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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
void A
_v.insert(0, a);
}
int main()
{
A
string s(" world!");
a.add(s);
cout << a.getV() < return 0; }
Suggested Answer: B
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26 comments · newest first
TR
Trinidad
3 months ago
Right! It should be `A(T v) : _v(v) {}` not `A(T v): _v(v){}`.
CA
Cathrine
3 months ago
But what about the constructor? It seems off.
HI
Hildegarde
3 months ago
Yeah, looks good to me.
GA
Galen
4 months ago
I think it will compile fine.
DA
Davida
5 months ago
I don't think the `add` method will work as expected.
AR
Arlie
5 months ago
Surprised it works with templates like that!
AR
Arlette
5 months ago
Wait, is `_v` defined correctly? I think it should be `_v(v)` in the constructor.
TR
Trinidad
6 months ago
Totally agree, looks good to me!
LU
Luther
6 months ago
The code will compile without errors.
RE
Regenia
6 months ago
The code will compile and run, and the output will be "world! Hello". Nice use of template specialization there!
LO
Lou
6 months ago
Haha, looks like someone forgot to declare the type of the member variable _v. Classic rookie mistake!
DA
Danica
6 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.
DA
Dahlia
6 months ago
The code will not compile because the template class A has a member variable _v without a type specified.
LA
Latia
7 months ago
The code will compile and run successfully, and the output will be "world! Hello".
TO
Tom
7 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.
RI
Ria
7 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.
LA
Lavina
8 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.
AS
Asuncion
8 months ago
I think the code should compile, but I'm not entirely sure about the constructor syntax for the template class.
JE
Jesusita
8 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.
WI
Wilson
8 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.
ME
Melissa
8 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.
FE
Felton
9 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.
LE
Leota
9 months ago
This looks like a pretty straightforward C++ template class question. I think I can handle this.
JA
Jacqueline
3 months ago
Should print "Hello world!" at the end.
GE
Geraldo
3 months ago
I see a string manipulation happening.
GE
Georgene
3 months ago
Looks simple enough!