Java program to design a calculator

This calculator would be able to add, subtract, multiply and divide two numbers. To understand this example, you should have the knowledge of the following Java programming topics:. Here, we have used the Scanner class to take 3 inputs from the user. These statements compute the product of two numbers and print the output.

Finally, the break statement ends the switch statement. Course Index Explore Programiz. Java for Loop. Arrays in Java. Interfaces in Java. JPanel; importjavax. JTextField; importjavax.

Java Calculator is used to calculating operations like addition, subtraction, division, multiplication, modulus, and power. This calculator in Java can be done in 2 ways by using a switch case statement and by using swing API. This is a guide to Calculator in Java. You can also go through our other suggested articles to learn more —. Start off by declaring a public Calculator class and then inside of it, a main method, exactly like shown in the picture.

In Java, a class is simply an object which holds information. In our case, the object we're building is a calculator so we have named it as such. A method is a process which performs a certain task. All methods follow the IPO structure as we will learn later. Brackets in java denote what is contained in what. In our example, our calculator object contains the method we are going to build.

The brackets of the method is where our code is going to be contained. As mentioned in the last step, all methods follow the IPO structure, short for input, process, output structure. This means that in short all methods receive some form of input, perform a process, and return an output.

First we're going to declare the inputs. Inputs can be of different data types so we have to be specific in our declaration.

The main data types are int i. For our example we need to declare two int type numbers and a char type operator which will signify the operation we want to perform. Also one thing we must note are the use of semi-colons. In coding these serve almost as periods and signify breaks in line for the computer reading the code.

Now we begin the process portion of the method. The first thing we must build is a method for the user to enter whatever type of input we like. We can achieve this with the use of a scanner which stores any data the user types in an assigns it to the inputs we declared previously. You can find top downloaded Java project source codes. Note that select Java as the programming language. In this java tutorial we will learn how to create a Java scientific calculator using basic java which helps in to perform operations like Factorial Square Rootlogarithm Factorial etc.

This is a fully scientific calculator made by Java programming language and Swing programming concept. A program that demonstrates this is given as follows Example.

The main function act as a menu for the calculator program. Lets see the code of creating calculator in java. Runs on any computer with Java 6 or higher installed. Save this file as MyCalculatorjava to compile it use javac MyCalculatorjava to use the calcuator do this java MyCalculator. In addition to basic arithmetic functions it provides trigonometric functions logarithms powers roots etc.

Complete ready made projects developed in Java with source code download. Scientific calculator using even-driven programming paradigm of Java. Its a calculator with the following functions. To design a calculator using event driven programming paradigm of Java with the following options Decimal Manipulations Scientific Manipulations Procedure. There are some features of the Java Scientific Calculator The following java scientific calculator will able to perform the following task.

Calculator in Java with Source Code.