C++ Institute Exam CPP Topic 3 Question 64 Discussion

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

Question #: 64
Topic #: 3

[All CPP Questions]

Which method added to class B at the marked spot will allow the code below to compile? Choose

all possible solutions.

#include

using namespace std;

class B { int val;

public:

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

int getV() const {return val;}

/* Insert Code Here */

};

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};

vector v1(t, t+10);

sort(v1.begin(), v1.end(), greater());

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

return 0;

}

Abool operator < (const B & v) const { return val<v.val;}

Bbool operator > (const B & v) const { return val<v.val;}

Cbool operator > (const B & v) const { return val>v.val;}

Dbool operator == (const B & v) const { return val==v.val;}

Eoperator int () const { return val; }

Show Suggested Answer Hide Answer

Suggested Answer: B

by Antione at Mar 23, 2023, 11:52 PM

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Dusti
27 days ago

I'm with Corinne and Roselle on this one. Option C is the obvious choice, unless you want your code to compile but sort your vector in the wrong order.

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Roosevelt
28 days ago

Come on, folks, this is a no-brainer. Option C is the way to go. How else would you expect the sort function to work with your custom class?

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Annmarie
1 months ago

Hmm, I'm not sure about that. Maybe we should also consider option E, as that could potentially work by allowing the class B to be implicitly converted to an integer for the sort function.

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Melina
8 days ago

But what about option A? It defines the less than operator.

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Louisa
14 days ago

I think option E could work, it allows implicit conversion to int.

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Roselle
1 months ago

I agree with Corinne. Option C is the way to go, as it will provide the necessary comparison function for the sort operation.

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Corinne
2 months ago

Option C seems like the correct answer. We need to define a greater-than operator for the class B to allow the sort function to work as expected.

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William
7 days ago

Yes, that will allow the sort function to work properly.

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Tess
23 days ago

I agree, we need to define a greater-than operator for the class B.

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Annamae
1 months ago

I think option C is the right choice.

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Kerry
2 months ago

I see your point, but I still think A is the best choice because it compares the values correctly.

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Carey
2 months ago

I disagree, I believe the correct answer is C.

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Kerry
3 months ago

I think the answer is A.

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