Compound Assignment Operators Practice Test

In the game score code below, how does the use of *= affect the value of score?

public class GameScoreDemo {

    public static void main(String[] args) {

        int score = 10; // starting score

        /* Player collects a coin */

        score += 5; // add 5 points

        // Player hits a trap

        score -= 3; // lose 3 points

        // Player gets a double-score power-up

        score *= 2; // double the score

        // Player shares points across 3 rounds

        score /= 3; // integer division

        System.out.println("Final score: " + score);

    }

}

In the shopping cart code below, how does the use of += affect the value of totalPrice?

public class ShoppingCartDemo {

    public static void main(String[] args) {

        double totalPrice = 20.00; // starting cart total

        /* Add an item price to the cart total */

        totalPrice += 15.50; // add $15.50

        // Apply a $5 coupon discount

        totalPrice -= 5.00; // subtract $5.00

        // Apply 8% tax by multiplying

        totalPrice *= 1.08; // increase by 8%

        // Reduce to 2 decimal places (in cents) using remainder

        totalPrice %= 100.00; // keep within $0-$99.99

        System.out.println("Final total: $" + totalPrice);

    }

}