Discuss C++ Institute CPP Exam Topic 2 Question 69

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:

Suggested Answer: C

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37 comments · newest first

Gregoria 11 months ago

Definitely not a compilation error, that's for sure.

Dana 11 months ago

I thought it would count all numbers, not just evens.

Kattie 11 months ago

Wait, why would it be 8? That seems off.

Dean 11 months ago

I think the output should be 4.

Tarra 12 months ago

The set will only contain unique values.

Jarvis 12 months ago

I feel like the answer could be 4, but I’m not completely confident about how the set will change the count.

Page 12 months ago

I practiced a similar question with `count_if`, but I can't recall how many even numbers were in that example.

Kirk 1 year ago

I remember something about sets only storing unique values, so maybe that affects the count of even numbers.

Queenie 1 year ago

I think the code should compile fine since it uses standard libraries correctly, but I'm not sure about the output.

Glenn 1 year ago

The Orchestrator sounds like it's responsible for coordinating and managing the different components of a system, so option C seems like the best fit. I'll mark that one down.

Leonor 1 year ago

I'm a bit confused by the wording of the question. I'll need to review the IAS 17 standard to make sure I understand the requirements.

Tonette 1 year ago

Okay, I've got this. Based on my experience, hard disks, PCIe cards, and power supplies are often designed for hot-swap, but the CPU is not. I'll select A, B, and C as my answer.

Janessa 1 year ago

The current disposal price of the old equipment doesn't affect the decision-making process, since that's just the amount you'd get for the old equipment. The other factors like operating costs and new equipment cost are what you'd use to evaluate the replacement decision.

Blair 1 year ago

I'm just gonna go with E) compilation error. Why? Because that's the only answer that doesn't involve any actual coding, and we all know the real answer is whatever the compiler decides it is.

Galen 1 year ago

↳ replying to Blair

I'm leaning towards C) 7 as the output.

Carlee 1 year ago

↳ replying to Blair

I believe the correct output is B) 3.

Sanda 1 year ago

↳ replying to Blair

I think it will output A) 4.

Thad 1 year ago

Aha! I think I've got it. The set will only contain unique elements, so the duplicates will be ignored. That means the answer is A) 4. Nailed it!

Carry 1 year ago

↳ replying to Thad

So the count_if function will return the number of even elements, which is 4.

Fabiola 1 year ago

↳ replying to Thad

Yes, you're right. The duplicates will be ignored in the set.

Aileen 1 year ago

↳ replying to Thad

I think the answer is A) 4 because the set will only contain unique elements.

Kaitlyn 1 year 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.

Laquita 1 year ago

↳ replying to Kaitlyn

Looks like we're on the same page, the correct answer is indeed B) 3.

Bettina 1 year ago

↳ replying to Kaitlyn

So, the code should output 3 as the number of even elements in the set.

Anthony 1 year ago

↳ replying to Kaitlyn

Yes, count_if() does count the number of elements for which the predicate is true.

Paz 1 year ago

↳ replying to Kaitlyn

I think you're right, the answer should be B) 3.

Herminia 1 year ago

↳ replying to Kaitlyn

Exactly, the code is counting the number of even numbers in the set.

Melynda 1 year ago

↳ replying to Kaitlyn

So, the output should be 3 because the Even struct checks for even numbers.

Hyun 1 year ago

↳ replying to Kaitlyn

Yes, count_if() counts the number of elements for which the predicate is true.

Evangelina 1 year ago

↳ replying to Kaitlyn

That's right, count_if() counts the number of elements for which the predicate is true. So the answer is indeed B) 3.

Ty 1 year ago

↳ replying to Kaitlyn

I think you're right, the answer should be B) 3.

Evangelina 1 year ago

↳ replying to Kaitlyn

Yes, you are correct. The answer is B) 3.

Annice 1 year 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!

Rashida 1 year 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.

Asha 2 years ago

I'm not sure, but I think the answer might be B) 3 because the Even struct might count the number 10 as even.

Long 2 years ago

I agree with Buffy, the Even struct checks for even numbers and the set contains 4 even numbers.

Buffy 2 years ago

I think the answer is A) 4 because the Even struct counts the even numbers in the set.

C++ Institute CPP Exam - Topic 2 Question 69 Discussion