '''in java'''.'''
+
| Welcome to the spoken tutorial on '''do-while Loop''' in java.
  
 
|-
 
|-
 
|  00:06
 
|  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
 
| 00:12
−
| For this tutorial we are using  
+
| 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'''
+
  
 
|-
 
|-
 
|  00:20
 
|  00:20
−
|   To follow this tutorial, you musthave knowledge of''' while loop in java.'''
+
| To follow this tutorial, you must have knowledge of '''while loop''' in java.
−
 
+
  
 
|-
 
|-
 
| 00:25
 
| 00:25
−
|If not, for relevant tutorials please visit our website as shown.
+
|If not, for relevant tutorials, please visit our website as shown.
−
 
+
 
   
 
   
 
|-
 
|-
 
|  00:32
 
|  00:32
−
|   Here is the structure for  do-while loop.  
+
| Here is the '''structure''' for  '''do-while loop'''.  
−
 
+
  
 
|-
 
|-
 
| 00:37
 
| 00:37
−
|Notice that it is similar to a while loop.
+
|Notice that it is similar to a '''while loop'''.
−
 
+
  
 
|-
 
|-
 
| 00:40
 
| 00:40
 
|It has two parts.
 
|It has two parts.
−
 
  
 
|-
 
|-
 
| 00:42
 
| 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'''.
  
 
|-
 
|-
 
| 00:51
 
| 00:51
 
|  The only difference is that the condition is written after the '''do''' block.
 
|  The only difference is that the condition is written after the '''do''' block.
−
 
  
 
|-
 
|-
 
| 00:58
 
| 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.
−
 
+
  
 
|-
 
|-
 
| 01:05
 
| 01:05
−
|Now let us see an example.
+
|Now, let us see an example.
  
 
|-
 
|-
 
| 01:07
 
| 01:07
−
| Switch to eclipse  
+
| Switch to '''eclipse'''.
 
   
 
   
 
|-
 
|-
 
| 01:11
 
| 01:11
−
|   Here we have Eclipse IDE and the skeleton required for the rest of the code.
+
| Here we have '''Eclipse IDE''' and the skeleton required for the rest of the code.
−
 
+
  
 
|-
 
|-
 
| 01:17
 
| 01:17
−
|We have created a class '''DoWhileDemo''' and added the main method to it.
+
|We have created a '''class''' '''DoWhileDemo''' and added the '''main method''' to it.
−
 
+
−
 
+
−
 
+
  
 
|-
 
|-
 
| 01:22
 
| 01:22
−
| We are going to print the numbers from 1 to 10 using a do-while loop.
+
| We are going to print the numbers from 1 to 10 using a '''do-while''' loop.
−
 
+
  
 
|-
 
|-
 
| 01:27
 
| 01:27
−
|Type
+
|Type:
−
 
+
  
 
|-
 
|-
 
| 01:29
 
| 01:29
−
|'''int n ''equalto'' 1  '''''
+
|'''int n''' equal to '''1'''.
−
 
+
  
 
|-
 
|-
 
| 01:32
 
| 01:32
−
|n is going to be   loop variable.
+
|'n' is going to be '''loop variable'''.
  
 
|-
 
|-
 
|  01:36
 
|  01:36
−
| then type '''do '''
+
| Then type: '''do '''
  
 
|-
 
|-
 
| 01:40
 
| 01:40
−
|'''open  and close  braces'''
+
|open  and close  braces
  
 
|-
 
|-
 
| 01:44
 
| 01:44
−
|Inside the braces'''System.out.println(n);'''
+
|Inside the braces '''System.out.println(n);'''
 
|-
 
|-
 
| 01:55
 
| 01:55
−
|We shall print the value of n and then increment it. '''n ''equalto'' n ''plus'' 1;'''
+
|We shall print the value of 'n' and then increment it. '''n''' equal to  '''n''' plus '''1;'''
  
 
|-
 
|-
 
|  02:05
 
|  02:05
 
|  And we do this as long as  
 
|  And we do this as long as  
−
 
  
 
|-
 
|-
 
| 02:08
 
| 02:08
−
|'''n''''' is less than or equal to '''''10'''
+
|'''n''' is less than or equal to '''10'''.
−
 
+
  
 
|-
 
|-
 
| 02:10
 
| 02:10
−
| Outside the braces Type '''while in paranthesis(n ''less than equalto'' 10)'''
+
| Outside the braces, type: '''while''' in parentheses ('''n''' less than equal to '''10''')
 
|-
 
|-
 
| 02:20
 
| 02:20
−
|  And close the do-while using a semi-colon
+
|  and close the '''do-while''' using a semi-colon.
  
 
|-
 
|-
 
| 02:25
 
| 02:25
 
| Let us see the code in action.
 
| Let us see the code in action.
−
 
  
 
|-
 
|-
 
| 02:28
 
| 02:28
−
|Save and Run.
+
|'''Save''' and '''Run'''.
  
 
|-
 
|-
 
| 02:37
 
| 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 156: Line 133:
 
|-
 
|-
 
|  02:47
 
|  02:47
−
|  First, the value 1 is printed and then n becomes 2.
+
|  First, the value 1 is printed and then 'n' becomes 2.
−
 
+
  
 
|-
 
|-
 
| 02:52
 
| 02:52
 
|And then, the condition is checked.
 
|And then, the condition is checked.
−
 
  
 
|-
 
|-
 
| 02:55
 
| 02:55
−
|since it is true, again 2 is printed and n becomes 3.
+
|since it is true, again 2 is printed and 'n' becomes 3.
−
 
+
  
 
|-
 
|-
 
| 03:00
 
| 03:00
−
|And so on till all the 10 numbers are printed and the value of n becomes 11.
+
|And so on till all the 10 numbers are printed and the value of 'n' becomes 11.
−
 
+
  
 
|-
 
|-
 
| 03:06
 
| 03:06
 
|When n = 11, the condition fails and the loop stops.
 
|When n = 11, the condition fails and the loop stops.
−
 
  
 
|-
 
|-
 
| 03:11
 
| 03:11
−
|  Now Let us print numbers from 50 to 40 in decreasing order.
+
|  Now, let us print numbers from 50 to 40 in decreasing order.
  
 
|-
 
|-
 
|  03:17
 
|  03:17
−
|   So we start with 50.
+
| So, we start with 50.
  
 
|-
 
|-
Line 193: Line 165:
 
|-
 
|-
 
|  03:23
 
|  03:23
−
|  Since we are looping from a bigger number to a smaller number, we decrement the loop variable.
+
|  Since we are looping from a bigger number to a smaller number, we decrement the '''loop variable'''.
−
 
+
  
 
|-
 
|-
 
| 03:29
 
| 03:29
−
|So Change '''n = n + 1''' to '''n = n - 1'''
+
|So Change '''n = n + 1''' to '''n = n - 1'''.
  
 
|-
 
|-
 
|  03:34
 
|  03:34
−
|  We loop as long as n is greater than or equal to 40.
+
|  We '''loop''' as long as 'n' is greater than or equal to 40.
−
 
+
  
 
|-
 
|-
 
| 03:40
 
| 03:40
−
| So Change the condition to n >= 40
+
| So, change the condition to '''n >= 40'''.
  
 
|-
 
|-
Line 215: Line 185:
 
|-
 
|-
 
| 03:50  
 
| 03:50  
−
|Save and Run.
+
|'''Save''' and '''Run'''.
  
 
|-
 
|-
Line 223: Line 193:
 
|-
 
|-
 
|  04:02
 
|  04:02
−
|  Now let us try a different logic using the do-while loop.
+
|  Now let us try a different logic using the '''do-while''' loop.
  
 
|-
 
|-
Line 231: Line 201:
 
|-
 
|-
 
|  04:15
 
|  04:15
−
|  |First Clear the main method.
+
|  |First clear the '''main method'''.
  
 
|-
 
|-
 
| 04:19
 
| 04:19
−
|ThenType '''int n = 25;'''
+
|Then, type '''int n = 25;'''
  
 
|-
 
|-
 
|  04:25
 
|  04:25
−
| We shall see if the value in n is a perfect square or not.
+
| We shall see if the value in 'n' is a perfect square or not.
  
 
|-
 
|-
 
|  04:32
 
|  04:32
−
|   Then type'''int x = 0;'''
+
| Then type '''int x = 0;'''
−
 
+
  
 
|-
 
|-
 
| 04:37
 
| 04:37
−
|We shall use x to store the square root of the number if it   is a perfect square.
+
|We shall use 'x' to store the square root of the number if it is a perfect square.
  
 
|-
 
|-
 
|  04:44
 
|  04:44
−
|   Then Type '''do'''
+
| Then type '''do'''
−
 
+
  
 
|-
 
|-
 
| 04:46
 
| 04:46
−
|Open and close braces.
+
|Open and close braces.
  
 
|-
 
|-
 
| 04:49
 
| 04:49
−
|Inside the braces'''x '''''equal to '''''x '''''plus''''' 1'''
+
|Inside the braces, '''x''' equal to '''x ''' plus ''' 1'''
  
 
|-
 
|-
 
| 04:55
 
| 04:55
−
| And outside the braces  
+
| and outside the braces  
−
 
+
  
 
|-
 
|-
 
| 04:58
 
| 04:58
−
|'''while in paranthesis (x ''into  '' x  < n)'''
+
|'''while''' in paranthesis '''(x into x  < n)'''
−
 
+
  
 
|-
 
|-
 
| 05:06
 
| 05:06
−
|And Close the do-while usinga semi-colon
+
|And close the '''do-while''' using a semi-colon.
  
 
|-
 
|-
 
|05:10  
 
|05:10  
−
|  | As long a '''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'.
  
 
|-
 
|-
 
|  05:16
 
|  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
 
|  05:22
−
| Which means either x into x must be equal to n.
+
| Which means, either 'x into x' must be equal to n
−
 
+
  
 
|-
 
|-
 
| 05:26
 
| 05:26
−
|Or it  must be greater than n.
+
|or it  must be greater than 'n'.
  
 
|-
 
|-
 
|  05:28
 
|  05:28
−
|  If '''x '''''into '''''x''' is equal to '''n''', the number is a perfect square.
+
|  If '''x''' into '''x''' is equal to '''n''', the number is a perfect square.
−
 
+
  
 
|-
 
|-
 
| 05:32
 
| 05:32
−
|If it is not equal to n, the number is not a perfect square.
+
|If it is not equal to 'n', the number is not a perfect square.
  
 
|-
 
|-
Line 317: Line 281:
 
|-
 
|-
 
|  05:59
 
|  05:59
−
|   '''Save''' and '''Run'''.  As we can see, the output is '''true'''
+
| '''Save''' and '''Run'''.  As we can see, the output is '''true'''.
−
 
+
  
 
|-
 
|-
 
| 06:07
 
| 06:07
−
|Let us try with other perfect square.
+
|Let us try with other perfect square.
  
 
|-
 
|-
 
|  06:10
 
|  06:10
−
|   '''Change n = 25 to n = 49'''
+
| Change n = 25 to n = 49.
  
 
|-
 
|-
 
|  06:15
 
|  06:15
−
| Save and Run
+
| '''Save''' and '''Run'''.
  
 
|-
 
|-
 
| 06:20
 
| 06:20
−
|We see that we get the true again .
+
|We see that we get the '''true''' again .
  
 
|-
 
|-
Line 342: Line 305:
 
|-
 
|-
 
|  06:26
 
|  06:26
−
| Change 49 to 23. Save and Run and
+
| Change 49 to 23. '''Save''' and '''Run''' and
−
 
+
  
 
|-
 
|-
 
| 06:34
 
| 06:34
−
|We get a false as expected.
+
|we get a '''false''' as expected.
−
 
+
  
 
|-
 
|-
 
|  06:37
 
|  06:37
−
|Now let us see what happens when the value of '''n''' is 0.
+
|Now, let us see what happens when the value of 'n' is 0.
  
 
|-
 
|-
 
|  06:42
 
|  06:42
−
| Change n = 23 to n = 0 Since 0 is not a natural number, we must get a false.
+
| Change n = 23 to n = 0. Since 0 is not a natural number, we must get a '''false'''.
−
 
+
  
 
|-
 
|-
 
| 06:52
 
| 06:52
−
|Let us run the code.
+
|Let us '''run''' the code.
  
 
|-
 
|-
 
| 06:54
 
| 06:54
−
|Save and Run.
+
|'''Save''' and '''Run'''.
  
 
|-
 
|-
 
|  07:00
 
|  07:00
−
| We see that we get false as expected.
+
| We see that we get '''false''' as expected.
  
 
|-
 
|-
 
|  07:05
 
|  07:05
−
| This happens because even before the condition
+
| This happens because even before the condition
  
 
|-
 
|-
 
| 07:08
 
| 07:08
−
|'''x''' ''into''''' x''' ''is less than '''''n '''is checked, the value of x is incremented and it becomes 1
+
|'''x''' into '''x''' is less than '''n ''' is checked, the value of 'x' is incremented and it becomes 1.
−
 
+
  
 
|-
 
|-
 
| 07:16
 
| 07:16
−
|The loop condition fails and loop does not run.
+
|The '''loop condition''' fails and loop does not run.
  
 
|-
 
|-
 
| 07:20
 
| 07:20
−
| This way, by using a do-while loop, we make sure that 0 is not considered as a perfect square.
+
| This way, by using a '''do-while''' loop, we make sure that '''0''' is not considered as a perfect square.
  
 
|-
 
|-
 
|  07:26
 
|  07:26
−
|   This way, a do-while loop is used for solving a range of problems.
+
| This way, a '''do-while''' loop is used for solving a range of problems.
  
 
|-
 
|-
 
| 07:31  
 
| 07:31  
−
|Specially, when the loop must run at least once.
+
|Specially, when the '''loop''' must '''run''' at least once.
  
 
|-
 
|-
 
|  07:37
 
|  07:37
−
|   This brings us to the end of the tutorial.
+
| This brings us to the end of the tutorial.
−
 
+
  
 
|-
 
|-
Line 407: Line 365:
 
|-
 
|-
 
| 07:42
 
| 07:42
−
| The do-while loop and how to use it
+
| the '''do-while''' '''loop''' and how to use it.
  
 
|-
 
|-
 
| 07:46
 
| 07:46
 
|  As an assignment for this tutorial, solve the following problem.
 
|  As an assignment for this tutorial, solve the following problem.
−
 
  
 
|-
 
|-
 
| 07:50
 
| 07:50
−
|Given a binary number, find out its decimal equivalent. Example: '''11010 => 26'''
+
|Given a '''binary''' number, find out its decimal equivalent. Example: '''11010 => 26 '''
  
 
|-
 
|-
 
|  07:56
 
|  07:56
−
| To know more about the '''Spoken Tutorial''' project, watch the video available at the following link.
+
| To know more about the Spoken Tutorial project, watch the video available at the following link.
 
|-
 
|-
 
| 08:01
 
| 08:01
Line 427: Line 384:
 
|-
 
|-
 
|  08:06
 
|  08:06
−
|   The Spoken Tutorial Project Team.
+
| The Spoken Tutorial project team.
 
|-
 
|-
 
| 08:10
 
| 08:10
−
| Conducts workshops using '''spoken tutorials'''  .gives certificates for those who pass an online test.  
+
| Conducts workshops using spoken tutorials, gives certificates for those who pass an online test.  
 
|-
 
|-
 
| 08:16
 
| 08:16
Line 437: Line 394:
 
|-
 
|-
 
|  08:22
 
|  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.
+
| 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
 
| 08:32
−
| '''More information on this Mission is available at the following link  
+
| More information on this mission is available at the following link.
  
 
|-
 
|-
 
|  08:36
 
|  08:36
 
| This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
 
| This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
−
 
−
 
−
 
  
 
|}
 
|}

Revision as of 18:35, 28 March 2015

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 must have 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 equal to 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 equal to 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 parentheses (n less than equal to 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 Then, type 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 using a semi-colon.
05:10 As long as 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

Gaurav, PoojaMoolya, Sandhya.np14, Sneha

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