Java/C2/Arithmetic-Operations/English-timed
From Script | Spoken-Tutorial
Revision as of 18:05, 20 March 2015 by Sandhya.np14 (Talk | contribs)
| 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 Operators 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 tutorials, 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 operands and the result will store the output of the operations. |
| 01:41 | Let us add them and print the result. result= x+y; system. out. println in paranteses result. |
| 02:10 | Save it with Control S and control F11 to Run. |
| 02:17 | We see that the output of the 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 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 could be 6 if the addition is done before division. |
| 06:25 | Or it could be 10 if the 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
