Conversion Operator : output of the following Program

#include

using namespace std;

 

class A {

 public:

    A(int ii = 0) : i(ii) {}

    void show() { cout << "i = " << i << endl;}

 private:

    int i;

};

 

class B {

 public:

    B(int xx) : x(xx) {}

    operator A() const { return A(x); }

 private:

    int x;

};

 

void g(A a)

{  a.show(); }

 

int main() {

  B b(10);

  g(b);

  g(20);

  getchar();

  return 0;

} 

 

Output:
i = 10
i = 20
Since there is a Conversion constructor in class A, integer value can be assigned to objects of class A and function call g(20) works. Also, there is a conversion operator overloaded in class B, so we can call g() with objects of class B.