System.in which represents STDIN, the InputStreamReaderĪnd the BufferedReader classes to read from the input channel. The interesting difference here is the use of This code is an example with the basic maths - I wanted to do with the basics first, and then add the other functions using methods. variables and fields should begin lower-case, closing braces should be placed on their own line. First some formal aspects: Read and follow the Java code conventions: e.g. Let me suggest some improvements for the next program version. We ask the user to type the values in during the execution of the program.īufferedReader br = new BufferedReader(new InputStreamReader(System.in)) I have to make the calculator with the possibilities to do the simple maths (+-) and some other not so basic operations (log, sin, tan, exponential). 1 Answer Sorted by: 0 You created a working calculator. In this alternative soluton, instead expecting the operands and the operator on the command line, Throw new (".") will raise an exception in case the user supplied an operator we don't handle. If has its condition in parentheses and the code in curly braces.Įlse if allows us to attach more, alternative conditions. String is used to declare a variable as string. grade-calculator Here are 15 public repositories matching this topic. 1 I have designed a simple console calculator as follows but i need to create a loop where I can re run the program: So that I won't need to run the program again and again and it can take the input from the user and run by itself. Int is used to decalare a variable as integer. Calculator in Java with Source Code, see the example of calculator in java, Swing Tutorial with example of JButton, JRadioButton, JTextField, JTextArea. Integer.parseInt can convert a string into an integer number. The args array will hold the values passed on the commad line. The OpenCSV library is used to read CSV data. Im trying to make a simple calculator using scanner and inheritance too, after i insert two numbers and operator i found this Exception the Exception is : Exception in thread 'main' java.util. The example uses Apache Commons libraries to parse command line arguments, do math, and transform data. Is also 7 as Java will only keep the integer part of the division. The following example creates a Java console application which reads data from a CSV file and computes some basic statistics. For this we need to but it in quotes:įinally we also have to accept that the division as it is in this code will work as an integer division. In order to avoid this we need to tell the shell to pass the * as it is. The program takes the value of both the numbers (entered by user) and then user is asked to enter the operation (+, -, and /), based on the input. In this Program we are making a simple calculator that performs addition, subtraction, multiplication and division based on the user input. So, in your symbols button press event, store the symbol text in a variable, then, in the button press event, check to see which symbol is in the variable and act accordingly. You could do this with an if/else if/else chain. This problem is caused by the shell interfering with our businees. Java Program to Make a Calculator using Switch Case. Then, when the equals button is pressed, you have to check to see which operator you stored. To parse the string "ArgsCalculator.java" into an integer. That in turn will trigger an exception on our code as it tries Java ArgsCalculator 7 ArgsCalculator.java ArgsCalculator.class HelloWorld.java 3Īssuming we have those 3 files in the current directory. So the shell will actually call something like this: That's because the * on the command line is interpreted by the shell as a wide-card character and it is replaced by the names of all the files in the current directory. If we would like to multiply numbers we have to be careful.Įxception in thread "main" : For input string: "ArgsCalculator.java"Īt (NumberFormatException.java:65)Īt (Integer.java:580)Īt (Integer.java:615)Īt ArgsCalculator.main(ArgsCalculator.java:6) This includes Windows Forms applications, Windows Presentation Foundation applications, console applications, and class libraries. Will compile the Java clode and create a file called ArgsCalculator.class The total tax varies with the slab as per the given table.In this solution we receive the 2 numbers and the operator on the command line. All incomes above 300,000 are subjected to a total of 2 % Education plus 1% Higher Education Cess on the total tax.
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