Sneha at 06:54, 9 May 2013

2013-05-09T06:54:33Z

Arya Ratish at 13:11, 23 January 2013

2013-01-23T13:11:58Z

Arya Ratish: Created page with ''''Title of script''': do-while Loop '''Author''': TalentSprint '''Keywords:''' loop, conditions, do-while loop, video tutorial {| style="border-spacing:0;" | style="border:…'

2013-01-22T13:01:19Z

Created page with ''''Title of script''': do-while Loop '''Author''': TalentSprint '''Keywords:''' loop, conditions, do-while loop, video tutorial {| style="border-spacing:0;" | style="border:…'

New page

'''Title of script''': do-while Loop

'''Author''': TalentSprint

'''Keywords:''' loop, conditions, do-while loop, video tutorial

{| style="border-spacing:0;"
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Visual Cue '''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Description'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 1

'''Welcome'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Welcome to the spoken tutorial on''' do-while Loop '''in java'''.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 2

'''Learning Outcomes'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In this tutorial, you will learn about

* '''the do-while loop and'''
* '''how to use it'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 3

'''Tools Used'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| For this tutorial we are using

'''Ubuntu 11.10''',

'''JDK 1.6''' and

'''Eclipse 3.7'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 4

'''Prerequisites'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To follow this tutorial, you should have knowledge on''' while loop in java.'''

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]

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 5

Point on slide

'''do-while loop'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Here is the structure of a do-while loop.

Notice that it is similar to a while loop.

It has two parts.

First is the loop condition. And the second is the loop variable

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| The only difference is that the condition is written after the '''do''' block.

And so the condition is checked after the execution of the statements.

Now let us see an example.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Point to the code'''

Minimize Slides and open Eclipse

Eclipse should contain the following code

'''public class DoWhileDemo{'''

'''public static void main(String<nowiki>[] </nowiki>args){'''

'''}'''

'''}'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We have Eclipse IDE and the skeleton required for the rest of the code.

We have created a class '''DoWhileDemo''' and added the main method to it.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| In the main method and type,

'''int n = 1;'''

'''do {'''

'''System.out.println(n);'''

'''n = n + 1;'''

'''} while(n<nowiki> <= 10);</nowiki>'''
| style="border:1pt solid #000000;padding:0.176cm;"| We are going to print the numbers from 1 to 10 using a do-while loop.

Type

'''int n ''equalto'' 1 ''semicolon'''''

n is going to be our loop variable.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| '''do '''

'''open curly braces and close'''

'''System.out.println(n);'''

We shall print the value of n and then increment it.

'''n ''equalto'' n ''plus'' 1;'''

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| And we do this as long as

'''n''''' is less than or equal to '''''10'''

Type '''while(n ''less than equalto'' 10)'''

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| '''Add a ''semi-colon'' '''to complete the do-while statement.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Save and Run. Point to output.
| style="border:1pt solid #000000;padding:0.176cm;"| Let us see the code in action.

Save. Run.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| We see that, the numbers from 1 to 10 are printed.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| Let us now understand how the code is executed.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| '''Navigate through the code'''

'''Highlight print statement.'''

'''Highlight condition statement'''
| style="border:1pt solid #000000;padding:0.176cm;"| First, the value 1 is printed and n becomes 2.

And then, the condition is checked.

since it is true, 2 is printed and n becomes 3.

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

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

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| Let us now print numbers from 50 to 40 in decreasing order.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Change n = 1 to n = 50
| style="border:1pt solid #000000;padding:0.176cm;"| So we start with 50.

Change n = 1 to n = 50.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Change '''n = n + 1''' to '''n = n - 1'''
| style="border:1pt solid #000000;padding:0.176cm;"| Since we are looping from a bigger number to a smaller number, we decrement the loop variable.

Change '''n = n + 1''' to '''n = n - 1'''

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Change the '''n<nowiki> <= 10</nowiki>''' to '''n >= 40'''
| style="border:1pt solid #000000;padding:0.176cm;"| We loop as long as n is greater than or equal to 40.

Change the condition to n >= 40

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Save and Run.
| style="border:1pt solid #000000;padding:0.176cm;"| Let us look at the output.

Save and Run.

As we can see, the numbers from 50 to 40 are printed.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| Now let us try a different logic using the do-while loop.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Given a number, we shall find out if it is a perfect square or not.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Inside the main method, type

'''int n = 25;'''
| style="border:1pt solid #000000;padding:0.176cm;"| Clear the main method.

Type

Inside the main method, type

'''int n = 25;'''

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| We shall see if the value in n is a perfect square or not.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| '''int x = 0;'''

| style="border:1pt solid #000000;padding:0.176cm;"| '''int x = 0;'''

We shall use x to store the square root if the number is a perfect square.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| '''do {'''

'''x = x + 1;'''

'''}'''
| style="border:1pt solid #000000;padding:0.176cm;"| Type '''do'''

Open close braces.

'''x '''''equal to '''''x '''''plus''''' 1'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''do {'''

'''x = x + 1;'''

'''} while(x * x<nowiki> < </nowiki>n);'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Then,

'''while(x ''into (star)'' x<nowiki> < </nowiki>n)'''

Close with a semi-colon

|-
| style="border:1pt solid #000000;padding:0.176cm;"| '''Point to the condition then increment statement.'''
| style="border:1pt solid #000000;padding:0.176cm;"| As long a '''x '''''into '''''x '''is less than '''n''', we keep incrementing the value of x.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| So when the loop stops, the reverse of this condition will be true.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| Which means either x into x must be equal to n.

Or x into x must be greater than n.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| If '''x '''''into '''''x''' is equal to '''n''', the number is a perfect square.

It is not equal to n, the number is not a perfect square.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| So finally, we print the condition.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Type

'''System.out.println(x * x == n);'''
| style="border:1pt solid #000000;padding:0.176cm;"| '''System.out.println(x * x == n);'''

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| Let us see the code in action.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Save''' and '''Run'''. Point to output
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| As we can see, the output is '''true'''

Let us with another perfect square.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| '''Change n = 25 to n = 49'''
| style="border:1pt solid #000000;padding:0.176cm;"| '''n = 49;'''

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| Save and Run

We again get a true.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| Let us try with a number which is not a perfect square.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Change '''n = 25''' to '''n = 23'''

Save and Run.

Point to output.
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Change 25 to 23.

We get a false.

Now let us see what happens when the value of '''n''' is 0.

|-
| style="border:1pt solid #000000;padding:0.176cm;"| Change n = 23 to n = 0
| style="border:1pt solid #000000;padding:0.176cm;"| Since 0 is not a natural number, we must get a false.

Let us run the code.

Save. Run.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| We see that we get false as expected.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| This happens because even before the condition

'''x''' ''into''''' x''' ''is less than '''''n '''is checked, the value of x is incremented and it becomes 1

The loop condition fails and loop does not run.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| That way, by using a do-while loop, we make sure that 0 is not considered as a perfect square.

|-
| style="border:1pt solid #000000;padding:0.176cm;"|
| style="border:1pt solid #000000;padding:0.176cm;"| This way, a do-while loop is used for solving a range of problems.

Specially, when the loop must run at least once.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Minimize the '''Eclipse''' window and switch to slides.

Slide 6

'''Summary'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This brings us to the end of the tutorial.

In this tutorial, we learnt about the

do-while loop and how to use it

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 7'''Assignment'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| As an assignment for this tutorial, solve the following problem.

Given a binary number, find out its decimal equivalent. Example: '''11010 => 26'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 8'''About the Spoken Tutorial Project'''

* Watch the video available at[http://spoken-tutorial.org/What_is_a_Spoken_Tutorial ][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial http][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial ://][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial spoken][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial -][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial tutorial][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial .][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial org][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial /][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial What][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial _][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial is][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial _][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial a][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial _][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial Spoken][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial _][http://spoken-tutorial.org/What_is_a_Spoken_Tutorial Tutorial]

* It summarizes the Spoken Tutorial project

* If you do not have good bandwidth, you can download and watch it

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To know more about the '''Spoken Tutorial''' project, watch the video available at the following link. It summarizes the project.If you do not have good bandwidth, you can download and watch it.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 9'''Spoken Tutorial Workshops'''The Spoken Tutorial Project Team

* Conducts workshops using spoken tutorials

* Gives certificates for those who pass an online test

* For more details, please write to [mailto:contact@spoken-tutorial.org contact][mailto:contact@spoken-tutorial.org @][mailto:contact@spoken-tutorial.org spoken][mailto:contact@spoken-tutorial.org -][mailto:contact@spoken-tutorial.org tutorial][mailto:contact@spoken-tutorial.org .][mailto:contact@spoken-tutorial.org org]

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| The Spoken Tutorial Project Team. Conducts workshops using '''spoken tutorials''' and gives certificates for those who pass an online test. For more details, please write to '''contact AT spoken HYPHEN tutorial DOT org.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 10'''Acknowledgement'''

* 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

* More information on this Mission is available at

* [http://spoken-tutorial.org/NMEICT-Intro http][http://spoken-tutorial.org/NMEICT-Intro ://][http://spoken-tutorial.org/NMEICT-Intro spoken][http://spoken-tutorial.org/NMEICT-Intro -][http://spoken-tutorial.org/NMEICT-Intro tutorial][http://spoken-tutorial.org/NMEICT-Intro .][http://spoken-tutorial.org/NMEICT-Intro org][http://spoken-tutorial.org/NMEICT-Intro /][http://spoken-tutorial.org/NMEICT-Intro NMEICT][http://spoken-tutorial.org/NMEICT-Intro -][http://spoken-tutorial.org/NMEICT-Intro Intro]

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Spoken Tutorial '''Project is a part of the '''Talk to a Teacher''' project and is supported by the '''National Mission on Education through ICT, MHRD, Government of India. '''More information on this Mission is available at '''spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Slide 11'''About the contributor'''

* This tutorial has been contributed by '''TalentSprint'''
* '''www.talentsprint.com'''

* Thanks for joining

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.

|}

@@ Line 344: / Line 344: @@
 |-
-| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Change '''n = 25''' to '''n = 23'''
+| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Change '''n = 49''' to '''n = 23'''
@@ Line 351: / Line 351: @@
 Point to output.
-| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Change 25 to 23.
+| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Change 49 to 23.

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

Sneha at 06:54, 9 May 2013

Arya Ratish at 13:11, 23 January 2013

Arya Ratish: Created page with ''''Title of script''': do-while Loop '''Author''': TalentSprint '''Keywords:''' loop, conditions, do-while loop, video tutorial {| style="border-spacing:0;" | style="border:…'