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C++ Institute CPP Exam - Topic 2 Question 113 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 113
Topic #: 2
[All CPP Questions]

Which changes introduced independently will allow code to compile and display 0 1 8 9 (choose all that apply)

#include

#include

#include

using namespace std;

class A {

int a;

public:

A(int a):a(a){}

int getA() const { return a;}

/* Insert Code Here 1 */

};

/* Insert Code Here 2 */

int main(){

A t[] ={ 3, 4, 2, 1, 6, 5, 7, 9, 8, 0 };

vectorv(t, t+10);

set s1(v.begin(),v.end());

s1.insert(v.begin(),v.end());

s1.erase(s1.lower_bound(2),s1.upper_bound(7));

for(set::iterator i=s1.begin();i!= s1.end(); i++) {

cout<getA()<<" ";

}

cout<

return 0;

}

Show Suggested Answer Hide Answer
Suggested Answer: A, B, D

by Joseph at Aug 14, 2025, 06:18 AM

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Keneth
2 months ago
I agree, D is essential for the set to work properly.
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Ruth
2 months ago
Wait, why do we need D? That seems odd.
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Vivan
2 months ago
C seems wrong, it flips the comparison.
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Rebeca
2 months ago
I think B is the right choice too!
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Corrinne
3 months ago
A is definitely needed for the output.
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Louann
3 months ago
I believe option D is also important because it defines the comparison for the set, but I can't recall if it needs to be at Place 2 specifically.
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Karon
4 months ago
I'm a bit confused about option C. It seems like it could work, but I feel like it might not give the correct order for the set.
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Gerald
4 months ago
I remember practicing a similar question where we had to define comparison operators for a custom class. I think option B is definitely correct.
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Rusty
4 months ago
I think option A is necessary for the code to compile, but I'm not entirely sure if it's the only one needed.
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Teri
4 months ago
I've got a strategy for this. I'll start by looking at the options that involve overloading the `<` operator, since that's what the `set` container uses to sort its elements. Then I'll consider how the different implementations would affect the sorting and insertion of the `A` objects.
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Dante
4 months ago
Okay, let's see. I think the key here is to understand how the `set` container works and what it requires for the elements to be properly sorted. I'll need to carefully evaluate each of the options and how they would impact the comparison and insertion of the `A` objects.
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Anglea
5 months ago
Hmm, I'm a bit confused by this question. I'm not sure which changes would allow the code to compile and display the expected output. I'll need to review the operator overloading concepts and think through how they might affect the set operations.
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Tequila
5 months ago
This question is testing our understanding of operator overloading and how it affects the behavior of the `set` container. I think I need to carefully consider the different options and how they would impact the sorting and insertion of the `A` objects into the `set`.
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Jarvis
5 months ago
I think option B is the correct answer. Defining the less-than operator to compare the 'a' member of the A class will allow the set to properly order the elements.
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Scarlet
2 months ago
I think option A is also needed for proper output.
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Kristofer
2 months ago
But what about option D? It could work too.
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Ernestine
3 months ago
Yeah, without A, it won't compile correctly.
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Ciara
3 months ago
I agree, option B is essential for ordering.
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