C++ Institute Exam CPP Topic 2 Question 77 Discussion

Actual exam question for C++ Institute's CPP exam

Question #: 77
Topic #: 2

[All CPP Questions]

Which are NOT valid instantiations of priority_queue object:

#include

using namespace std;

int main()

{

deque mydeck;list mylist; vector myvector;

priority_queue first;//line I

priority_queue > second;//line II

priority_queue third(first);//line III

priority_queue > fourth(third);//line IV

priority_queue > fifth(myvector.begin(), myvector.end());//line V

return 0;

}

Aline I

Bline II

Cline III

Dline IV

Eline V

Show Suggested Answer

Suggested Answer: E

by Colette at Jan 27, 2024, 10:52 PM

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Malcom

3 months ago

I'm pretty sure all the other lines are valid instantiations. Line IV is the only one that doesn't work. Now, if they asked me to instantiate a priority_queue with a banana, that would be a different story!

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Shawnda

1 months ago

I agree with you, line IV is the only one that doesn't work. The rest are valid instantiations.

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Mary

1 months ago

No, I'm pretty confident that line II is valid. It's line IV that doesn't work.

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Stephaine

1 months ago

Are you sure about that? I think line II is also not a valid instantiation.

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Timothy

1 months ago

E) line V

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Antonio

1 months ago

D) line IV

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Raina

1 months ago

C) line III

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Margarita

1 months ago

B) line II

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Mattie

2 months ago

A) line I

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Cyril

4 months ago

Haha, it's funny how they try to trick us with a list. Who uses a list for a priority queue? That's like trying to use a toaster to dry your hair!

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Eun

2 months ago

It's like using a toaster to dry your hair, totally useless!

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Lavonne

2 months ago

C) line III

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Paris

3 months ago

I agree, a list is not efficient for a priority queue.

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Irma

3 months ago

Definitely! A priority queue should be implemented with a deque or a vector.

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Buck

3 months ago

Haha, I know right! Using a list for a priority queue is a bad idea.

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Pamela

3 months ago

B) line II

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Lyda

3 months ago

A) line I

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Carissa

4 months ago

I believe line V is also not valid because it is trying to initialize a priority_queue with iterators from a vector.

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Lauran

4 months ago

I agree with Van, line I is incorrect because it is missing the container type.

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Van

4 months ago

I think line I is not a valid instantiation.

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Maynard

4 months ago

I agree with Mabel. The list is not a valid container for a priority_queue, so line IV is not a valid instantiation.

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Cecily

3 months ago

That makes sense. Thanks for clarifying!

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Sherrell

3 months ago

So, the correct answer would be D) line IV.

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Beckie

4 months ago

Yes, I agree. The correct containers for priority_queue are deque and vector.

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Marget

4 months ago

I think line IV is not valid because list is not a valid container for priority_queue.

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Carmela

4 months ago

I believe line V is also not valid because it is trying to initialize a priority_queue with iterators from a vector.

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Darrin

4 months ago

I agree with Willetta, line I is incorrect because it is missing the container type.

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Mabel

4 months ago

The correct answer is line IV. A priority_queue can only be instantiated with a deque or a vector as the underlying container, not a list.

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Willetta

4 months ago

I think line I is not a valid instantiation.

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