Difference between revisions of "Java/C2/Relational-Operations/English-timed"
From Script | Spoken-Tutorial
Line 4: | Line 4: | ||
|| '''Narration''' | || '''Narration''' | ||
|- | |- | ||
− | | | + | | 00:01 |
− | | Welcome to the spoken tutorial on '''Relational Operators | + | | Welcome to the spoken tutorial on '''Relational Operators in Java'''. |
|- | |- | ||
− | |00:07 | + | | 00:07 |
− | | In this tutorial, we will learn about | + | | In this tutorial, we will learn about the |
− | |||
− | |||
− | |||
|- | |- | ||
− | |00: | + | | 00:09 |
− | | | + | | '''the boolean data type''' |
− | + | ||
|- | |- | ||
− | |00: | + | | 00:10 |
− | | | + | | '''Relational operators '''and |
− | + | ||
|- | |- | ||
− | |00: | + | | 00:12 |
− | | | + | | how to '''compare data '''using '''Relational operators.''' |
− | |||
− | |||
− | |||
|- | |- | ||
− | |00: | + | | 00:17 |
− | | | + | | For this tutorial we are using |
− | + | '''Ubuntu 11.10''', | |
− | + | ||
− | + | ||
− | + | '''JDK 1.6''' and | |
− | + | ||
− | + | ||
− | + | '''Eclipse 3.7''' | |
− | + | ||
− | + | ||
|- | |- | ||
− | |00: | + | | 00:26 |
− | | | + | | To follow this tutorial, you must have knowledge of '''data types '''in''' Java''' |
+ | |||
|- | |- | ||
− | |00: | + | | 00:31 |
− | | | + | | If not, for relevant tutorials, please visit our website as shown. |
|- | |- | ||
− | |00: | + | | 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: | + | | 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: | + | | 01:17 |
− | | | + | | * not equal to |
|- | |- | ||
− | | | + | | 01:19 |
− | | | + | | We shall look into each of them in detail. |
|- | |- | ||
− | |01: | + | |01:22 |
− | | | + | | Switch to Eclipse. |
|- | |- | ||
− | |01: | + | |01:27 |
− | | | + | | Here we have the '''Eclipse IDE '''and the skeleton required for the rest of the code. |
+ | |||
|- | |- | ||
− | | 01: | + | | 01:33 |
− | | | + | | I have created a class '''BooleanDemo''' and added the '''Main''' method. |
+ | |||
|- | |- | ||
− | |01: | + | | 01:38 |
− | | | + | | Now let us add some expressions. |
|- | |- | ||
− | |01: | + | | 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: | + | | 02:05 |
− | | | + | | '''int weight '''''equal to '''''45;''' |
+ | |||
|- | |- | ||
− | | 02: | + | | 02:13 |
− | | | + | | We shall check if the value in weight is greater than '''40.''' |
+ | |||
|- | |- | ||
− | |02: | + | | 02:18 |
− | | | + | | '''b '''''equal to '''''weight '''''greater than '''''40;''' |
+ | |||
|- | |- | ||
− | | 02: | + | | 02:28 |
− | | | + | | This statement says check if the value of variable is greater than 40 and store the result in b; |
+ | |||
|- | |- | ||
− | | 02: | + | | 02:37 |
− | | | + | | Now Let us print the value of b. |
+ | |||
|- | |- | ||
− | | 02: | + | | 02:41 |
− | | | + | | '''System '''''dot '''''out '''''dot '''''println(b);''' |
+ | |||
|- | |- | ||
− | | 02: | + | | 02:49 |
− | | | + | | '''Save''' and '''Run'''. |
− | |||
|- | |- | ||
− | | 02: | + | | 02:59 |
− | | | + | | As we can see, the output is '''True'''. |
|- | |- | ||
| 03:02 | | 03:02 | ||
− | | | + | | Let us see what happens if the value is less than 40. |
− | |||
− | |||
− | |||
|- | |- | ||
| 03:07 | | 03:07 | ||
− | | | + | | Change weight to 30. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 03: | + | | 03:12 |
− | | | + | | Save and run |
− | + | ||
− | + | ||
|- | |- | ||
− | | 03: | + | | 03:20 |
− | | | + | | We can see that the output is False as expected. |
|- | |- | ||
− | | 03: | + | | 03:24 |
− | | This | + | | This way, the''''' '''greater than'' symbol is used to check if one value is ''greater than'' the other. |
+ | |||
|- | |- | ||
− | | 03: | + | | 03:30 |
− | | | + | | Similarly, ''less than'' symbol is used to check if one value is'' less than ''the other. |
|- | |- | ||
− | |03: | + | | 03:37 |
− | | | + | | let us change the''greater than'' to ''less than symbol.'' |
+ | |||
|- | |- | ||
| 03:43 | | 03:43 | ||
− | | | + | | So We are checking if the value of '''weight''' is less than '''40'''. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 03: | + | | 03:48 |
− | | | + | | '''Save''' '''Run''' |
|- | |- | ||
− | | 03: | + | | 03:56 |
− | | | + | | As we can see, the output is '''True '''as expected. |
+ | |||
|- | |- | ||
| 04:01 | | 04:01 | ||
− | | | + | | Let us change the value of weight to 45 and see the output. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 04: | + | | 04:09 |
− | | | + | | Save and Run. |
|- | |- | ||
− | | 04: | + | | 04:16 |
− | | | + | | We see that we get a False because the condition, |
− | |||
− | |||
− | |||
− | |||
|- | |- | ||
− | | 04: | + | | 04:21 |
− | | | + | | '''weight''''' less than '''''40''' is not true. |
− | |||
− | |||
− | |||
|- | |- | ||
| 04:25 | | 04:25 | ||
− | | | + | | Now let us see how to check if a value is equal to another. |
|- | |- | ||
− | | 04: | + | | 04:31 |
− | | | + | | To do that, we use '''two equal to symbols.''' |
+ | |||
|- | |- | ||
− | | 04: | + | | 04:35 |
− | | | + | | change ''less than ''symbol'' ''to ''double equal to.'' |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 04: | + | | 04:41 |
− | | | + | | '''Save''' and '''Run''' |
|- | |- | ||
− | | 04: | + | | 04:48 |
− | | | + | | As we can see, the output is '''False '''because the value of weight is not equal to 40'''.''' |
|- | |- | ||
− | | 04: | + | | 04:55 |
− | | | + | | Now let us change the weight to 40 and see the output. |
|- | |- | ||
| 05:01 | | 05:01 | ||
− | | | + | | Save and Run. |
|- | |- | ||
− | |05: | + | | 05:08 |
− | | | + | | As we can see, the output is True |
− | |||
− | |||
− | |||
|- | |- | ||
− | |05: | + | | 05:12 |
− | | This | + | | 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: | + | | 05:22 |
− | | | + | | And this gives unnecessary errors. |
|- | |- | ||
− | |05:26 | + | | 05:26 |
− | | | + | | Next we'll see how to check for '''less than or equal to.''' |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
|- | |- | ||
− | | 05: | + | | 05:30 |
− | | | + | | To do that, we will use a '''less than''' symbol followed by an '''equal to''' symbol. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 05: | + | | 05:35 |
− | | | + | | change the double equal to to less than equal to. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 05: | + | | 05:42 |
− | | | + | | '''Save''' and '''Run'''. |
|- | |- | ||
− | | 05: | + | | 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: | + | | 06:04 |
− | | | + | | '''Save''' and '''Run.''' |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 06: | + | | 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 | | 06:22 | ||
− | | | + | | Let us see what happens if the value of weight is greater than 40. |
|- | |- | ||
− | |06: | + | | 06:274 |
− | | | + | | Let say 50. Save and Run. |
|- | |- | ||
− | | 06: | + | | 06:39 |
− | | | + | |As we can see, the output is False because the value of weight is not equal to 40. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 06: | + | | 06:44 |
− | | | + | | And it also not less than 40. |
|- | |- | ||
− | | 06: | + | | 06:48 |
− | | | + | | Similarly we use a greater than symbol followed by an equal to symbol for checking '''greater than''' or''' equal to'''. |
− | |||
− | |||
− | |||
− | |||
− | |||
|- | |- | ||
− | | 06: | + | | 06:55 |
− | | | + | | Let us try it. |
|- | |- | ||
− | | | + | | 06:57 |
− | | | + | | Change ''less than equal to'' to ''greater than equal to'' |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 07: | + | | 07:04 |
− | | | + | | Save and Run. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 07: | + | | 07:10 |
− | | | + | | As we can see, the output is '''true '''because '''weight''' is greater than '''40''' |
|- | |- | ||
− | | 07: | + | | 07: 16 |
− | | | + | | Let us change weight to a value less than 40. Lets say 30. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 07: | + | | 07:25 |
− | | | + | | Save and Run. |
|- | |- | ||
− | | 07: | + | | 07:32 |
− | | | + | | We get a false because the value of weight is not greater than 40 and also not equal to 40. |
|- | |- | ||
− | | 07 | + | | 07:39 |
− | | | + | | Next, we’ll see how to check for '''not equal to''' |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 07: | + | | 07:46 |
− | | | + | | It is done by using an '''exclamation mark''' followed by an '''equal to''' symbol. |
− | |||
− | |||
− | |||
|- | |- | ||
− | | 07: | + | | 07:53 |
− | | | + | | Change ''greater than'' to ''exclamation '' |
+ | |||
|- | |- | ||
− | | 07: | + | | 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: | + | | 08:23 |
− | | | + | | Let us change the weight to 40 and see the output. |
|- | |- | ||
− | |08: | + | | 08:28 |
− | | | + | | Change 30to 40. |
|- | |- | ||
− | | 08: | + | | 08:31 |
− | | | + | | Save. Run. |
|- | |- | ||
− | | 08: | + | | 08:38 |
− | | | + | | We get a '''false''' because the condition weight not equal to 40 is false. |
|- | |- | ||
− | | 08: | + | | 08:45 |
− | | | + | | The not equal to condition can be thought of as opposite of equal to condition. |
|- | |- | ||
− | | 08: | + | | 08:50 |
− | | | + | | This is how we use the various relational operators to compare data in Java. |
|- | |- | ||
− | | 08: | + | | 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 | + | | 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 | |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | | If you do not have good bandwidth, you can download and watch it | + | |
|- | |- | ||
− | | | + | | 09:36 |
− | | The Spoken Tutorial Project Team | + | | The Spoken Tutorial Project Team, |
+ | |||
+ | |||
|- | |- | ||
− | | 09: | + | | 09:38 |
− | | Conducts workshops using spoken tutorials | + | | Conducts workshops using '''spoken tutorials'''. |
+ | |||
+ | |||
|- | |- | ||
− | | 09: | + | | 09:40 |
− | | Gives certificates for those who pass an online test | + | | Gives certificates for those who pass an online test. For more details, please write to '''contact AT spoken HYPHEN tutorial DOT org.''' |
+ | |||
|- | |- | ||
− | | 09: | + | | 09: 50 |
− | | | + | | '''Spoken Tutorial '''Project is a part of the '''Talk to a Teacher''' project. |
− | + | ||
|- | |- | ||
− | | 09: | + | | 09:54 |
− | + | | It is supported by the '''National Mission on Education through ICT, MHRD, Government of India. ''' | |
− | + | ||
− | + | ||
− | | 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 | + | | This tutorial has been contributed by '''TalentSprint'''. Thanks for joining. |
+ | |||
+ | |||
− | |||
|} | |} |
Revision as of 17:04, 29 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.
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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.
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09:54 | It is supported by the National Mission on Education through ICT, MHRD, Government of India.
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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.
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