C++ Institute Exam CPP Topic 2 Question 69 Discussion

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

Question #: 69
Topic #: 2

[All CPP Questions]

What happens when you attempt to compile and run the following code?

#include

using namespace std;

struct Even {

bool operator ()(int a) {

return (a % 2)==0?true:false;

}

};

int main () {

int t[] = {1,2,3,2,3,5,1,2,7,3,2,1,10, 4,4,5};

set s(t,t+15);

int number = count_if(s.begin(), s.end(), Even());

cout<< number<

return 0;

}

Program outputs:

Ecompilation error

Show Suggested Answer

Suggested Answer: C

by Skye at Jul 24, 2023, 07:08 AM

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Kaitlyn

8 days ago

Wait, wait, wait. Didn't we learn that count_if() counts the number of elements for which the predicate is true? So the answer should be B) 3. I hope I'm not missing something obvious here.

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Annice

9 days ago

Ah, I see what's going on here. The set is created with 15 elements, but we're only checking the first 7. So the answer must be D) 8. Easy peasy!

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Rashida

10 days ago

Hmm, this looks like a tricky one. Let's see, we're using a custom 'Even' functor to count the even numbers in a set. I'm guessing the answer is C) 7, since the set contains 7 even numbers.

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