Sneha at 07:17, 8 May 2013

2013-05-08T07:17:35Z

Chandrika: Created page with ''''Title of script''': Relational Operators in Java '''Author''': TalentSprint '''Keywords: '''boolean, comparison, relational operator, video tutorial {| style="border-spac…'

2012-11-27T10:23:02Z

Created page with ''''Title of script''': Relational Operators in Java '''Author''': TalentSprint '''Keywords: '''boolean, comparison, relational operator, video tutorial {| style="border-spac…'

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'''Title of script''': Relational Operators in Java

'''Author''': TalentSprint

'''Keywords: '''boolean, comparison, relational operator, video tutorial

{| style="border-spacing:0;"
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Visual Cue '''
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Description'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Slide 1

'''Welcome'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Welcome to the spoken tutorial on '''Relational Operators in Java'''.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Slide 2

'''Learning Outcomes'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| In this tutorial, we will learn about the

* '''the boolean data type'''
* '''Relational operators '''and
* how to '''compare data '''using '''Relational operators.'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Slide 3

'''Tools Used'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| For this tutorial we are using

'''Ubuntu 11.10''',

'''JDK 1.6''' and

'''Eclipse 3.7'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Slide 4

'''Prerequisites'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| To follow this tutorial, you must have knowledge of '''data types '''in''' Java'''

If not, for relevant tutorials, please visit our

website which as shown.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Slide 5

Boolean data type
| style="border:0.035cm solid #000000;padding:0.097cm;"| Relational operators are used to check for conditions.

Their output is a variable of boolean data type

A variable of boolean data type is of 1 bit size.

It stores only two values.

'''True '''or '''False. '''

'''True''' is the output when the condition is true.

'''False''' is the output if the condition is not true.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Slide 6

Relational Operators
| style="border:0.035cm solid #000000;padding:0.176cm;"| Here is a list of the Relational operators available.

* greater than
* less than
* equal to
* greater than or equal to
* less than or equal to
* not equal to

We shall look into each of them in detail.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| Switch to Eclipse.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Minimize Slides and open Eclipse

Eclipse should contain the following code

'''public class BooleanDemo{'''

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

'''}'''

'''}'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| We have the '''Eclipse IDE '''and the skeleton required for the rest of the code.

I have created a class '''BooleanDemo''' and added the '''Main''' method.

Now let us add some expressions.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| In the main method, type

'''boolean b<nowiki>;</nowiki>'''

'''Highlight boolean b'''

| style="border:0.035cm solid #000000;padding:0.097cm;"| '''boolean b<nowiki>;</nowiki>'''

The keyword '''boolean''' declares the data type of the variable '''b''' as '''boolean.'''

We shall store the result of our condition in b.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| In the next line, type

'''int weight = 45;'''

'''b = weight > 40;'''

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

'''Highlight whatever you are explaining.'''

'''Highlight weight<nowiki>=45.</nowiki>'''

'''Highlight the expression weight>40.'''

'''Save and Run'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| We shall define a variable weight and check for a condition using that variable.

'''int weight '''''equal to '''''45;'''

We shall check if the value in weight is greater than '''40.'''

'''b '''''equal to '''''weight '''''greater than '''''40;'''

This statement says check if the value of variable is greater than 40 and store the result in b<nowiki>;</nowiki>

Let us print the value of b.

'''System '''''dot '''''out '''''dot '''''println(b);'''

'''Save''' and '''Run'''.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Point to output'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| As we can see, the output is '''True'''.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Change 45 to 30
| style="border:0.035cm solid #000000;padding:0.176cm;"| Let us see what is the happens if the value is less than 40.

Change weight to 30.

Save and run

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| We see that the output is False as expected.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| '''Highlight > symbol.'''
| style="border:0.035cm solid #000000;padding:0.176cm;"| This way, the''''' '''greater than'' symbol is used to check if one value is ''greater than'' the other.

Similarly, ''less than'' symbol is used to check if one value is'' less than ''the other.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''weight > 40''' to '''weight<nowiki> < 40</nowiki>'''

'''Highlight the condition.'''

'''Save and Run'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Now, let us change ''greater than'' to ''less than symbol.''

We are checking if the value of '''weight''' is less than '''40'''.

Let us '''Save''' and '''Run''' the program.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Point to output'''

'''Change 30 to 45'''

'''Save and Run'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| As we can see, the output is '''True '''as expected.

Let us change the value of weight to 45 and see the output.

Save and Run.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| We see that we get a False because the condition,

'''weight''''' less than '''''40''' is not true.

Now let us see how to check if a value is equal to another.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''weight<nowiki> < 40</nowiki>''' to '''weight == 40'''

'''Save and Run. '''
| style="border:0.035cm solid #000000;padding:0.097cm;"| To do that, we use '''two equal to symbols.'''

change ''less than ''symbol'' ''to ''double equal to.''

'''Save''' and '''Run''' the program.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, the output is '''False '''because the value of weight is not equal to 40'''.'''

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| Now let us change the weight to 40 and see the output.

Change 45 to 40.

Save. Run.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Point to output'''

'''Highlight =='''
| style="border:0.035cm solid #000000;padding:0.097cm;"| As we can see, the output is True

This way, Double equal to is used for checking equality.

Please be careful because, often people use a '''single equal to''' symbol for checking equality.

And this gives unnecessary errors.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''weight == 40''' to '''weight<nowiki> <= 4</nowiki>0'''

'''Highlight condition'''

'''Save''' and '''Run'''.
| style="border:0.035cm solid #000000;padding:0.097cm;"| Next we'll see how to check for '''less than or equal to.'''

To do that, we will use a '''less than''' symbol followed by an '''equal to''' symbol.

Let us change the double equal to to less than equal to.

'''Save''' and '''Run'''.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Point to output
| style="border:0.035cm solid #000000;padding:0.097cm;"| As we can see, the output is '''True''' as expected.

Now let us change the value of weight to see if the '''less than''' check is performed.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''weight = 40''' to '''weight = 30'''

'''Save and Run'''. '''Point to output'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''40''' to '''30.'''

'''Save''' and '''Run.'''

We see, that although the weight is not equal to 40 we get the output as '''True''' because it is less than 40.

Let us see what happens if the value of weight is greater than 40.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Change 40 to 50.
| style="border:0.035cm solid #000000;padding:0.176cm;"| Change 30 to 50.

Save and Run.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, the output is False as expected because the value of weight is not equal to 40.

And it also not less than 40.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| Similarly we use a greater than symbol followed by an equal to symbol for checking '''greater than''' or''' equal to'''.

Let us try it.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''weight<nowiki> <= 4</nowiki>0''' to '''weight >= 40'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change ''less than equal to'' to ''greater than equal to''

Save and Run.

As we can see, the output is '''true '''because '''weight''' is greater than '''40'''

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| '''Change 45 to 30'''
| style="border:0.035cm solid #000000;padding:0.176cm;"| Let us change weight to a value less than 40. Lets say 30.

Save and Run.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| We get a false because the value of weight is not greater than 40 and also not equal to 40.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''weight >= 40''' to '''weight != 40'''

'''Save and Run.'''

'''Highlight b = ...'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Next, we’ll see how to check for '''not equal to'''

It is done by using an '''exclamation mark''' followed by an '''equal to''' symbol.

Change ''greater than'' to ''exclamation mark''

So this statement says check if the value of '''weight''' is not equal to '''40''' and store the result in '''b'''

'''Save''' and '''Run''' the code.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Point to output
| style="border:0.035cm solid #000000;padding:0.097cm;"| As we can see, the output is '''true''' because the values of weight is not equal to 40.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| Let us change the weight to 40 and see the output.

Change to 40.

Save. Run.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| We get a '''false''' because the condition weight not equal to 40 is false.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| The not equal to condition can be thought of as opposite of equal to condition.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"|
| style="border:0.035cm solid #000000;padding:0.176cm;"| This is how we use the various relational operators to compare data in Java.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Minimize the '''Eclipse''' window and switch to slides.

Slide 6

'''Summary'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| We have come to the end of this tutorial.

In this tutorial we have learnt,

about the boolean data type

The relational operators and

how to use '''relational operators''' to '''compare''' two values

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Slide 7'''Assignment'''

| style="border:0.035cm solid #000000;padding:0.097cm;"| As an assignment for this tutorial, find out if the two expressions shown are equivalent?

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| 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 summarises the Spoken Tutorial project

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

| style="border:0.035cm solid #000000;padding:0.097cm;"| To know more 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 summarises the Spoken Tutorial project

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

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| 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:0.035cm solid #000000;padding:0.097cm;"| 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 '''contact AT spoken HYPHEN tutorial DOT org.'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| 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:0.035cm solid #000000;padding:0.097cm;"| '''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 '''spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Slide 11'''About the contributor'''

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

* Thanks for joining

| style="border:0.035cm solid #000000;padding:0.097cm;"| This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.

|}

@@ Line 51: / Line 51: @@
 If not, for relevant tutorials, please visit our
-website which as shown.
+website   as shown.
 |-
@@ Line 63: / Line 63: @@
-A variable of boolean data type is of 1 bit size.
+A   boolean data type is of size  1 bit
@@ Line 109: / Line 109: @@
 '''}'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| We have the '''Eclipse IDE '''and the skeleton required for the rest of the code.
+| style="border:0.035cm solid #000000;padding:0.097cm;"| Here we have the '''Eclipse IDE '''and the skeleton required for the rest of the code.
@@ Line 126: / Line 126: @@
-| style="border:0.035cm solid #000000;padding:0.097cm;"| '''boolean b<nowiki>;</nowiki>'''
+| style="border:0.035cm solid #000000;padding:0.097cm;"|Type '''boolean b<nowiki>;</nowiki>'''
@@ Line 170: / Line 170: @@
-Let us print the value of b.
+Now Let us print the value of b.
@@ Line 184: / Line 184: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"| Change 45 to 30
-| style="border:0.035cm solid #000000;padding:0.176cm;"| Let us see what is the happens if the value is less than 40.
+| style="border:0.035cm solid #000000;padding:0.176cm;"| Let us see what   happens if the value is less than 40.
@@ Line 194: / Line 194: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"|
-| style="border:0.035cm solid #000000;padding:0.176cm;"| We see that the output is False as expected.
+| style="border:0.035cm solid #000000;padding:0.176cm;"| We can see that the output is False as expected.
 |-
@@ Line 210: / Line 210: @@
 '''Save and Run'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| Now, let us change ''greater than'' to ''less than symbol.''
+| style="border:0.035cm solid #000000;padding:0.097cm;"|  let us change ''greater than'' to ''less than symbol.''
-We are checking if the value of '''weight''' is less than '''40'''.
+ So We are checking if the value of '''weight''' is less than '''40'''.
-Let us '''Save''' and '''Run''' the program.
+  '''Save'''  '''Run'''
 |-
@@ Line 254: / Line 254: @@
-'''Save''' and '''Run''' the program.
+'''Save''' and '''Run'''
 |-
@@ Line 265: / Line 265: @@
-Change 45 to 40.
-Save. Run.
+Save and  Run.
 |-
@@ Line 299: / Line 299: @@
-Let us change the double equal to to less than equal to.
+  change the double equal to to less than equal to.
@@ Line 306: / Line 306: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Point to output
-| style="border:0.035cm solid #000000;padding:0.097cm;"| As we can see, the output is '''True''' as expected.
+| style="border:0.035cm solid #000000;padding:0.097cm;"|  the output is '''True''' as expected.
@@ Line 327: / Line 327: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"| Change 40 to 50.
-| style="border:0.035cm solid #000000;padding:0.176cm;"| Change 30 to 50.
+| style="border:0.035cm solid #000000;padding:0.176cm;"|   Let say 50
-−
-−
 Save and Run.
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"|
-| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, the output is False as expected because the value of weight is not equal to 40.
+| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, the output is False   because the value of weight is not equal to 40.
@@ Line 386: / Line 384: @@
-'''Save''' and '''Run''' the code.
+'''Save''' and '''Run'''
 |-
@@ Line 396: / Line 394: @@
 | style="border:0.035cm solid #000000;padding:0.176cm;"| Let us change the weight to 40 and see the output.
-Change to 40.
+Change 30to 40.
 Save. Run.
@@ Line 419: / Line 417: @@
 '''Summary'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| We have come to the end of this tutorial.
+| style="border:0.035cm solid #000000;padding:0.097cm;"| This brings us  to the end of this tutorial.

Java/C2/Relational-Operations/English - Revision history

Sneha at 07:17, 8 May 2013

Chandrika: Created page with ''''Title of script''': Relational Operators in Java '''Author''': TalentSprint '''Keywords: '''boolean, comparison, relational operator, video tutorial {| style="border-spac…'