Sandhya.np14 at 18:17, 5 April 2015

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Sandhya.np14 at 18:18, 22 March 2015

2015-03-22T18:18:22Z

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PoojaMoolya at 09:30, 8 October 2014

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Gaurav at 09:01, 9 July 2014

2014-07-09T09:01:47Z

Kavita salve at 10:44, 21 October 2013

2013-10-21T10:44:41Z

Sneha at 06:18, 17 September 2013

2013-09-17T06:18:20Z

Priyacst at 05:04, 3 September 2013

2013-09-03T05:04:53Z

Sneha at 05:37, 10 July 2013

2013-07-10T05:37:32Z

Sneha at 11:05, 11 June 2013

2013-06-11T11:05:18Z

Sneha: Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00:02 | Welcome to this spoken tutorial on '''Logical Operators''' in Java. |- | 00:07 | In this tutorial, you will lear…'

2013-06-11T11:04:39Z

Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00:02 | Welcome to this spoken tutorial on '''Logical Operators''' in Java. |- | 00:07 | In this tutorial, you will lear…'

New page

{| border=1
|| ''Time'''
|| '''Narration'''

|-
| 00:02
| Welcome to this spoken tutorial on '''Logical Operators''' in Java.

|-
| 00:07
| In this tutorial, you will learn about the''' logical operators

|-
| 00:11
| '''how to check for multiple expressions using logical operators''' and '''how to overwrite precedence using parentheses'''

|-
| 00:20
| For this tutorial we are using

'''Ubuntu 11.10''',

'''JDK 1.6''' and

'''Eclipse 3.7'''

|-
| 00:30
| To follow this tutorial you should have knowledge on '''relational operators in Java'''

|-
| 00:35
| If not, for relevant tutorials, please visit our website as shown.

|-
| 00:40
| Logical operators are used to chec k '''multiple conditions'''.

|-
| 00:48
| Here is a list of the available logical operators in Java

|-
| 00:54
| and, or, not. We shall look into each of them in detail. Switch to Eclipse.

||-
| 01:04
| Here We have the Eclipse IDE and the skeleton required for the rest of the code.

|-
| 01:10
| We have created a class '''LogicalOperators''' and added the main method

|-
|01:15
| Let us create some variables.

|-
| 01:20
| '''boolean b ; '''

|-
| 01:23
| We shall store the result of conditions in b;

|-
| 01:29
| '''''int age''' is equalto '''11 '''

|-
| 01:35
| '''''int weight '''isequalto '''42 '''

|-
| 01:42
| We have the age and weight of a person.

|-
| 01:46
| We shall check if the person '''is below 18yrs of age and is atleast 40kgs'''.

|-
| 01:52
| Let us see how to do so.

|-
| 01:57
| '''b''' is equal to'''age''' ''less than '''''18''' ''ampersand ampersand'' '''weight''' ''greater than equal to'' '''40'''

|-
| 02:19
| This statement has two expressions and a double ampersand symbol in between.

|-
| 02:24
| It checks if age is less than 18 and also if weight is greater than or equal to 40.

|-
| 02:31
| This operation is called the '''and''' operation.

|-
| 02:35
| Let us now print the value b.

|-
| 02:40
| '''''System '''dot '''out '''dot '''println(''b'');'''''

|-
| 02:48
|'''Save '''and '''Run '''

|-
| 02:56
| As we can see, the output is '''true''' because both the conditions are satisfied.

|-
| 03:02
| Now let us change the weight so that one condition is not satisfied and re run the code.

|-
| 03:08
| Change '''42''' to '''32.'''

|-
| 03:14
| '''Save''' and '''Run'''

|-
| 03:21
| the output now is false.

|-
| 03:24
| This is because the condition age less than 18 is satisfied

|-
| 03:29
| But the condition the weight greater than or equal to 40 is not satisfied

|-
| 03:34
| The '''and''' operation requires both the conditions to be '''true''' for the result to be true.

|-
| 03:39
| Therefore we get false as our output.

|-
| 03:43
| This way, using a double ampersand symbol we can perform '''and''' operation.

|-
| 03:53
| Lets say we have age and weight and it is enough if only one of the conditions is satisfied.

|-
| 03:59
| In other words, we need to see if the first condition '''or''' the second condition is '''true.'''

|-
| 04:05
| It is done using the '''or''' operation.

|-
| 04:09
| Let us first remove the earlier condition.

|-
| 04:15
| And Type

|-
| 04:17
| '''age''' ''less than equal to'' '''15''' ''pipe pipe'' '''weight''' ''less than equal to '''''30'''

|-
| 04:35
| There are two conditions and a double pipe symbol in between.

|-
| 04:40
| This statement checks if atleast one of the given two conditions is satisfied.

|-
| 04:46
| Let us run the code to see the output. Save and run

|-
| 04:54
| We see that the output is True.

|-
| 04:57
| This is because, an '''or''' operation, does not need both the conditions to be true like the and operation.

|-
| 05:03
| It needs atleast one condition to be true.

|-
| 05:06
| So although the condition for weight is not satisfied, since the condition for age is satisfied.

|-
| 05:13
| we get the output as true.

|-
| 05:18
| Now let us change the age in such a way that both the conditions are false and see the result.

|-
| 05:25
| change '''11''' to '''17'''

|-
| 05:30
| '''Save''' and '''Run '''

|-
| 05:36
| Now the output is false because both the conditions are not satisfied.

|-
| 05:41
| This way, we use a double PIPE symbol to do an '''or''' operation.

|-
| 05:50
| Now let us say we need to check for people who are older than 15 and with weight more than 30kilos.

|-
| 05:57
| In other words, we need to check the exact opposite of the condition we just did.

|-
| 06:03
| In such situations, we use the '''not''' operation

|-
| 06:07
| First enclose the condition in parentheses.

|-
| 06:17
| And Add an exclamation mark before the condition.

|-
| 06:25
| By using an exclamation mark, we check for the exact opposite of the condition inside the parentheses.

|-
| 06:32
| Since the earlier output was '''false''', now it must '''true'''. Let us see

|-
| 06:38
| '''Save''' and '''Run'''.

|-
| 06:44
| As we can see, the output is the opposite of earlier one.

|-
| 06:48
| This way by using the''' Exclamation mark''' we perform '''not''' operation. Now Let us say we want people '''younger than 15.'''

|-
| 06:58
| Or people '''younger than 18''' and '''lighter than 40kilos'''.

|-
| 07:04
| Let us see how would we go about this condition.

|-
| 07:07
| Remove the earlier condition and type

|-
| 07:12
| '''age '''''less than '''''15 '''

|-
| 07:15
| ''or''''' age '''''less than '''''18 '''

|-
| 07:24
| ''and''''' weight '''''less than '''''40'''

|-
| 07:33
| As we can see, the condition itself is confusing.

|-
| 07:36
| Moreover, we do not know if the '''or''' operation will be performed first or the '''and''' operation.

|-
| 07:42
| It depends on the precedence of operators.

|-
| 07:46
| In such situations, we use parentheses to overwrite the precedence and also make the condition clear.

|-
| 07:53
| So let us add the parentheses.

|-
| 08:06
| Let us run the code save run
|-
| 08:13
| Now Although the first condition which is age less than 18 is not satisfied,

|-
| 08:20
| the second condition, which is,

|-
| 08:22
| age less than 18 and weight less than 40 is satisfied.

|-
| 08:27
| Therefore, output is True.

|-
| 08:30
| As a rule, use parentheses to avoid ambiguity and make the expressions clear.

|-
| 08:36
| | And This how we use the logical operators to check for multiple conditions.

|-
| 08:44
| This bring us to the end of this tutorial.

|-
| 08:47
| we have learnt '''about logical operators''', how to '''check for multiple expressions''' using '''logical operators '''and

|-
| 08:54
| '''how to override the precedence using parentheses.'''

|-
|09:00
|As an assignment for this tutorial,

|-
| 09:02
| find out if the two expressions, shown are equivalent?

|-
| 09:10
| To know more about the '''Spoken Tutorial''' project, watch the video available at the following link, It summarises the '''Spoken Tutorial'''project.

|-
| 09:18
| if you do not have good bandwidth, you can download and watch it

|-
| 09:23
| The Spoken Tutorial Project Team. Conducts workshops using '''spoken tutorials''' and gives certificates for those who pass an online test.

|-
| 09:30
| For more details, please write to '''contact AT spoken HYPHEN tutorial DOT org.'''

|-
| 09:36
| '''Spoken Tutorial '''Project is a part of the '''Talk to a Teacher''' project
|-
| 09:40
| It is supported by the '''National Mission on Education through ICT, MHRD, Government of India.
|-
| 09:46
| '''More information on this Mission is available at the following link '''spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro'''

|-
| 09:52
|This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.

|}

@@ Line 171: / Line 171: @@
 |-
 | 03:59
-| In other words, we need to see if the first condition '''or''' the second condition is '''true.'''
+| In other words, we need to see if the first condition  or the second condition is '''true.'''

@@ Line 12: / Line 12: @@
 |-
 | 00:11
-| '''how to check for multiple expressions using logical operators''' and '''how to overwrite precedence using parentheses'''
+| '''how to check for multiple expressions using logical operators''' and '''how to override precedence using parentheses'''
 |-

@@ Line 349: / Line 349: @@
 |-
 | 08:13
-| Now Although the first condition which is age less than 18 is not satisfied,
+| Now Although the first condition which is age less than 15 is not satisfied,

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

@@ Line 1: / Line 1: @@
 {| border=1
 || ''Time'''
@@ Line 35: / Line 34: @@
 |-
 | 00:40
-| Logical operators are used to chec k '''multiple conditions'''.
+| Logical operators are used to check '''multiple conditions'''.
 |-
@@ Line 71: / Line 70: @@
 | 01:35
 | '''''int weight '''isequalto '''42 '''
-−
 |-

@@ Line 1: / Line 1: @@
 {| border=1
 || ''Time'''
 || '''Narration'''
 |-
 | 00:02
@@ Line 30: / Line 28: @@
 | 00:30
 |   To follow this tutorial you should have knowledge on '''relational operators in Java'''
 |-
@@ Line 39: / Line 36: @@
 | 00:40
 | Logical operators are used to chec k '''multiple conditions'''.
 |-
@@ Line 49: / Line 45: @@
 | and, or, not. We shall look into each of them in detail. Switch to Eclipse.
-||-
+|-
 | 01:04
 |   Here We have the Eclipse IDE and  the skeleton required for the rest of the code.
 |-
@@ Line 65: / Line 60: @@
 |  01:20
 |  '''boolean b ; '''
 |-
 | 01:23
 | We shall store the result of conditions in b;
 |-
@@ Line 79: / Line 71: @@
 | 01:35
 | '''''int weight '''isequalto '''42 '''
@@ Line 86: / Line 76: @@
 |  01:42
 |   We have the age and weight of a person.
 |-

Java/C2/Logical-Operations/English-timed - Revision history

Sandhya.np14 at 18:17, 5 April 2015

Sandhya.np14 at 18:18, 22 March 2015

PoojaMoolya at 09:30, 8 October 2014

Gaurav at 09:01, 9 July 2014

Kavita salve at 10:44, 21 October 2013

Sneha at 06:18, 17 September 2013

Priyacst at 05:04, 3 September 2013

Sneha at 05:37, 10 July 2013

Sneha at 11:05, 11 June 2013

Sneha: Created page with ' {| border=1 || ''Time''' || '''Narration''' |- | 00:02 | Welcome to this spoken tutorial on '''Logical Operators''' in Java. |- | 00:07 | In this tutorial, you will lear…'