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C++ Institute CPP Exam - Topic 10 Question 118 Discussion

What happens when you attempt to compile and run the following code?#include #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);};templatevoid 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
B) compilation error
C) program will display: world!Hello
D) program will run without any output
A) program will display: Hello world!

C++ Institute CPP Exam - Topic 10 Question 118 Discussion

Actual exam question for C++ Institute's CPP exam
Question #: 118
Topic #: 10
[All CPP Questions]

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

#include

#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;

}

Show Suggested Answer Hide Answer
Suggested Answer: B

by Lyla at Jan 28, 2026, 08:29 AM

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Trinidad
2 months ago
Right! It should be `A(T v) : _v(v) {}` not `A(T v): _v(v){}`.
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Cathrine
2 months ago
But what about the constructor? It seems off.
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Hildegarde
2 months ago
Yeah, looks good to me.
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Galen
2 months ago
I think it will compile fine.
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Davida
4 months ago
I don't think the `add` method will work as expected.
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Arlie
4 months ago
Surprised it works with templates like that!
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Arlette
4 months ago
Wait, is `_v` defined correctly? I think it should be `_v(v)` in the constructor.
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Trinidad
4 months ago
Totally agree, looks good to me!
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Luther
4 months ago
The code will compile without errors.
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Regenia
5 months ago
The code will compile and run, and the output will be "world! Hello". Nice use of template specialization there!
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Lou
5 months ago
Haha, looks like someone forgot to declare the type of the member variable _v. Classic rookie mistake!
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Danica
5 months ago
The code will compile and run, but it will throw a runtime error because the add(string& a) function is not defined for the A object.
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Dahlia
5 months ago
The code will not compile because the template class A has a member variable _v without a type specified.
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Latia
5 months ago
The code will compile and run successfully, and the output will be "world! Hello".
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Tom
5 months ago
I think the `add` method for `string` is supposed to prepend the string, but I'm not sure if the `insert` method is being used correctly.
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Ria
6 months ago
I feel like there might be an issue with the member variable `_v` since I can't recall if it was declared correctly.
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Lavina
6 months ago
I remember something similar where we had to define a method for a specific type. I hope the specialization for `string` works as expected.
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Asuncion
7 months ago
I think the code should compile, but I'm not entirely sure about the constructor syntax for the template class.
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Jesusita
7 months ago
This looks like a good opportunity to demonstrate my understanding of C++ templates and function overloading. I think I can work through this step-by-step and provide a clear explanation of the output.
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Wilson
7 months ago
I'm not sure I fully understand the purpose of the template class and the overloaded functions. I'll need to spend some time studying this code before I can confidently answer the question.
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Melissa
7 months ago
Okay, let me think this through step-by-step. The code creates a template class A with a member variable _v of type T, and two overloaded add() functions. One adds a T to _v, and the other adds a string to the beginning of _v. In the main function, an A object is created and the add() function is called with a string argument. I think I can figure out the output.
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Felton
7 months ago
Hmm, I'm a bit confused by the template syntax and the overloaded add() functions. I'll need to review that before attempting to solve this.
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Leota
7 months ago
This looks like a pretty straightforward C++ template class question. I think I can handle this.
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Jacqueline
1 month ago
Should print "Hello world!" at the end.
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Geraldo
1 month ago
I see a string manipulation happening.
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Georgene
2 months ago
Looks simple enough!
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