Java/C2/Numerical-Datatypes/English-timed

Time	Narration
00:01	Welcome to the spoken tutorial on Numerical Data types in Java.
00:07	In this tutorial, we will learn about:
00:10	The various Numerical Data types 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.
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 tutorials, 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 (-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 might give a 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 data types
07:44	and how to store 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.
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Contributors and Content Editors

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