C++ Institute Exam CPA-21-02 Topic 1 Question 12 Discussion

Actual exam question for C++ Institute's CPA-21-02 exam

Question #: 12
Topic #: 1

Which line of code inserted instead of the comment will make the following code run properly without causing memory leaks?

A~Base() ( delete this; }

Bno additional code is needed

C~Base() { delete ptr; delete ptr; }

D~Base() { delete ptr; }

Show Suggested Answer

Suggested Answer: D

by Lavera at Apr 10, 2024, 11:19 AM

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Huey

5 months ago

I think the answer is A because we need to delete 'this' as well to prHueynt memory leaks.

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Norah

6 months ago

But wouldn't deleting the pointer twice cause a double free error?

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Johnetta

6 months ago

I disagree, I believe the answer is C because we need to delete the pointer twice to avoid memory leaks.

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Norah

6 months ago

I think the answer is D because we only need to delete the pointer once to avoid memory leaks.

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Clorinda

7 months ago

I don't think deleting the pointer twice is necessary. It could lead to undefined behavior. So, I still think D) is the correct answer.

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Zachary

7 months ago

But what about option C) ~Base() { delete ptr; delete ptr; }? Wouldn't deleting the pointer twice be more thorough in preventing memory leaks?

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Lashawnda

7 months ago

I also agree with user_1. Deleting the pointer in the destructor is essential to prevent memory leaks.

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Clorinda

7 months ago

I think the correct answer is D) ~Base() { delete ptr; } because we need to delete the pointer to prevent memory leaks.

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Alright, let's break this down. The code is missing the implementation of the Base class destructor, and we need to ensure that the memory allocated for the ptr member is properly released. I think option D is the way to go. Simple and effective!

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Carlee

8 months ago

You know, I'm still a bit confused about the whole pointer thing. Is the ptr variable a member of the Base class? I need to review my C++ fundamentals before this exam.

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Altha

8 months ago

Haha, I bet the exam writers are trying to trick us with those answer choices. C is clearly wrong, since deleting the pointer twice would result in a double-free error. That's a big no-no!

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Daniel

8 months ago

I agree with Marvel, but I'm also curious about option B. Could it be that no additional code is needed if the Base class has a proper default destructor implementation? That would be the simplest solution.

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Myong

7 months ago

I believe option C would cause memory leaks.

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Hana

7 months ago

But option B also seems like a valid choice.

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Lisha

7 months ago

I think option D is correct.

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Marvel

8 months ago

Okay, let's think this through. The code is missing the destructor implementation for the Base class, which could lead to a memory leak. I'm leaning towards option D, since deleting the pointer once should do the trick.

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Gaynell

8 months ago

Whoa, this question is tricky! I'm not sure I even understand the code, let alone the right answer. Memory leaks are such a pain to deal with.

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C++ Institute Exam CPA-21-02 Topic 1 Question 12 Discussion

Contribute your Thoughts:

Huey

Norah

Johnetta

Norah

Clorinda

Zachary

Lashawnda

Clorinda

Lashandra

Carlee

Altha

Daniel

Myong

Hana

Lisha

Marvel

Gaynell