Nova Hager

        // Declare Scanner
        Scanner input = new Scanner(System.in);

        // Declare variables for simple calculations
        int firstNumber, secondNumber;
        String operation;

        System.out.print("Enter the first integer: ");
        firstNumber = input.nextInt();

        System.out.print("Enter the second integer: ");
        secondNumber = input.nextInt();

        System.out.print("Enter the operation: ");
        operation = input.next();

        // Close input for leaking memory
        input.close();

        // Find operation to calculate numbers
        switch(operation){

            case "+":

                System.out.printf("\n%d + %d = %d", firstNumber, secondNumber, addition(firstNumber, secondNumber));
            break;

            case "-":

                System.out.printf("\n%d - %d = %d", firstNumber, secondNumber, subtraction(firstNumber, secondNumber));
            break;

            case "*":

                System.out.printf("\n%d * %d = %d", firstNumber, secondNumber, multiplication(firstNumber, secondNumber));
            break;

            case "/":

                System.out.printf("\n%d / %d = %d", firstNumber, secondNumber, division(firstNumber, secondNumber));
            break;

            case "%":

                System.out.printf("\n%d mod %d = %d", firstNumber, secondNumber, modules(firstNumber, secondNumber));
            break;

            case "|":

                System.out.printf("\n%d | %d = %d", firstNumber, secondNumber, bitwise(firstNumber, secondNumber));
            break;

            default:

                System.out.print("\nError: Unknow operation!");
            break;
        }
    }

    // Method for addition
    private static int addition(int firstNumber, int secondNumber) {

        return firstNumber + secondNumber;
    }

    // Method for subtraction
    private static int subtraction(int firstNumber, int secondNumber) {

        return firstNumber + secondNumber;
    }

    // Method for multiplication
    private static int multiplication(int firstNumber, int secondNumber) {

        return firstNumber * secondNumber;
    }

    // Method for division
    private static int division(int firstNumber, int secondNumber) {

        return firstNumber / secondNumber;
    }

    // Method for modules
    private static int modules(int firstNumber, int secondNumber) {

        return firstNumber % secondNumber;
    }

    // Method for bitwise
    private static int bitwise(int firstNumber, int secondNumber) {

        return firstNumber | secondNumber;
    }