C++ | Operator Overloading | Question 6

Predict the output

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#include<iostream>
using namespace std;
class A
{
    int i;
public:
    A(int ii = 0) : i(ii) {}
    void show() {  cout << i << endl;  }
};
  
class B
{
    int x;
public:
    B(int xx) : x(xx) {}
    operator A() const {  return A(x); }
};
  
void g(A a)
{
    a.show();
}
  
int main()
{
    B b(10);
    g(b);
    g(20);
    return 0;
}

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(A) Compiler Error

(B) 


10
20


(C) 


20
20


(D) 


10
10



 Answer: (B) 

Explanation: Note that the class B has as conversion operator overloaded, so an object of B can be converted to that of A.


Also, class A has a constructor which can be called with single integer argument, so an int can be converted to A.

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