What will be the output of the following C++ code?

#include <iostream>
using namespace std;
void duplicate (int& a, int& b, int& c)
{
    a *= 2;
    b *= 2;
    c *= 2;
}
int main ()
{
    int x = 1, y = 3, z = 7;
    duplicate (x, y, z);
    cout << x << y << z;
    return 0;
}

What is a class in C++?

A. A collection of functions

B. A reserved keyword in C++

C. A blueprint for creating objects

D. A way to declare arrays of data

Which keyword is used to create an object of a class in C++?

A. new

B. create

C. object

D. None of the above

What is an object in C++?

A. A reserved keyword in C++

B. An instance of a class

C. A way to declare arrays of data

D. None of the above

What is the purpose of a constructor in C++?

A. To hide the implementation details of a class

B. To create multiple instances of a class

C. To initialize the object's data members

D. To destroy the object