Answers for popcorn hack

(6 * 3) + 4
(10 + (2 * 8)) - 3
(15/3) + (2 * 4)
(7 + (3 * 2)) - 5
(9 + 3) ^ 2

HW Code Below

import java.util.Stack;


    // Function to evaluate a prefix expression
    public static double evaluatePrefix(String expression) {
        Stack<Double> stack = new Stack<>();
        String[] tokens = expression.split(" ");

        // Start from the right side of the expression
        for (int i = tokens.length - 1; i >= 0; i--) {
            String token = tokens[i];

            if (isOperator(token)) {
                // Pop two operands for the operator
                double operand1 = stack.pop();
                double operand2 = stack.pop();
                double result = applyOperator(token, operand1, operand2);
                stack.push(result);
            } else {
                // If it's a number, push it to the stack
                stack.push(Double.parseDouble(token));
            }
        }

        // The final result is at the top of the stack
        return stack.pop();
    }

    // Check if token is an operator
    private static boolean isOperator(String token) {
        return token.equals("+") || token.equals("-") || token.equals("*") || token.equals("/") || token.equals("^");
    }

    // Apply the operator to two operands
    private static double applyOperator(String operator, double a, double b) {
        switch (operator) {
            case "+": return a + b;
            case "-": return a - b;
            case "*": return a * b;
            case "/": return a / b;
            case "^": return Math.pow(a, b);
            default: throw new IllegalArgumentException("Invalid operator: " + operator);
        }
    }


        // Example expressions
        String expression1 = "* + 10 2 8"; // (10 + 2) * 8 = 96
        String expression2 = "- * 7 5 2"; // (7 * 5) - 2 = 33
        String expression3 = "^ + 9 3 2"; // (9 + 3)^2 = 144        < - -- these are the examples i tested

        System.out.println("Result 1: " + evaluatePrefix(expression1));
        System.out.println("Result 2: " + evaluatePrefix(expression2));
        System.out.println("Result 3: " + evaluatePrefix(expression3));

Result 1: 96.0
Result 2: 33.0
Result 3: 144.0