Difference between revisions of "Java/C2/Relational-Operations/Gujarati"

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{| border=1
 +
|| ''Time'''
 +
|| '''Narration'''
 +
|-
 +
| 00:01
 +
|  Welcome to the spoken tutorial on '''Relational Operators in Java'''.
  
 +
|-
 +
|  00:07
 +
|  In this tutorial, we will learn about the
 +
 +
 +
|-
 +
| 00:09
 +
|  '''the boolean data type'''
 +
|-
 +
| 00:10
 +
| '''Relational operators '''and
 +
|-
 +
| 00:12
 +
|  how to '''compare data '''using '''Relational operators.'''
 +
 +
 +
|-
 +
|  00:17
 +
|  For this tutorial we are using
 +
 +
'''Ubuntu 11.10''',
 +
 +
'''JDK 1.6''' and
 +
 +
'''Eclipse 3.7'''
 +
 +
|-
 +
| 00:26
 +
|  To follow this tutorial, you must have knowledge of '''data types '''in''' Java'''
 +
 +
 +
|-
 +
| 00:31
 +
|  If not, for relevant tutorials, please visit our  website  as shown.
 +
 +
|-
 +
|  00:39
 +
| Relational operators are used to check for conditions.
 +
 +
 +
|-
 +
| 00:43
 +
 +
|  Their output is a variable of boolean data type
 +
 +
 +
|-
 +
| 00:48
 +
|  A  boolean data type is of size  1 bit 
 +
 +
 +
|-
 +
| 00:51
 +
|  It stores only two values.
 +
 +
 +
|-
 +
| 00:54
 +
|  '''True '''or '''False. '''
 +
 +
 +
|-
 +
| 00:56
 +
|  '''True''' is the output when the condition is true.
 +
 +
 +
|-
 +
| 00:59
 +
|  '''False''' is the output if the condition is not true.
 +
 +
|-
 +
|  01:06
 +
|  Here is a list of the Relational operators available.
 +
 +
 +
|-
 +
| 01:10
 +
|  * greater than
 +
|-
 +
| 01:12
 +
|  * less than
 +
|-
 +
| 01:13 
 +
|  * equal to
 +
|-
 +
| 00:14
 +
|  * greater than or equal to
 +
|-
 +
| 01:15
 +
|  * less than or equal to
 +
|-
 +
| 01:17
 +
|  * not equal to
 +
 +
|-
 +
| 01:19
 +
|  We shall look into each of them in detail.
 +
 +
|-
 +
|01:22
 +
|  Switch to Eclipse.
 +
 +
|-
 +
|01:27 
 +
|  Here we have the '''Eclipse IDE '''and the skeleton required for the rest of the code.
 +
 +
 +
|-
 +
| 01:33
 +
|  I have created a class '''BooleanDemo''' and added the '''Main''' method.
 +
 +
 +
|-
 +
| 01:38
 +
|  Now let us add some expressions.
 +
 +
|-
 +
| 01:41 
 +
|  Type '''boolean b ; '''
 +
 +
 +
|-
 +
| 01:47
 +
|  The keyword '''boolean''' declares the data type of the variable '''b''' as '''boolean.'''
 +
 +
 +
|-
 +
| 01:53
 +
|  We shall store the result of our condition in b.
 +
 +
|-
 +
|  01:5
 +
|  We shall define a variable weight and check for a condition using that variable.
 +
 +
 +
|-
 +
| 02:05
 +
|  '''int weight '''''equal to '''''45;'''
 +
 +
 +
|-
 +
| 02:13
 +
|  We shall check if the value in weight is greater than '''40.'''
 +
 +
 +
|-
 +
| 02:18
 +
|  '''b '''''equal to '''''weight '''''greater than '''''40;'''
 +
 +
 +
|-
 +
| 02:28
 +
|  This statement says check if the value of variable is greater than 40 and store the result in b;
 +
 +
 +
|-
 +
| 02:37
 +
|  Now Let us print the value of b.
 +
 +
 +
|-
 +
| 02:41
 +
|  '''System '''''dot '''''out '''''dot '''''println(b);'''
 +
 +
 +
|-
 +
| 02:49
 +
|  '''Save''' and '''Run'''.
 +
 +
|-
 +
|  02:59
 +
|  As we can see, the output is '''True'''.
 +
 +
|-
 +
| 03:02
 +
|  Let us see what  happens if the value is less than 40.
 +
 +
 +
|-
 +
| 03:07
 +
|  Change weight to 30.
 +
 +
 +
|-
 +
| 03:12
 +
|  Save and run
 +
 +
|-
 +
|  03:20
 +
|  We can see that the output is False as expected.
 +
 +
|-
 +
|  03:24
 +
|  This way, the''''' '''greater than'' symbol is used to check if one value is ''greater than'' the other.
 +
 +
 +
|-
 +
| 03:30
 +
|  Similarly, ''less than'' symbol is used to check if one value is'' less than ''the other.
 +
 +
|-
 +
|  03:37
 +
| let us change the''greater than'' to ''less than symbol.''
 +
 +
 +
|-
 +
| 03:43
 +
|  So We are checking if the value of '''weight''' is less than '''40'''.
 +
 +
 +
|-
 +
| 03:48
 +
|    '''Save'''  '''Run''' 
 +
 +
|-
 +
|  03:56
 +
|  As we can see, the output is '''True '''as expected.
 +
 +
 +
|-
 +
| 04:01
 +
|  Let us change the value of weight to 45 and see the output.
 +
 +
 +
|-
 +
| 04:09
 +
|  Save and Run.
 +
 +
|-
 +
|  04:16
 +
|  We see that we get a False because the condition,
 +
 +
 +
|-
 +
| 04:21
 +
|  '''weight''''' less than '''''40''' is not true.
 +
 +
 +
|-
 +
| 04:25
 +
|  Now let us see how to check if a value is equal to another.
 +
 +
|-
 +
|  04:31
 +
|  To do that, we use '''two equal to symbols.'''
 +
 +
 +
|-
 +
| 04:35
 +
|  change ''less than ''symbol'' ''to ''double equal to.''
 +
 +
 +
|-
 +
| 04:41
 +
|  '''Save''' and '''Run''' 
 +
 +
|-
 +
|  04:48
 +
|  As we can see, the output is '''False '''because the value of weight is not equal to 40'''.'''
 +
 +
|-
 +
|  04:55
 +
|  Now let us change the weight to 40 and see the output.
 +
 +
|-
 +
| 05:01
 +
|  Save and  Run.
 +
 +
|-
 +
|  05:08
 +
|  As we can see, the output is True
 +
 +
 +
|-
 +
| 05:12
 +
|  This way, Double equal to is used for checking equality.
 +
 +
 +
|-
 +
| 05:16
 +
|  Please be careful because, often people use a '''single equal to''' symbol for checking equality.
 +
 +
 +
|-
 +
| 05:22
 +
|  And this gives unnecessary errors.
 +
 +
|-
 +
|  05:26
 +
|  Next we'll see how to check for '''less than or equal to.'''
 +
 +
 +
|-
 +
| 05:30
 +
|  To do that, we will use a '''less than''' symbol followed by an '''equal to''' symbol.
 +
 +
 +
|-
 +
| 05:35
 +
|    change the double equal to to less than equal to.
 +
 +
 +
|-
 +
| 05:42
 +
|  '''Save''' and '''Run'''.
 +
 +
|-
 +
|  05:50
 +
|    the output is '''True''' as expected.
 +
 +
 +
|-
 +
| 05:53
 +
|  Now let us change the value of weight to see if the '''less than''' check is performed.
 +
 +
|-
 +
|  05:59
 +
| Change '''40''' to '''30.'''
 +
 +
|-
 +
| 06:04
 +
|  '''Save''' and '''Run.'''
 +
 +
 +
|-
 +
| 06:14
 +
|  We see, that although the weight is not equal to 40 we get the output as '''True''' because it is less than 40.
 +
 +
 +
|-
 +
| 06:22
 +
|  Let us see what happens if the value of weight is greater than 40.
 +
 +
|-
 +
|  06:274
 +
|  Let say 50. Save and Run.
 +
 +
|-
 +
| 06:39
 +
|As we can see, the output is False  because the value of weight is not equal to 40.
 +
 +
 +
|-
 +
| 06:44
 +
|  And it also not less than 40.
 +
 +
|-
 +
| 06:48
 +
|  Similarly we use a greater than symbol followed by an equal to symbol for checking '''greater than''' or''' equal to'''.
 +
 +
 +
|-
 +
| 06:55
 +
|  Let us try it.
 +
 +
|-
 +
|  06:57
 +
|  Change ''less than equal to'' to ''greater than equal to''
 +
 +
 +
|-
 +
| 07:04
 +
|  Save and Run.
 +
 +
 +
|-
 +
| 07:10
 +
|  As we can see, the output is '''true '''because '''weight''' is greater than '''40'''
 +
 +
|-
 +
|  07: 16
 +
|  Let us change weight to a value less than 40. Lets say 30.
 +
 +
 +
|-
 +
| 07:25
 +
|  Save and Run.
 +
 +
|-
 +
|  07:32
 +
|  We get a false because the value of weight is not greater than 40 and also not equal to 40.
 +
 +
|-
 +
|  07:39
 +
| Next, we’ll see how to check for '''not equal to'''
 +
 +
 +
|-
 +
| 07:46
 +
|  It is done by using an '''exclamation mark''' followed by an '''equal to''' symbol.
 +
 +
 +
|-
 +
| 07:53
 +
|  Change ''greater than'' to ''exclamation  ''
 +
 +
 +
|-
 +
| 07:59
 +
|  So this statement says check if the value of '''weight''' is not equal to '''40''' and store the result in '''b'''
 +
 +
 +
|-
 +
| 08:08
 +
|  '''Save''' and '''Run''' 
 +
 +
|-
 +
|  08:16
 +
|  As we can see, the output is '''true''' because the values of weight is not equal to 40.
 +
 +
|-
 +
|  08:23
 +
|  Let us change the weight to 40 and see the output.
 +
 +
|-
 +
| 08:28
 +
|  Change 30to 40.
 +
 +
|-
 +
| 08:31
 +
|  Save. Run.
 +
 +
|-
 +
| 08:38
 +
|  We get a '''false''' because the condition weight not equal to 40 is false.
 +
 +
|-
 +
|  08:45
 +
| The not equal to condition can be thought of as opposite of equal to condition.
 +
 +
|-
 +
|  08:50
 +
| This is how we use the various relational operators to compare data in Java.
 +
 +
|-
 +
|  08:58
 +
|  This brings us  to the end of this tutorial.
 +
 +
 +
|-
 +
| 09:01
 +
|  In this tutorial we have learnt,  about the boolean data type
 +
 +
|-
 +
| 09:06
 +
|  The relational operators and
 +
 +
|-
 +
| 09:08
 +
|  how to use '''relational operators''' to '''compare''' two values
 +
 +
|-
 +
|  09:13
 +
|  As an assignment for this tutorial, find out if the two expressions shown are equivalent?
 +
 +
|-
 +
|  09:23
 +
|  To know more about the '''Spoken Tutorial''' project,
 +
 +
 +
|-
 +
| 09:23
 +
|  * Watch the video available at[http://spoken-tutorial.org/What_is_a_Spoken_Tutorial  ]
 +
 +
|-
 +
| 09:28
 +
|  * It summarises the Spoken Tutorial project
 +
 +
|-
 +
| 09:31
 +
|  * If you do not have good bandwidth, you can download and watch it
 +
 +
 +
 +
|-
 +
|    09:36
 +
|  The Spoken Tutorial Project Team,
 +
 +
 +
|-
 +
| 09:38
 +
|  Conducts workshops using '''spoken tutorials'''.
 +
 +
 +
|-
 +
| 09:40
 +
|  Gives certificates for those who pass an online test. For more details, please write to '''contact AT spoken HYPHEN tutorial DOT org.'''
 +
 +
|-
 +
|  09: 50
 +
| '''Spoken Tutorial '''Project is a part of the '''Talk to a Teacher''' project.
 +
 +
 +
|-
 +
| 09:54
 +
|  It is supported by the '''National Mission on Education through ICT, MHRD, Government of India. '''
 +
 +
 +
|-
 +
| 10:00
 +
|  More information on this Mission is available at '''spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro'''
 +
 +
|-
 +
| 10:05
 +
|  This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
 +
 +
 +
 +
 +
|}

Revision as of 12:04, 30 July 2013

Time' Narration
00:01 Welcome to the spoken tutorial on Relational Operators in Java.
00:07 In this tutorial, we will learn about the


00:09 the boolean data type
00:10 Relational operators and
00:12 how to compare data using Relational operators.


00:17 For this tutorial we are using

Ubuntu 11.10,

JDK 1.6 and

Eclipse 3.7

00:26 To follow this tutorial, you must have knowledge of data types in Java


00:31 If not, for relevant tutorials, please visit our website as shown.
00:39 Relational operators are used to check for conditions.


00:43 Their output is a variable of boolean data type


00:48 A boolean data type is of size 1 bit


00:51 It stores only two values.


00:54 True or False.


00:56 True is the output when the condition is true.


00:59 False is the output if the condition is not true.
01:06 Here is a list of the Relational operators available.


01:10 * greater than
01:12 * less than
01:13 * equal to
00:14 * greater than or equal to
01:15 * less than or equal to
01:17 * not equal to
01:19 We shall look into each of them in detail.
01:22 Switch to Eclipse.
01:27 Here we have the Eclipse IDE and the skeleton required for the rest of the code.


01:33 I have created a class BooleanDemo and added the Main method.


01:38 Now let us add some expressions.
01:41 Type boolean b ;


01:47 The keyword boolean declares the data type of the variable b as boolean.


01:53 We shall store the result of our condition in b.
01:5 We shall define a variable weight and check for a condition using that variable.


02:05 int weight equal to 45;


02:13 We shall check if the value in weight is greater than 40.


02:18 b equal to weight greater than 40;


02:28 This statement says check if the value of variable is greater than 40 and store the result in b;


02:37 Now Let us print the value of b.


02:41 System dot out dot println(b);


02:49 Save and Run.
02:59 As we can see, the output is True.
03:02 Let us see what happens if the value is less than 40.


03:07 Change weight to 30.


03:12 Save and run
03:20 We can see that the output is False as expected.
03:24 This way, the greater than symbol is used to check if one value is greater than the other.


03:30 Similarly, less than symbol is used to check if one value is less than the other.
03:37 let us change thegreater than to less than symbol.


03:43 So We are checking if the value of weight is less than 40.


03:48 Save Run
03:56 As we can see, the output is True as expected.


04:01 Let us change the value of weight to 45 and see the output.


04:09 Save and Run.
04:16 We see that we get a False because the condition,


04:21 weight less than 40 is not true.


04:25 Now let us see how to check if a value is equal to another.
04:31 To do that, we use two equal to symbols.


04:35 change less than symbol to double equal to.


04:41 Save and Run
04:48 As we can see, the output is False because the value of weight is not equal to 40.
04:55 Now let us change the weight to 40 and see the output.
05:01 Save and Run.
05:08 As we can see, the output is True


05:12 This way, Double equal to is used for checking equality.


05:16 Please be careful because, often people use a single equal to symbol for checking equality.


05:22 And this gives unnecessary errors.
05:26 Next we'll see how to check for less than or equal to.


05:30 To do that, we will use a less than symbol followed by an equal to symbol.


05:35 change the double equal to to less than equal to.


05:42 Save and Run.
05:50 the output is True as expected.


05:53 Now let us change the value of weight to see if the less than check is performed.
05:59 Change 40 to 30.
06:04 Save and Run.


06:14 We see, that although the weight is not equal to 40 we get the output as True because it is less than 40.


06:22 Let us see what happens if the value of weight is greater than 40.
06:274 Let say 50. Save and Run.
06:39 As we can see, the output is False because the value of weight is not equal to 40.


06:44 And it also not less than 40.
06:48 Similarly we use a greater than symbol followed by an equal to symbol for checking greater than or equal to.


06:55 Let us try it.
06:57 Change less than equal to to greater than equal to


07:04 Save and Run.


07:10 As we can see, the output is true because weight is greater than 40
07: 16 Let us change weight to a value less than 40. Lets say 30.


07:25 Save and Run.
07:32 We get a false because the value of weight is not greater than 40 and also not equal to 40.
07:39 Next, we’ll see how to check for not equal to


07:46 It is done by using an exclamation mark followed by an equal to symbol.


07:53 Change greater than to exclamation


07:59 So this statement says check if the value of weight is not equal to 40 and store the result in b


08:08 Save and Run
08:16 As we can see, the output is true because the values of weight is not equal to 40.
08:23 Let us change the weight to 40 and see the output.
08:28 Change 30to 40.
08:31 Save. Run.
08:38 We get a false because the condition weight not equal to 40 is false.
08:45 The not equal to condition can be thought of as opposite of equal to condition.
08:50 This is how we use the various relational operators to compare data in Java.
08:58 This brings us to the end of this tutorial.


09:01 In this tutorial we have learnt, about the boolean data type
09:06 The relational operators and
09:08 how to use relational operators to compare two values
09:13 As an assignment for this tutorial, find out if the two expressions shown are equivalent?
09:23 To know more about the Spoken Tutorial project,


09:23 * Watch the video available at[1]
09:28 * It summarises the Spoken Tutorial project
09:31 * If you do not have good bandwidth, you can download and watch it


09:36 The Spoken Tutorial Project Team,


09:38 Conducts workshops using spoken tutorials.


09:40 Gives certificates for those who pass an online test. For more details, please write to contact AT spoken HYPHEN tutorial DOT org.
09: 50 Spoken Tutorial Project is a part of the Talk to a Teacher project.


09:54 It is supported by the National Mission on Education through ICT, MHRD, Government of India.


10:00 More information on this Mission is available at spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro
10:05 This tutorial has been contributed by TalentSprint. Thanks for joining.



Contributors and Content Editors

Gaurav, Krupali, PoojaMoolya, Pratik kamble

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