C++ Institute Exam CPP Topic 9 Question 91 Discussion

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

Question #: 91
Topic #: 9

[All CPP Questions]

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

#include

using namespace std;

template

class A {

T_v;

public:

A() {}

A(T v): _v(v){}

T getV() { return _v; }

void add(T & a);

void add(string & a);

};

template

void A::add(T & a) { _v+=a; }

void A::add(string & a) {

_v.insert(0, a);

}

int main()

{

Aa("Hello");

string s(" world!");

a.add(s);

cout << a.getV() <

return 0;

}

Aprogram will display: Hello world!

Bcompilation error

Cprogram will display: world!Hello

Dprogram will run without any output

Show Suggested Answer

Suggested Answer: B

by Casandra at Aug 03, 2024, 06:08 PM

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Geraldo

5 months ago

Wait, is this code even legal? I'm just going to guess option B and hope the compiler catches this mess. If not, I'll be the one in a world of 'Hello' and 'world!'

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Hubert

5 months ago

This is a bit of a brain-teaser, but I'm feeling confident. I'm going to have to go with option A - 'Hello world!'. That's my final answer, and no, I don't need to phone a friend.

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Norah

5 months ago

Ah, I see what's going on here. The string addition is using insert(0, a), so it's going to prepend the string. I'll go with option C - 'world!Hello'.

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Tony

4 months ago

Yes, that's correct. The string will be prepended, so it will show: world!Hello.

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Tony

5 months ago

I think you're right, it will display: world!Hello.

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Britt

5 months ago

Yes, the insert(0, a) will add 'world!' before 'Hello'. Option C is the answer.

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Shay

5 months ago

I think you're right, it will prepend the string. Option C sounds correct.

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Lucia

6 months ago

Hmm, let me think this through. The code is using templates, and it looks like there's a specialization for the string type. I'm going to guess option A - the program will display 'Hello world!'

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