C++ Institute Exam CPA-21-02 Topic 1 Question 13 Discussion

Actual exam question for C++ Institute's CPA-21-02 exam

Question #: 13
Topic #: 1

[All CPA-21-02 Questions]

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

#include

using namespace std;

class complex{

double re;

double im;

public:

complex() : re(0),im(0) {}

complex(double x) { re=x,im=x;};

complex(double x,double y) { re=x,im=y;}

void print() { cout << re << " " << im;}

};

int main(){

complex c1(1,2);

c1.print();

return 0;

}

AIt prints: 1 0

BIt prints: 1 1

CIt prints: 1 2

DCompilation error

Show Suggested Answer

Suggested Answer: B

by Kimberely at Apr 24, 2024, 05:17 PM

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Cornell

8 days ago

Wait, so the answer is not 42? Darn, I thought C++ was all about the answer to the ultimate question of life, the universe, and everything.

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Whitney

9 days ago

Hmm, this code looks like it was written by a complex person. Get it? Complex? Ah, never mind.

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Jeannetta

10 days ago

I'm surprised that the compiler doesn't catch the issue with the constructors. Maybe it's a feature, not a bug!

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Nu

12 days ago

The output should be 1 2, as the `complex` object `c1` is initialized with 1 and 2 in the `main()` function.

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Francoise

13 days ago

The correct answer is D. Compilation error. The class `complex` has two private member variables `re` and `im`, and the constructors are not initializing them properly.

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Hyman

2 months ago

But the constructor for c1 is (1,2), so it should print 1 2, right?

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Juliana

2 months ago

I disagree, I believe the answer is A) It prints: 0 0

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Hyman

2 months ago

I think the answer is B) It prints: 1 1

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