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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Cyril

22 hours 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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Carissa

13 days 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

14 days ago

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

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Van

15 days ago

I think line I is not a valid instantiation.

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Maynard

16 days 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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Carmela

16 days 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

17 days ago

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

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Mabel

18 days 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

18 days ago

I think line I is not a valid instantiation.

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