Java/C2/Numerical-Datatypes/English - Revision history

Sneha at 04:21, 8 May 2013

2013-05-08T04:21:03Z

Sneha at 04:20, 8 May 2013

2013-05-08T04:20:34Z

Chandrika: Created page with ''''Title of script''': Numerical Datatypes in Java '''Author''': TalentSprint '''Keywords: '''datatype, int, float, numerical data, video tutorial {| style="border-spacing:0…'

2012-11-27T10:12:05Z

Created page with ''''Title of script''': Numerical Datatypes in Java '''Author''': TalentSprint '''Keywords: '''datatype, int, float, numerical data, video tutorial {| style="border-spacing:0…'

New page

'''Title of script''': Numerical Datatypes in Java

'''Author''': TalentSprint

'''Keywords: '''datatype, int, float, numerical data, 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 '''Numerical Datatypes 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, you will learn about:

* the various '''Numerical Datatypes '''available in '''Java''' and
* how to use them to '''store numerical data.'''

|-
| 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 3.7.0'''

|-
| 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 '''know how to write and run a simple java program in Eclipse'''.

If not, for relevant tutorial please visit our website as shown

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

'''Numerical Datatypes'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| The data type used to store integers is called '''int'''

The data type used to store decimal numbers is called '''float.'''

Let us define and use integers first.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Minimize slides and switch to '''Eclipse'''.

It should contain the following code.

'''Public class NumericalData {'''

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

'''}'''

'''}'''
| style="border:0.035cm solid #000000;padding:0.176cm;"| Here, we have the Eclipse IDE and skeleton required for the rest of the code.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Point to the '''class NumericalData '''and''' main '''method
| style="border:0.035cm solid #000000;padding:0.097cm;"| We have created a class '''NumericalData''' and added the main method to it.

Now let us see how to store a number.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Type the following code in the main method.

'''int distance = 28;'''
| style="border:0.035cm solid #000000;padding:0.176cm;"| '''int distance''' ''equal to '''''28'''

This statement stores the integer value in the name '''distance.'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Point to the '''distance'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| The name '''distance''' is called as an integer variable.

Now we shall use the variable '''distance''' to print the value stored in it.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Type the following code after '''int...'''

'''System.out.println(distance);'''
| style="border:0.035cm solid #000000;padding:0.176cm;"| '''System '''''dot '''''out '''''dot '''''println. In parantheses distance.'''

This statement prints the value of the variable '''distance'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Save and Run the code.
| style="border:0.035cm solid #000000;padding:0.097cm;"| Now '''Save''' the file and '''Run''' it using '''Control''' '''F11'''.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Point to the output console
| style="border:0.035cm solid #000000;padding:0.176cm;"| We can see that the value 28 has been stored in distance and it has been printed.

Now let us change the value stored in the variable.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''distance = 28''' to '''distance = 24'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| change '''28''' to '''24'''

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Save and run the file.
| style="border:0.035cm solid #000000;padding:0.176cm;"| '''Save''' and '''Run'''

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Point to the output.
| style="border:0.035cm solid #000000;padding:0.176cm;"| We can see that the output is different accordingly.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Replace '''distance = 24''' with

'''distance = -25'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''int '''can also store negative values.

Change 24 to ''minus'' 25

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Save and run the code
| style="border:0.035cm solid #000000;padding:0.176cm;"| '''Save''' it and '''Run it'''.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Point to the output
| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, even negative values can be stored in variables of the type '''int.'''

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''distance = 24''' to '''distance = 9876543210'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Data type '''int '''is enough for most of our programming needs.

But it can only store values up to a limit.

Let us try to store a large value and see what happens.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Point to the''' red line'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| As we can see, there is a red line below the number which indicates an error.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Point to the cross mark on the left
| style="border:0.035cm solid #000000;padding:0.097cm;"| The error message says the number is out of range for a variable of the type '''int'''

'''int '''takes 32 bits of memory and can store values only from -2 power 31 to 2 power 31.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"|
| style="border:0.035cm solid #000000;padding:0.097cm;"| To store large numbers, Java provides the '''long''' data type.

Let use It to store a large value.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change the '''int '''to '''long'''

Change '''9876543210''' to '''9876543210L'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| We have to change the data type to '''long''' and

add a capitol '''L''' at the end of the number.

Save it.

We see that now there is no error.

Let us run it.

We can see that large numbers can be stored in a long variable.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''long distance = … '''to '''int distance = 23.5;'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Now let us store a decimal number in a '''int '''variable.

Change '''long '''to '''int '''and change the number to '''23.5;'''

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Point to the '''error'''.
| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, there is an error. That is because '''int '''can only store integers.

To store decimal numbers, we have to use '''float'''.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''int distance... '''to '''float distance'''

Change '''23.5''' to '''23.5f'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| change the data type to '''float.'''

And add an '''f''' at the end of the value.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Save''' and '''Run'''.
| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Control S''' to save.

We see that there is no error.

run it with''' Control F11'''

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Point to '''output'''
| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, the decimal value has been stored and the value has been printed.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''23.5f''' to '''23.123456789f'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Now let us change the value of float.

Add lot of numbers after the decimal point as shown.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| '''Save''' and '''Run'''.
| style="border:0.035cm solid #000000;padding:0.176cm;"| Save it with '''Control S.'''

'''Control F11''' to run.

|-
| style="border:0.035cm solid #000000;padding:0.176cm;"| Point to '''Output'''.
| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, the output is a little different from what has been stored.

This happens because there is a limit to the precision of a floating point number.

It is rounded off to the closest possible number if it cannot be stored accurately.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''distance''' to '''2distance'''

Point to the cross mark on the left
| style="border:0.035cm solid #000000;padding:0.097cm;"| Now let us see the naming rules for variables.

Add a number '''2''' before the name.

And we see that, there is a '''syntax error.'''

This is because a variable name must only start with an alphabet or an underscore.

But generally underscore is not used to start a variable name.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''2distance''' to '''distance2'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Let us add a '''2''' at the end of the name.

We see that, there is no error.

A variable name can have digits but not at the beginning.

|-
| style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''distance2''' to '''dist_from'''
| style="border:0.035cm solid #000000;padding:0.097cm;"| Let us add an '''underscore''' to the variable name.

As we can see, there is no error.

An underscore in a variable name is permitted.

But any other punctuation in a variable name might give a syntax error or other errors.

This is how you store numerical 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;"| This brings us to the end of this tutorial.

In this tutorial we have learnt about the various '''numerical datatypes.'''

How to use them to '''store numerical data. '''

We have learnt the '''rules for naming a variable'''.

|-
| 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,

Read about other numerical data types and

see how they are different from int and float.

Java tutorials are available at the following link.

|-
| 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 the following link.

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 supported by the '''National Mission on Education through ICT, MHRD, Government of India. '''

More information on this Mission is available at the following link.

|-
| 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 328: / Line 328: @@
 How to use them to '''store numerical data. '''
-We have learnt the '''rules for naming a variable'''.
+We have also learnt the '''rules for naming a variable'''.
 |-

@@ Line 5: / Line 5: @@
 '''Keywords: '''datatype, int, float, numerical data, video tutorial
-−
 {| style="border-spacing:0;"
@@ Line 21: / Line 21: @@
 '''Learning Outcomes'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| In this tutorial, you will learn about:
+| style="border:0.035cm solid #000000;padding:0.097cm;"| In this tutorial, we will learn about:
 * the various '''Numerical Datatypes '''available in '''Java''' and
@@ Line 80: / Line 80: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Point to the '''class NumericalData '''and''' main '''method
-| style="border:0.035cm solid #000000;padding:0.097cm;"| We have created a class '''NumericalData''' and added the main method to it.
+| style="border:0.035cm solid #000000;padding:0.097cm;"| We have created a class '''NumericalData'''  and  added the main method to it.
@@ Line 96: / Line 96: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Point to the '''distance'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| The name '''distance''' is called as an integer variable.
+| style="border:0.035cm solid #000000;padding:0.097cm;"| The name '''distance''' is called  an integer variable.
@@ Line 112: / Line 112: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Save and Run the code.
-| style="border:0.035cm solid #000000;padding:0.097cm;"| Now '''Save''' the file and '''Run''' it using '''Control''' '''F11'''.
+| style="border:0.035cm solid #000000;padding:0.097cm;"|  '''Save''' the file and '''Run''' it
@@ Line 140: / Line 140: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"| Point to the output.
-| style="border:0.035cm solid #000000;padding:0.176cm;"| We can see that the output is different accordingly.
+| style="border:0.035cm solid #000000;padding:0.176cm;"| We  see that the output  has changed accordingly.
 |-
@@ Line 156: / Line 156: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"| Save and run the code
-| style="border:0.035cm solid #000000;padding:0.176cm;"| '''Save''' it and '''Run it'''.
+| style="border:0.035cm solid #000000;padding:0.176cm;"| '''Save''' and '''Run  ''''.
 |-
@@ Line 164: / Line 164: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''distance = 24''' to '''distance = 9876543210'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| Data type '''int '''is enough for most of our programming needs.
+| style="border:0.035cm solid #000000;padding:0.097cm;"|The Data type '''int '''is enough for most of our programming needs.
@@ Line 188: / Line 188: @@
-Let use It to store a large value.
+Let us  use It to store a large value.
 |-
@@ Line 195: / Line 195: @@
 Change '''9876543210''' to '''9876543210L'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| We have to change the data type to '''long''' and
+| style="border:0.035cm solid #000000;padding:0.097cm;"|  Change the '''int '''to '''long''' and
-add a capitol '''L''' at the end of the number.
+add a capital '''L''' at the end of the number.
-Save it.
+Save it with''' Ctrl S'''
@@ Line 206: / Line 206: @@
-Let us run it.
+Let us run it with '''Ctrl F11'''. The value has been printed
@@ Line 237: / Line 237: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| '''Save''' and '''Run'''.
-| style="border:0.035cm solid #000000;padding:0.097cm;"| '''Control S''' to save.
+| style="border:0.035cm solid #000000;padding:0.097cm;"|   save it.
@@ Line 251: / Line 251: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''23.5f''' to '''23.123456789f'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| Now let us change the value of float.
+| style="border:0.035cm solid #000000;padding:0.097cm;"| Now let us change the value of  the variable distance
@@ Line 258: / Line 258: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"| '''Save''' and '''Run'''.
-| style="border:0.035cm solid #000000;padding:0.176cm;"| Save it with '''Control S.'''
+| style="border:0.035cm solid #000000;padding:0.176cm;"| Save it  and Run it
-'''Control F11''' to run.
-−
 |-
 | style="border:0.035cm solid #000000;padding:0.176cm;"| Point to '''Output'''.
-| style="border:0.035cm solid #000000;padding:0.176cm;"| As we can see, the output is a little different from what has been stored.
+| style="border:0.035cm solid #000000;padding:0.176cm;"|   we  see, that  the  output is   little different from what has been stored.
@@ Line 284: / Line 283: @@
-And we see that, there is a '''syntax error.'''
+  we see that, there is a '''syntax error.'''
@@ Line 294: / Line 293: @@
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''2distance''' to '''distance2'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| Let us add a '''2''' at the end of the name.
+| style="border:0.035cm solid #000000;padding:0.097cm;"|now Let us add a '''2''' at the end of the variable name.
@@ Line 300: / Line 299: @@
 A variable name can have digits but not at the beginning.
-−
 |-
 | style="border:0.035cm solid #000000;padding:0.097cm;"| Change '''distance2''' to '''dist_from'''
-| style="border:0.035cm solid #000000;padding:0.097cm;"| Let us add an '''underscore''' to the variable name.
+| style="border:0.035cm solid #000000;padding:0.097cm;"| Now add an underscore in the middle of the name
-−
-As we can see, there is no error.
+ we   see that there is no error.
-An underscore in a variable name is permitted.
+Which means an underscore is permitted  in a variable name
-But any other punctuation in a variable name might give a syntax error or other errors.
+But any other punctuation in a variable that give an syntax error or other errors.