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

What happens when you attempt to compile and run the following code?#include #include #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
C) 7
A) 4
B) 3
D) 8
E) compilation error

C++ Institute CPP Exam - 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

#include

#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:

Show Suggested Answer Hide Answer
Suggested Answer: C

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

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Gregoria
6 months ago
Definitely not a compilation error, that's for sure.
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Dana
7 months ago
I thought it would count all numbers, not just evens.
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Kattie
7 months ago
Wait, why would it be 8? That seems off.
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Dean
7 months ago
I think the output should be 4.
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Tarra
7 months ago
The set will only contain unique values.
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Jarvis
7 months ago
I feel like the answer could be 4, but I’m not completely confident about how the set will change the count.
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Page
8 months ago
I practiced a similar question with `count_if`, but I can't recall how many even numbers were in that example.
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Kirk
8 months ago
I remember something about sets only storing unique values, so maybe that affects the count of even numbers.
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Queenie
8 months ago
I think the code should compile fine since it uses standard libraries correctly, but I'm not sure about the output.
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Glenn
8 months 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.
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Leonor
8 months 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.
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Tonette
8 months 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.
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Janessa
8 months 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.
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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.
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Galen
12 months ago
I'm leaning towards C) 7 as the output.
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Carlee
12 months ago
I believe the correct output is B) 3.
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Sanda
1 year ago
I think it will output A) 4.
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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!
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Carry
1 year ago
So the count_if function will return the number of even elements, which is 4.
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Fabiola
1 year ago
Yes, you're right. The duplicates will be ignored in the set.
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Aileen
1 year ago
I think the answer is A) 4 because the set will only contain unique elements.
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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.
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Laquita
11 months ago
Looks like we're on the same page, the correct answer is indeed B) 3.
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Bettina
11 months ago
So, the code should output 3 as the number of even elements in the set.
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Anthony
12 months ago
Yes, count_if() does count the number of elements for which the predicate is true.
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Paz
12 months ago
I think you're right, the answer should be B) 3.
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Herminia
12 months ago
Exactly, the code is counting the number of even numbers in the set.
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Melynda
1 year ago
So, the output should be 3 because the Even struct checks for even numbers.
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Hyun
1 year ago
Yes, count_if() counts the number of elements for which the predicate is true.
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Evangelina
1 year ago
That's right, count_if() counts the number of elements for which the predicate is true. So the answer is indeed B) 3.
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Ty
1 year ago
I think you're right, the answer should be B) 3.
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Evangelina
1 year ago
Yes, you are correct. The answer is B) 3.
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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!
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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.
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Asha
1 year 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.
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Long
1 year ago
I agree with Buffy, the Even struct checks for even numbers and the set contains 4 even numbers.
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Buffy
1 year ago
I think the answer is A) 4 because the Even struct counts the even numbers in the set.
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