I wrote very simple calculator in Java. What other functionalities can i add and how can i improve this code? Thanks for every idea. Here's my code:

public static void main(String[] args) {

    Scanner scanner = new Scanner(System.in);

    int a, b;
    System.out.print("Enter a value a = ");
    a = scanner.nextInt();
    System.out.print("Enter a value b = ");
    b = scanner.nextInt();

    int operation;
    System.out.println("Operations: \n 1 - Addition \n 2 - Subtraction \n 3 - Multiplication \n 4 - Division");
    System.out.println("Enter an operation = ");

    switch (operation = scanner.nextInt()) {
    case 1:
        System.out.println("Addition result: "   (a   b));
        break;
    case 2:
        System.out.println("Subtraction result: "   (a - b));
        break;
    case 3:
        System.out.println("Multiplication result: "   (a * b));
        break;
    case 4:
        if ((a % b) == 0) {
            System.out.println("Division result: "   ((float) a / (float) b));
        } else {
            System.out.println(
                    "Division result: "   ((float) a / (float) b)   ", The rest of the division: "   (a % b));
        }
        break;
    default:
        System.out.println("This operation doesnt't exist!");
    }
    scanner.close();
}

}

CodePudding user response：

Your code is looking nice but if you have an idea of methods in java , try using them in your code. Also add some trigonometric functions like sin , cos , tan by using Math class in java

CodePudding user response：

Your code is brilliant and neat. Good job. Try adding functions for finding the average of some numbers, square root, cube root. Also if you can add a function to find percentage % then that would be great. :)