From Script | Spoken-Tutorial
Jump to: navigation, search
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




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

plus (+) symbol for addition minus (-) for subtraction asterisk (*) for multiplication and slash (/) for division

00:54 We shall look at each of them in detail.
01:05 Here we have the 'Eclipse IDE' and the skeleton required for the rest of the code.
01:10 We have created a class by name ArithmeticOperations 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 parentheses 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