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C++ Institute CPA-21-02 Exam - Topic 1 Question 7 Discussion

What happens when you attempt to compile and run the following code?#include #include using namespace std;class A {public:A() { cout
D) It prints: B0 B1
A) It prints: A0 B0 A0 B1 A0 C0 A0 C1
B) It prints: B0 B1 C0 C1
C) It prints: A0 B0 A0 B0 C0

C++ Institute CPA-21-02 Exam - Topic 1 Question 7 Discussion

Actual exam question for C++ Institute's CPA-21-02 exam
Question #: 7
Topic #: 1
[All CPA-21-02 Questions]

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

#include

#include

using namespace std;

class A {

public:

A() { cout << "A0 ";}

A(string s) { cout << "A1";}

};

class B : public A {

public:

B() { cout << "B0 ";}

B(string s) { cout << "B1 ";}

};

class C : private B {

public:

C() { cout << "C0 ";}

C(string s) { cout << "C1 ";}

};

int main () {

B b1;

C c1;

return 0;

}

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Suggested Answer: D

by Raul at Dec 25, 2023, 04:17 AM

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Ahmed
9 months ago
This seems off, I doubt it prints that way.
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Mona
9 months ago
Wait, does it really not call A1 at all?
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Tamesha
9 months ago
Nah, I’m pretty sure it’s just B0 B1.
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Rozella
9 months ago
I think it should be A0 B0 C0 for sure!
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Rhea
9 months ago
It prints: A0 B0 C0
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Muriel
10 months ago
I thought the output would include B1 since there's a string constructor in B, but I guess it only gets called if you create a B with a string?
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Timmy
10 months ago
I practiced a similar question where the base class constructor was called first. I feel like it should print A0 B0 and then C0, but I could be wrong.
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Ronny
10 months ago
I'm not entirely sure, but I remember something about private inheritance affecting how constructors are called. Does that mean C's constructor won't call B's?
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Reuben
10 months ago
I think when you create an object of class B, it should call the constructor of A first, right? So maybe it prints A0 B0?
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William
10 months ago
This is a tricky one. The private inheritance in class C is throwing me off a bit. I'll need to review the rules around constructor calls and inheritance to make sure I understand what's happening here.
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Samira
10 months ago
I'm a bit confused by the private inheritance in class C. Does that affect the constructor calls in some way? I'll have to think through the order of constructor invocations to solve this.
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Alfred
10 months ago
Hmm, this looks like it's testing our understanding of inheritance and constructor calls. I'll need to carefully trace the object creation and constructor invocations to figure out the correct output.
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Mendy
10 months ago
Okay, I think I've got it. Since class B is publicly inherited from A, the B constructors will call the A constructors. And since class C is privately inherited from B, the C constructors will only call the default B constructor. The output should be straightforward to determine.
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Pamella
10 months ago
I feel pretty confident that a Visual Prototype is the way to go here. It would give the customer a clear visual representation of the new online experience, which seems like the most effective way to communicate the changes.
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Isaiah
10 months ago
This seems pretty straightforward. The focus group was used to test the customer experience, so I'd go with option A - Focus group.
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Ammie
11 months ago
Okay, let's see. We need to create three interfaces, so we'll want to use a loop to do that. I'm leaning towards A, 'with_items', since that's the most straightforward way to iterate over a list of interface names.
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Leonida
1 year ago
Ah, the age-old constructor conundrum strikes again! I'm going with C) for this one. After all, who doesn't love a good old-fashioned 'A no parameters' followed by a 'B string parameter'? It's like a symphony of C++ goodness.
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Diego
1 year ago
Great, let's go with C) then.
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Rolf
1 year ago
That's what I was thinking too. C) it is.
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Daniela
1 year ago
Yeah, I agree. It should print: A no parameters B string parameter.
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Chaya
1 year ago
I think C) is the correct answer.
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Deangelo
1 year ago
Wait, wait, wait... is the answer D) It prints: A no parametersA no parameters? I'm pretty sure that's wrong, but I can't quite figure out the right answer. Maybe I should have paid more attention in that inheritance lecture.
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Dustin
1 year ago
Ha! This is a classic constructor chaining problem. The answer is clearly C) It prints: A no parametersB string parameter. I've seen this kind of question before, it's all about understanding the order of constructor calls.
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Joaquin
1 year ago
Understanding constructor chaining is key in this scenario.
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Dell
1 year ago
Yes, the answer is definitely C) It prints: A no parametersB string parameter.
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Antonio
1 year ago
I agree, it's all about the order of constructor calls.
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Von
1 year ago
Hmm, this question is tricky. I think the answer is B) It prints: A string parameterA no parametersB string parameterA object A parameter. But I'm not sure, I might need to double-check the inheritance rules in C++.
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Kirby
1 year ago
The correct answer is C) It prints: A no parametersB string parameter. The constructors of the base classes are called in the order of inheritance, so the output should be A0 B1 C0.
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Karma
1 year ago
So the output should be A0 B1 C0.
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Rocco
1 year ago
Oh, I see. The constructors of the base classes are called in the order of inheritance.
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Daryl
1 year ago
I think the correct answer is C) It prints: A no parametersB string parameter.
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Huey
1 year ago
Hmm, that makes sense too. Let's see what others think before deciding.
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Xochitl
1 year ago
I disagree, I believe the answer is B because the code creates objects of class B and class C with string parameters.
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Huey
1 year ago
I think the answer is A because the code creates an object of class B without any parameters.
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Cathrine
1 year ago
Hmm, I see your point. But I still think option A makes more sense based on the code logic.
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Kenneth
1 year ago
I disagree, I believe the correct answer is C. It prints: A no parametersB string parameter.
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Cathrine
1 year ago
I think the answer is A. It prints: A no parametersA no parametersB string parameter.
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