#include <stdlib.h> #include <stdio.h> class B { public: B(int b) : m_b(b) {} operator int() { return m_b; } int operator()() { return m_b*2; } private: int m_b; }; class A { public: A(int i) { printf("Output is: %d\n", i); } }; int main() { int k = 6; A a( B(k) ); // what is the output of this program? return 0; }