Difference between revisions of "Java/C2/Numerical-Datatypes/English-timed"

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|  How to use them to '''store numerical data.'''
 
|  How to use them to '''store numerical data.'''
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| For this tutorial we are using  
 
| For this tutorial we are using  
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* '''Ubuntu 11.10''',  
 
* '''Ubuntu 11.10''',  
 
* '''JDK 1.6''' and  
 
* '''JDK 1.6''' and  
 
* '''Eclipse 3.7.0'''
 
* '''Eclipse 3.7.0'''
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|-
 
|  00:27
 
|  00:27
 
|  To follow this tutorial, you must '''know how to write and run a simple java program in Eclipse'''.
 
|  To follow this tutorial, you must '''know how to write and run a simple java program in Eclipse'''.
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| 00:34
 
| 00:34
 
| If not, for relevant tutorial please visit our website as shown
 
| If not, for relevant tutorial please visit our website as shown
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|-
 
|-
 
| 00:42
 
| 00:42
 
|  The data type used to store integers is called '''int'''
 
|  The data type used to store integers is called '''int'''
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| 00:47
 
| 00:47
 
| The data type used to store decimal numbers is called '''float.'''
 
| The data type used to store decimal numbers is called '''float.'''
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|-
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| We have created a class '''NumericalData'''  and  added the main method to it.  
 
| We have created a class '''NumericalData'''  and  added the main method to it.  
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|  '''int distance''' ''equal to '''''28'''
 
|  '''int distance''' ''equal to '''''28'''
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|  The name '''distance''' is called  an integer variable.
 
|  The name '''distance''' is called  an integer variable.
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|-
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| '''System '''''dot '''''out '''''dot '''''println. In parentheses '''distance.'''
 
| '''System '''''dot '''''out '''''dot '''''println. In parentheses '''distance.'''
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|  We can see that the value ''' 28''' has been stored in distance and it has been printed.
 
|  We can see that the value ''' 28''' has been stored in distance and it has been printed.
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|  change '''28''' to '''24'''
 
|  change '''28''' to '''24'''
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|'''int '''can also store negative values.
 
|'''int '''can also store negative values.
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| 02:42
 
| Change 24 to ''minus'' 25
 
| Change 24 to ''minus'' 25
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|  The Data type '''int '''is enough for most of our programming needs.
 
|  The Data type '''int '''is enough for most of our programming needs.
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| 03:06  
 
| But it can only store values up to a limit.
 
| But it can only store values up to a limit.
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|  The error message says,the number is out of range for a variable of the type '''int'''
 
|  The error message says,the number is out of range for a variable of the type '''int'''
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| To store large numbers, Java provides the '''long''' data type.
 
| To store large numbers, Java provides the '''long''' data type.
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| add a capital '''L''' at the end of the number.
 
| add a capital '''L''' at the end of the number.
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| 04:11
 
| Save it with''' Ctrl, S'''
 
| Save it with''' Ctrl, S'''
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| 04:16
 
| We see that now there is no error.
 
| We see that now there is no error.
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|-
 
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| 04:19
 
| Let us run it with '''Ctrl, F11'''. The value has been printed
 
| Let us run it with '''Ctrl, F11'''. The value has been printed
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|  Now let us store a decimal number in a '''int '''variable.
 
|  Now let us store a decimal number in a '''int '''variable.
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|  As we can see, there is an error. That is because '''int '''can only store integers.
 
|  As we can see, there is an error. That is because '''int '''can only store integers.
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| change the data type to '''float.'''
 
| change the data type to '''float.'''
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|  save it.
 
|  save it.
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| We see that now their is no error.
 
| We see that now their is no error.
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| Now let us change the value of  the variable distance  
 
| Now let us change the value of  the variable distance  
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| '''Save''' it  and''' Run''' it
 
| '''Save''' it  and''' Run''' it
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|  we  see, that  the  output is  little different from what has been stored.  
 
|  we  see, that  the  output is  little different from what has been stored.  
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|-
 
| 06:06
 
| 06:06
 
| This happens because there is a limit to the precision of a floating point number.
 
| This happens because there is a limit to the precision of a floating point number.
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|  Now let us see the naming rules for variables.
 
|  Now let us see the naming rules for variables.
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| 06:23
 
| Add a number '''2''' before the name.
 
| Add a number '''2''' before the name.
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|-
 
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| 06:30
 
|  we see that, there is a '''syntax error.'''  
 
|  we see that, there is a '''syntax error.'''  
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| This is because a variable name must only start with an '''alphabet''' or an '''underscore'''.
 
| This is because a variable name must only start with an '''alphabet''' or an '''underscore'''.
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| Now let us add '''the number '''  at the end of the variable name.
 
| Now let us add '''the number '''  at the end of the variable name.
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| We see that, there is no error.
 
| We see that, there is no error.
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|  we  see that there is no error.
 
|  we  see that there is no error.
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| 07:17
 
| Which means an underscore is permitted  in a variable name.
 
| Which means an underscore is permitted  in a variable name.
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| 07:22
 
| But any other''' punctuation''' in a variable name that give an syntax error or other errors.
 
| But any other''' punctuation''' in a variable name that give an syntax error or other errors.
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|  As an assignment for this tutorial,  
 
|  As an assignment for this tutorial,  
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|see how they are different from int and float.
 
|see how they are different from int and float.
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| 08:11     
 
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| It summarises the Spoken Tutorial project
+
| It summarizes the Spoken Tutorial project
  
 
|-
 
|-
 
| 08:14     
 
| 08:14     
 
| 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
−
 
 
    
 
    
 
|-
 
|-
 
|  08:20
 
|  08:20
 
| The Spoken Tutorial Project Team. Conducts workshops using '''spoken tutorials'''.
 
| The Spoken Tutorial Project Team. Conducts workshops using '''spoken tutorials'''.
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|-
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| 08:35
 
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|  '''Spoken Tutorial '''Project is a part of the '''Talk to a Teacher''' project.
 
|  '''Spoken Tutorial '''Project is a part of the '''Talk to a Teacher''' project.
−
 
  
 
|-
 
|-
 
|  08:39   
 
|  08:39   
 
|It supported by the '''National Mission on Education through ICT, MHRD, Government of India. '''
 
|It supported by the '''National Mission on Education through ICT, MHRD, Government of India. '''
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|  08:51
 
|  08:51
 
|  This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
 
|  This tutorial has been contributed by '''TalentSprint'''. Thanks for joining.
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|}
 
|}

Revision as of 14:28, 20 March 2015


Time Narration
00:01 Welcome to the spoken tutorial on Numerical Datatypes in Java.
00:07 In this tutorial, we will learn about:
00:10 The various Numerical Datatypes available in Java and
00:13 How to use them to store numerical data.
00:18 For this tutorial we are using
  • Ubuntu 11.10,
  • JDK 1.6 and
  • Eclipse 3.7.0
00:27 To follow this tutorial, you must know how to write and run a simple java program in Eclipse.
00:34 If not, for relevant tutorial please visit our website as shown
00:42 The data type used to store integers is called int
00:47 The data type used to store decimal numbers is called float.
00:52 Let us define and use integers first.
01:02 Here, we have the Eclipse IDE and the skeleton required for the rest of the code.
01:10 We have created a class NumericalData and added the main method to it.
01:15 Now let us see how to store a number.
01:20 int distance equal to 28
01:27 This statement stores the integer value in the name distance.
01:33 The name distance is called an integer variable.
01:37 Now we shall use the variable distance to print the value stored in it.
01:47 System dot out dot println. In parentheses distance.
02:01 This statement prints the value of the variable distance
02:06 Save the file and Run it
02:14 We can see that the value 28 has been stored in distance and it has been printed.
02:21 Now let us change the value stored in the variable.
02:25 change 28 to 24
02:29 Save and Run
02:34 We see that the output has changed accordingly.
02:39 int can also store negative values.
02:42 Change 24 to minus 25
02:48 Save and Run '.
02:56 As we can see, even negative values can be stored in variables of the type int.
03:02 The Data type int is enough for most of our programming needs.
03:06 But it can only store values up to a limit.
03:10 Let us try to store a large value and see what happens.
03:25 As we can see, there is a red line below the number which indicates an error.
03:34 The error message says,the number is out of range for a variable of the type int
03:42 int takes 32 bits of memory and can store values only from -2 power 31 to 2 power 31.
03:49 To store large numbers, Java provides the long data type.
03:54 Let us use it to store a large value.
03:59 Change int to long and
04:04 add a capital L at the end of the number.
04:11 Save it with Ctrl, S
04:16 We see that now there is no error.
04:19 Let us run it with Ctrl, F11. The value has been printed
04:27 We can see that large numbers can be stored in a long variable.
04:32 Now let us store a decimal number in a int variable.
04:37 Change long to int and change the number to 23.5;
04:50 As we can see, there is an error. That is because int can only store integers.
05:00 To store decimal numbers, we have to use float.
05:05 change the data type to float.
05:10 And add an f at the end of the value.
05:17 save it.
05:19 We see that now their is no error.
05:22 run it with Control F11
05:29 As we can see, the decimal value has been stored and the value has been printed.
05:37 Now let us change the value of the variable distance
05:46 Add a lot of numbers after the decimal point as shown.
05:53 Save it and Run it
06:01 we see, that the output is little different from what has been stored.
06:06 This happens because there is a limit to the precision of a floating point number.
06:11 It is rounded off to the closest possible number if it cannot be stored accurately.
06:18 Now let us see the naming rules for variables.
06:23 Add a number 2 before the name.
06:30 we see that, there is a syntax error.
06:34 This is because a variable name must only start with an alphabet or an underscore.
06:40 But generally underscore is not used to start a variable name.
06:45 Now let us add the number at the end of the variable name.
06:55 We see that, there is no error.
06:59 A variable name can have digits but not at the beginning.
07:04 Now add an 'underscore' in the middle of the name
07:15 we see that there is no error.
07:17 Which means an underscore is permitted in a variable name.
07:22 But any other punctuation in a variable name that give an syntax error or other errors.
07:28 This is how you store numerical data in Java.
07:35 This brings us to the end of the tutorial.
07:38 In this tutorial we have learnt about the various numerical datatypes.
07:44 And How tostore numerical data.
07:46 And We have also learnt the rules for naming a variable.
07:51 As an assignment for this tutorial,
07:53 Read about other numerical data types and
07:56 see how they are different from int and float.
08:00 Java tutorials are available at the following link.
08:05 To know more about the Spoken Tutorial project, watch the video available at the following link. [1]
08:11 It summarizes the Spoken Tutorial project
08:14 If you do not have good bandwidth, you can download and watch it
08:20 The Spoken Tutorial Project Team. Conducts workshops using spoken tutorials.
08:24 Gives certificates to those who pass an online test. For more details, please write to contact AT spoken HYPHEN tutorial DOT org.
08:35 Spoken Tutorial Project is a part of the Talk to a Teacher project.
08:39 It supported by the National Mission on Education through ICT, MHRD, Government of India.
08:45 More information on this Mission is available at the following link.
08:51 This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Pratik kamble, Sandhya.np14, Sneha

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