public class MethodMaze {

    public static int a(int number) {

        return number * 2;

    }

    public static int b(int number) {

        return c(number + 5);

    }

    public static int c(int number) {

        if (number % 2 == 0) {

            return b(number);

        } else {

            return d(number);

        }

    }

    public static int d(int number) {

        int sum = number + 15;

        return sum * 3;

    }

    public static void main(String[] args) {

        int x = 2;

        System.out.println(c(a(x)));

    }

}

1) List the function/method names in the order in which the computer executes the functions/methods.

2) What is the output when MethodMaze is compiled and executed with the initial value of x set to 2?

Question

public class MethodMaze {

public static int a(int number) {

return number * 2;

}

public static int b(int number) {

return c(number + 5);

}

public static int c(int number) {

if (number % 2 == 0) {

return b(number);

} else {

return d(number);

}

public static int d(int number) {

int sum = number + 15;

return sum * 3;

}

public static void main(String[] args) {

int x = 2;

System.out.println(c(a(x)));

}

1) List the function/method names in the order in which the computer executes the functions/methods.

2) What is the output when MethodMaze is compiled and executed with the initial value of x set to 2?

BlackTom AI · Accepted Answer

To evaluate these options, I will trace the actual runtime flow of the program step by step, noting both the order of method calls and the resulting output.
Option 1: 'main, a, b, c, d 2). 72'
- Why this is not correct: The call sequence is not consistent with how the code invokes methods. After main calls c(a(x)), the evaluation first executes a(x) to produce the argument for c, so 'b' cannot come before the early 'c' that processes the result of a(x). The presence of 'b' before the second 'c' indicates an incorrect call order. As for the output, 72 is the correct final value, but the stated sequence shows a fundamental misordering, so this option is flawed overall.
Option 2: 'main, a, c, b, d, c 2). 54'
- Why this is not correct: The sequence itself misorders the calls inside the inner chain. After calling b(4), the next step must be a call to c(9) (because b returns c(number+5)). It is not correct to have a separate 'd' before the final 'c' in that branch. Additionally, the claimed output 54 does not match the actual computation (which yields 72). The combination of an impossible call order and an incorrect numeric result makes this option invalid.
Option 3: 'main, a, c, b, c, d 2). 62'
- Why this is not correct: The sequence 'main, a, c, b, c, d' correctly reflects the nested calls (a -> then c -> inside c with 4, b -> inside b calls c(9) -> inside that c with 9 calls d). However, the numeric output is stated as 62, which is inconsistent with the actual arithmetic: d(9) computes (9 + 15) * 3 = 72, so the final printed value is 72, not 62. This makes the option partially correct in flow but wrong in result.
Option 4: 'main, a, c, b, c, d 2). 72'
- Why this is correct: This option presents the exact call order the program follows: main starts, then a(x) is evaluated, then c(4) is called; inside that, since 4 is even, b(4) is invoked; b(4) calls c(9); c(9) detects an odd number and calls d(9); d(9) computes (9 + 15) * 3 = 72, which propagates back up to produce the final printed value 72. The sequence and the numeric result are both consistent with the code.
Option 5: 'main, c, a, b, c, d 2). 62'
- Why this is not correct: The very first call after starting the program is to main, which then calls c(a(x)). It is impossible for the first subsequent call to be 'c' before 'a' because 'c' receives the result of a(x). Therefore this option misorders the initial steps, and the final number 62 is also incorrect for the same arithmetic reasons noted above.

01:198:111:01 INTRO COMPUTER SCI Functions Post Recitation Quiz

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