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C++ Institute CPP Exam - Topic 8 Question 112 Discussion

What happens when you attempt to compile and run the following code?#include #include #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
C) compilation error
A) 5 6 7 8 9 10
B) 4 5 6 7 8 9 10
D) 1 2 3 4 5
E) 1 2 3 4

C++ Institute CPP Exam - Topic 8 Question 112 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 112
Topic #: 8
[All CPP Questions]

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

#include

#include

#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() {

int t[]={8, 10, 5, 1, 4, 6, 2, 7, 9, 3};

deque d1(t, t+10);

sort(d1.begin(), d1.end());

deque::iterator it = upper_bound(d1.begin(), d1.end(), B(4), greater());

for_each(it, d1.end(), Out(cout)); cout<

return 0;

}

Program outputs:

Show Suggested Answer Hide Answer
Suggested Answer: C

by Gianna at Jul 30, 2025, 12:08 PM

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Leatha
5 months ago
I can't believe it sorts and outputs like that!
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Ahmed
5 months ago
Definitely not a compilation error, it runs smoothly.
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Bettyann
5 months ago
Wait, is there a compilation error?
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Brittni
5 months ago
I think it outputs 5 6 7 8 9 10.
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Lynsey
5 months ago
Looks like it should compile fine.
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Aleisha
6 months ago
I feel like there might be a compilation error because of how the deque is initialized with the array. Wasn't there something tricky about that?
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Latanya
7 months ago
I practiced a similar question, and I think the output should be the values greater than 4, but I can't recall if it includes 4 itself.
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Cyril
7 months ago
I'm not entirely sure, but I remember something about `upper_bound` needing a sorted range. Does the sort function work as expected here?
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Kizzy
7 months ago
I think the code should compile fine since it uses standard libraries and the class is defined correctly.
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Kenny
7 months ago
Ah, I see now. The `greater()` predicate is used to reverse the sorting order, so the `upper_bound` call finds the first element less than or equal to 4. That means the output should be the elements from 4 to 10, which is option B.
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Maryrose
7 months ago
I'm not entirely sure about this one. The use of the `greater()` predicate is throwing me off, and I'm not confident I fully understand how the `upper_bound` function works in this context. I'll need to review the C++ standard library documentation to be sure.
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Hildred
8 months ago
Okay, I think I've got it. The `deque` is initialized with the array `t`, then sorted in ascending order. The `upper_bound` call finds the first element greater than 4, and the `for_each` loop prints those elements. The answer should be B.
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Carissa
8 months ago
Hmm, I'm a bit confused by the `greater()` predicate used in the `upper_bound` call. I'll need to think through how that affects the sorting and search behavior.
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Ettie
8 months ago
This looks like a tricky C++ question involving the use of the `deque` container and the `upper_bound` algorithm. I'll need to carefully read through the code and understand the logic to determine the correct output.
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Georgene
8 months ago
Hmm, I'm not sure about this one. Let me double-check the logic. Oh, I got it! D is the correct answer. Nice try, tricky question!
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Flo
8 months ago
Ha! I bet the compiler will just laugh at this code and throw a tantrum. C is the way to go here.
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Graciela
5 months ago
Definitely a compilation error. No way it runs!
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Melita
6 months ago
I think you're right! That code looks messy.
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Vesta
6 months ago
C is the best choice here. Good call!
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Ashanti
6 months ago
I wouldn't be surprised if it just crashes.
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Dominic
10 months ago
No way, the output has to be B! The code sorts the deque in ascending order, so the output should be the sorted elements.
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Nieves
10 months ago
I think the correct answer is D. The code sorts the deque in ascending order and then uses upper_bound to find the iterator pointing to the first element greater than 4. It then prints the remaining elements in descending order.
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Reena
8 months ago
No, it actually prints the elements in ascending order after sorting.
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Tracey
8 months ago
I think the correct answer is D.
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Ivory
10 months ago
I'm not sure, but I think it might be C) compilation error.
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Ahmed
10 months ago
I agree with Amalia, the code sorts the deque in ascending order.
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Amalia
10 months ago
I think the answer is B) 1 2 3 4 5 6 7 8 9 10.
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