Java/C2/Numerical-Datatypes/English

Title of script: Numerical Datatypes in Java

Author: TalentSprint

Keywords: datatype, int, float, numerical data, video tutorial

Visual Cue	Description
Slide 1 Welcome	Welcome to the spoken tutorial on Numerical Datatypes in Java.
Slide 2 Learning Outcomes	In this tutorial, we will learn about: the various Numerical Datatypes available in Java and how to use them to store numerical data.
Slide 3 Tools Used	For this tutorial we are using Ubuntu 11.10, JDK 1.6 and Eclipse 3.7.0
Slide 4 Prerequisites	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
Slide 5 Numerical Datatypes	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.
Minimize slides and switch to Eclipse. It should contain the following code. Public class NumericalData { public static void main(String[] args) { } }	Here, we have the Eclipse IDE and skeleton required for the rest of the code.
Point to the class NumericalData and main method	We have created a class NumericalData and added the main method to it. Now let us see how to store a number.
Type the following code in the main method. int distance = 28;	int distance equal to 28 This statement stores the integer value in the name distance.
Point to the distance	The name distance is called an integer variable. Now we shall use the variable distance to print the value stored in it.
Type the following code after int... System.out.println(distance);	System dot out dot println. In parantheses distance. This statement prints the value of the variable distance
Save and Run the code.	Save the file and Run it
Point to the output console	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.
Change distance = 28 to distance = 24	change 28 to 24
Save and run the file.	Save and Run
Point to the output.	We see that the output has changed accordingly.
Replace distance = 24 with distance = -25	int can also store negative values. Change 24 to minus 25
Save and run the code	Save and Run '.
Point to the output	As we can see, even negative values can be stored in variables of the type int.
Change distance = 24 to distance = 9876543210	The 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.
Point to the red line	As we can see, there is a red line below the number which indicates an error.
Point to the cross mark on the left	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.
	To store large numbers, Java provides the long data type. Let us use It to store a large value.
Change the int to long Change 9876543210 to 9876543210L	Change the int to long and add a capital L at the end of the number. Save it with Ctrl S We see that now there is no error. Let us run it with Ctrl F11. The value has been printed We can see that large numbers can be stored in a long variable.
Change long distance = … to int distance = 23.5;	Now let us store a decimal number in a int variable. Change long to int and change the number to 23.5;
Point to the error.	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.
Change int distance... to float distance Change 23.5 to 23.5f	change the data type to float. And add an f at the end of the value.
Save and Run.	save it. We see that there is no error. run it with Control F11
Point to output	As we can see, the decimal value has been stored and the value has been printed.
Change 23.5f to 23.123456789f	Now let us change the value of the variable distance Add lot of numbers after the decimal point as shown.
Save and Run.	Save it and Run it
Point to Output.	we see, that the output is 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.
Change distance to 2distance Point to the cross mark on the left	Now let us see the naming rules for variables. Add a number 2 before the name. 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.
Change 2distance to distance2	now Let us add a 2 at the end of the variable name. We see that, there is no error. A variable name can have digits but not at the beginning.
Change distance2 to dist_from	Now add an underscore in the middle of the name we see that there is no error. Which means an underscore is permitted in a variable name But any other punctuation in a variable that give an syntax error or other errors. This is how you store numerical data in Java.
Minimize the Eclipse window and switch to slides. Slide 6 Summary	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.
Slide 7Assignment	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.
Slide 8About the Spoken Tutorial Project Watch the video available at[1]http://spoken-tutorial.org/What_is_a_Spoken_Tutorial It summarises the Spoken Tutorial project If you do not have good bandwidth, you can download and watch it	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.
Slide 9Spoken Tutorial WorkshopsThe 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@spoken-tutorial.org	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.
Slide 10Acknowledgement 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	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.
Slide 11About the contributor This tutorial has been contributed by TalentSprint www.talentsprint.com Thanks for joining	This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Chandrika, Sneha