C++ Institute CPP Exam - Topic 9 Question 109 Discussion

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

Question #: 109
Topic #: 9

[All CPP Questions]

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

#include

using namespace std;

class B { int val;

public:

B(int v):val(v){}

int getV() const {return val;} bool operator < (const B & v) const { return val

ostream & operator <<(ostream & out, const B & v) { out<

templatestruct Out {

ostream & out;

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

void operator() (const T & val ) { out<

int main() {

B t1[]={3,2,4,1,5};

B t2[]={5,6,8,2,1};

vector v1(10,0);

sort(t1, t1+5);

sort(t2, t2+5);

set_symmetric_difference(t2,t2+5,t1,t1+5,v1.begin());

for_each(v1.begin(), v1.end(), Out(cout));cout<

return 0;

}

Program outputs:

A6 8 3 4 0 0 0 0 0 0

B3 4 0 0 0 0 0 0 0 0

C6 8 0 0 0 0 0 0 0 0

Dcompilation error

E3 4 6 8 0 0 0 0 0 0

Show Suggested Answer Hide Answer

Suggested Answer: E

by Camellia at Jun 13, 2025, 01:13 AM

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Jordan
2 months ago

Wait, why are there so many zeros in the output?

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Kallie
2 months ago

I think the output should be 6 8 0 0 0 0 0 0 0 0.

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Steffanie
2 months ago

The code compiles fine, no errors.

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Alethea
3 months ago

Definitely not a compilation error, so D is wrong.

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Dion
3 months ago

I disagree, the output is definitely not what option E suggests.

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Krystal
3 months ago

I'm leaning towards option C because it seems like the unique elements from t2 would be printed, but I'm not completely confident.

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Latanya
3 months ago

I practiced a similar question where sorting was involved, and I feel like the output might be related to the sorted values of t1 and t2.

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Lai
4 months ago

I remember something about `set_symmetric_difference`, but I can't recall if it will actually work with the way the vectors are set up.

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Kristel
4 months ago

I think the code should compile fine since all the necessary includes are there, but I'm not sure about the output.

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Douglass
4 months ago

This seems straightforward enough. I'll work through the logic and try to visualize the data structures to arrive at the correct output.

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Matthew
4 months ago

I'm a bit confused by the custom B class and the overloaded operators. I'll need to make sure I understand how those are being used in the code.

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Arminda
4 months ago

Okay, I think I've got this. The key is understanding how the sort and set_symmetric_difference functions are being used on the two arrays of B objects.

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Tawny
5 months ago

Hmm, the use of set_symmetric_difference is interesting. I'll need to review how that algorithm works to determine the expected output.

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Kathrine
5 months ago

This looks like a tricky one. I'll need to carefully go through the code step-by-step to understand what's happening.

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Shay
8 months ago

Whoa, they're playing around with all sorts of fancy C++ stuff here. I bet the output is gonna be a total surprise, like finding a unicorn in your cereal bowl.

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Dierdre
7 months ago

I'm not sure, but I think it might be option C) compilation error

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Dierdre
7 months ago

No way, I believe it will be option B) 1 2 3 4 5 6 7 8 9 10

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Dortha
7 months ago

C) compilation error

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Dortha
7 months ago

C) compilation error

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Dierdre
8 months ago

I think the output will be option A) 8 10 5 1 4 6 2 7 9 3

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Kristofer
8 months ago

Hmm, you might be right. Let's see what others think about this question.

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Joesph
8 months ago

I disagree, I believe the answer is B because set_symmetric_difference will give the symmetric difference between the two ranges.

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Kristofer
8 months ago

I think the answer is A because set_symmetric_difference will give the elements that are in one of the ranges but not in both.

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Bonita
8 months ago

Wait, did they just try to use a vector with a custom class? Sounds like a recipe for a good ol' fashioned compilation error to me.

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Denise
8 months ago

Oh man, this code looks like a real head-scratcher! I bet the compiler is gonna choke on it like a cat with a hairball.

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Ressie
7 months ago

Yeah, the code seems to be missing the necessary include for set_symmetric_difference.

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Ressie
7 months ago

I think the issue might be with the set_symmetric_difference function.

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Ressie
7 months ago

It will output: C) compilation error

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