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Adding a log function to the java calculator program

By : Joe Fox
Date : October 18 2020, 06:10 PM
around this issue You may add another condition to check at any point in this control structure.
For example, assuming that you are wanting to add a logarithmic function to your program, and assuming the method signature of that function contains log(double value, double base), you could add the statements...
code :
else if (op == "log") {
    log(x, y);
public void OperatorIndicator(double x, double y, String op){
    if (op.equals("+")) {
        multiply(x, y);
    } else if (op.equals("/")) { 
        divide(x, y); 
    } else if (op.equals("+")) {
        sum(x, y);
    } else if (op.equals("-")) {
        difference(x, y);
    } else if (op.equals("")){
        if (y == 0) {
        } else {
    } else {
        System.out.println("OPERATOR NOT VALID");

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Java Calculator Program

By : Charlie
Date : March 29 2020, 07:55 AM
Hope this helps Rather than using an array, you know that you will have a series of operations of a known type followed by numbers of a known type. So you really want to tokenise it into your own structure that can be created from an operation name and a quantity and then knows how to perform that operation and also how to describe it. Then you can create a file parser which reads each row and returns an operation object relevant to it. You probably use an interface for that, so that your IMathmaticalOperation would have a name, symbol, number, and performOperation( number ) members and then you could have AdditionOperation, SubtractionOperation and so on that implement it and know how to perform their own operations. This also means if you decided to add new functions to your calculator it would be easy to create new objects implementing that interface without having to change your core code too much. Your file parser can then return an array of IMathmaticalOperations and doesn't have to know the details of how they actually do things, just that they implement the operations correctly.
It also makes it easy to unit test. It sounds like you're just starting out, so learning how to do unit testing now will get you on a good path for the rest of your programming life.

Writing Calculator class into a "Command Line Calculator" program (Java)

By : Martin Hubáček
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Here is the relevant part of the main program from the assignment: , Here are some pointers:
code :
Calculathor counter = new Calculathor();
Calculator counter = new Calculator();
for(String arg: args){
for(int i = 0; i < args.length; i++) {

Simple calculator program in Java

By : Duver
Date : March 29 2020, 07:55 AM
seems to work fine Add Calc.nextLine(); after n2 = Calc.nextInt(); to consume the line feed.
You are also not using else if so all those if conditions will be checked even if previous if already matched (resulting in your final else being executed as long as operator not '/').

Average Calculator Program Using Java

By : depaysement
Date : March 29 2020, 07:55 AM
may help you . Your code is almost there, just missing to store the values entered by user :
code :
System.out.println("Enter the marks : ");   
for (int i =0; i < mark.length; i ++) {     
    System.out.printf("Enter integer mark %s between 0 and 100: ", i + 1);
    // assign each input to an index of the array
    mark[i] = input.nextInt();
int mark[] = new int[4];

Calculator program in java

By : Abdrahim Bissoulah
Date : March 29 2020, 07:55 AM
Hope that helps I'm not going to go into the code you have posted in your questions, but rather attempt to help you attack your overall goal of writing a calculator demo.
The first step should be to get a clear idea of the problem by writing it down:
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