C++ Operator Overloading Interview Question:

program Output:

#include <iostream>
using namespace std;
class sample
{
public:
sample(int i) : m_i(i) { }
public:
int operator()(int i = 0) const
{
return m_i + i;
}
operator int () const
{
return m_i;
}
private:
int m_i;
friend int g(const sample&);
};
int f(char c)
{
return c;
}
int main()
{
sample f(2);
cout << f(2);
return 0;
}
a) 3
b) 4
c) 5
d) None of the mentioned