Difference between revisions of "Java/C2/Arithmetic-Operations/English-timed"
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Revision as of 14:30, 9 July 2014
| Time | Narration |
| 00:01 | Welcome to the tutorial on Arithmetic Operations in Java. |
| 00:05 | In this tutorial, you will learn about the various Arithmetic Operations namely
Addition Subtraction Multiplication Division and How to use them. |
| 00:16 | For this tutorial we are using
Ubuntu 11.10, JDK 1.6 and Eclipse 3.7. |
| 00:24 | To follow this tutorial you must have eclipse installed on your system |
| 00:28 | and you must know how to create, save and run a file in Eclipse.
|
| 00:32 | If not, for relevant tutorial please visit our website as shown. |
| 00:42 | Here is a list of operators and the mathematical operations they perform
|
| 00:54 | We shall look at each of them in detail. |
| 01:05 | Here We have Eclipse IDE and the skeleton required for the rest of the code.
|
| 01:10 | We have created a class by name Arithmetic Operations and added the main method.
|
| 01:17 | Let us add some variables. |
| 01:22 | int x = 5; |
| 01:26 | 'int y = 10;
int result
|
| 01:35 | x and y will be the operands and the result will store the output of operations. |
| 01:41 | Let us add them and print the result. Result= x+y; system. out. println 'in parantesis result |
| 02:10 | Save it with Control S and control F11 to Run |
| 02:17 | We see, that the output of addition has been stored in result and the value has been printed |
| 02:24 | Now Let us change the values . x=75,y = 15 |
| 02:37 | Save it Run |
| 02:42 | we see that the output has changed accordingly |
| 02:48 | Now let us try negative values. 'y = -25. |
| 02:57 | Save Run. |
| 03:02 | we see that the output of 75 plus -25 has been printed |
| 03:10 | Now let us try subtraction. 'y = 5 and change x+y to x-y |
| 03:25 | Save it Run. |
| 03:32 | we see that the output of 75-5 has been printed, |
| 03:38 | Now Let us try multiplication. Change minus to asterisk |
| 03:46 | Save and Run. |
| 03:52 | we see that by using asterisk we could multiply 75 by 5. . |
| 03:58 | Now let us try division Remove asterisk and type slash |
| 04:07 | Save it Run. |
| 04:13 | As we can see, the output is as expected. |
| 04:18 | Now let us see what happens when the expected result is a decimal point number. |
| 04:24 | Change 5 to 10 |
| 04:28 | The result must be 7.5. |
| 04:30 | So let us change the result to a float. |
| 04:43 | Save it Run. |
| 04:50 | Note that although the expected result is 7.5, we get output as 7.0 |
| 04:57 | This is because both the operands involved in the division are integers. |
| 05:01 | Let us change y to a float. y=10f |
| 05:15 | Save Run. |
| 05:21 | Now we can see that the result is as expected.
|
| 05:24 | Keep in mind that when the expected result is a float, one of the operands must be a float to get the expected output. |
| 05:32 | Now let us see what happens when there is more than one operator.Remove all the operands |
| 05:48 | int result= 8+4-2. Save it ,run |
| 06:09 | As we can see, the output is as expected. |
| 06:12 | Now Change minus to a slash
|
| 06:19 | Now the output would be 6 if the addition is done before division.
|
| 06:25 | Or it would be 10 if division is done before addition.
|
| 06:30 | Let us Run and see the output.
|
| 06:38 | As we can see, the output is 10 and the division is done before addition. This is because the division operator has more precedence than the addition operator.
|
| 06:50 | In such situations, if we need to override the precedence, we use parentheses. |
| 07:04 | By adding parentheses, we instruct Java to do the addition before the division.
|
| 07:10 | Let us run the file now.
|
| 07:15 | As we can see, addition has been performed first and the output is 6 as expected.
|
| 07:22 | As a rule, keep in mind to use parentheses when the order of operations is not clear. |
| 07:36 | This brings us to the end of this tutorial. |
| 07:40 | we have learnt |
| 07:41 | How to perform basic mathematical operations in Java. |
| 07:44 | operator precedence, and, |
| 07:45 | How to override it. |
| 07:49 | As an assignment for this tutorial Find out what is meant by the modulo operator and what it does. |
| 07:57 | To know more about the Spoken Tutorial project, watch the video available at the following link, |
| 08:02 | It summarizes the project. |
| 08:05 | If you do not have good bandwidth you can download and watch it |
| 08:10 | The Spoken Tutorial Team. |
| 08:12 | Conducts workshops using spoken tutorials |
| 08:14 | Gives certificates to those who pass an online test. |
| 08:18 | For more details, please write to spoken HYPHEN tutorial DOT org. |
| 08:24 | The Spoken Tutorial Project is a part of the Talk to a Teacher project . |
| 08:29 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. |
| 08:35 | More information on this Mission is available at the following link spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro |
| 08:39 | This tutorial has been contributed by TalentSprint. Thanks for joining.
|
Contributors and Content Editors
Arya Ratish, Gaurav, Krupali, PoojaMoolya, Priyacst, Sandhya.np14, Sneha
