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C++ Institute CPP Exam - Topic 1 Question 61 Discussion

What happens when you attempt to compile and run the following code?#include #include #include using namespace std;templatestruct Out {ostream & out;Out(ostream & o): out(o){}void operator()(const T & val ) {out
C) 30 0 0 0 0 0 0 0 20 10
A) 20 30 10 20 30 10 20 30 10 20
B) 30 20 10 0 0 0 0 0 0 0
D) compilation error

C++ Institute CPP Exam - Topic 1 Question 61 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 61
Topic #: 1
[All CPP Questions]

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

#include

#include

#include

using namespace std;

templatestruct Out {

ostream & out;

Out(ostream & o): out(o){}

void operator()(const T & val ) {

out<

}

};

struct Sequence {

int start;

Sequence(int start):start(start){}

int operator()() { return 10*(1+(start++ %3)); } };

int main() {

vector v1(10);

vector v2(10);

generate(v1.begin(), v1.end(), Sequence(1));

sort(v1.rbegin(), v1.rend());

unique_copy(v1.begin(),v1.end(), v2.begin());

for_each(v2.begin(), v2.end(), Out(cout) );cout<

return 0;

}

Program outputs:

Show Suggested Answer Hide Answer
Suggested Answer: C

by Caprice at Jan 05, 2023, 08:33 AM

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Bernadine
10 months ago
I’m surprised it doesn’t throw an error with all those operations!
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Janella
10 months ago
Definitely not a compilation error, so D is wrong.
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Tyra
10 months ago
Wait, why are there so many zeros? That seems off.
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Brendan
10 months ago
I think it should be option B too!
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Timothy
11 months ago
Looks like it outputs 30 20 10 0 0 0 0 0 0 0.
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Katina
11 months ago
I wonder if there's a compilation error because of the way `Sequence` is defined. It seems like it could cause issues.
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Jody
11 months ago
I feel like the output might be option A, but I'm a bit confused about how `unique_copy` works in this context.
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Nada
11 months ago
I remember practicing something similar with `generate` and `sort`, but I can't recall what `unique_copy` does exactly.
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Kattie
11 months ago
I think the code should compile fine since it uses standard library features correctly, but I'm not sure about the output.
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Eliseo
11 months ago
I think I know the answer to this one. Employee discounts are a common type of voluntary financial benefit, so I'm going to go with option C.
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Lewis
11 months ago
Hmm, I'm a bit unsure about this one. The options seem to cover different aspects of tools, but I'm not sure which one is the specific requirement from the ISO standard. I'll need to re-read the question carefully.
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Larue
11 months ago
I remember we discussed CloudWatch Logs Insights being pretty good for analyzing logs quickly. Is that an option here?
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Odette
11 months ago
I think the key here is to configure named locations with a public IP address range, since the question specifies the Boston office and the solution must meet the authentication and access requirements.
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Giuseppe
1 year ago
This question is a real brainteaser! I bet the compiler will throw an error because the Sequence struct is not copyable. That would be hilarious! Anyway, I'm going with E) compilation error.
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Dannette
1 year ago
Let's see if the code throws a compilation error or not.
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Trinidad
1 year ago
I agree with Angelyn, I also think there will be a compilation error.
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Angelyn
1 year ago
I believe there will be a compilation error due to the Sequence struct not being copyable.
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Dannette
1 year ago
I think the code will compile without errors.
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Gwenn
1 year ago
Let's see what happens when we actually compile and run the code.
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Gwenn
1 year ago
I agree, I also think there might be a compilation error.
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Gwenn
1 year ago
I believe there might be a compilation error due to the Sequence struct not being copyable.
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Gwenn
1 year ago
I think the code will compile without any errors.
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Lorriane
1 year ago
Hmm, I'm not sure about this one. Let me think it through... Ah, I got it! The correct answer must be D) 11 10 9 8 7 6 5 4 3 2. The Sequence struct generates a sequence of 10 numbers, but the sort function reverses the order, and the unique_copy() function removes the duplicates.
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Tori
1 year ago
I'm pretty sure the answer is A) 1 2 3 4 5 6 7 8 9 10. The Sequence struct generates a sequence of 10 numbers, and the unique_copy() function simply copies the unique elements to the second vector.
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Celestina
1 year ago
Yes, the code generates a sequence and then copies the unique elements to the second vector, resulting in A) 1 2 3 4 5 6 7 8 9 10.
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Celestina
1 year ago
I think you're correct, it should be A) 1 2 3 4 5 6 7 8 9 10.
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Izetta
1 year ago
But the code sorts the vector in descending order, so the answer should be C.
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Paris
1 year ago
I disagree, I believe the answer is B.
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Izetta
1 year ago
I think the answer is A.
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Arletta
1 year ago
I think the output will be B) 2 3 4 5 6 7 8 9 10 11. The Sequence struct generates numbers in the range of 10 to 30, and the sort function reverses the order.
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Lelia
1 year ago
That makes sense. The unique_copy function then copies the unique elements to the second vector.
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Lelia
1 year ago
Oh, I see. The sort function only reverses the order, it doesn't change the values.
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Lelia
1 year ago
No, the correct output is A) 1 2 3 4 5 6 7 8 9 10.
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Lelia
1 year ago
I think the output will be B) 2 3 4 5 6 7 8 9 10 11.
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Clay
1 year ago
The output should be C) 10 9 8 7 6 5 4 3 2 1. The code generates a sequence of 10 numbers starting from 1 and incrementing by 3, then sorts the vector in reverse order, and finally removes the duplicates using unique_copy().
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