C++ challenge from quizes

Question

Whats the output and how did you get it.

class A{
public:
A(){cout<<1;}
~A(){cout<<2;}
};
class B:public A{
public:
B(){cout<<3;}
};
int main(){
B obj1;
A obj2;
}

Answer 1

Remember that base class constructors get called before the derived class constructors, and all destructors are called when the program ends.

The first object is from class B.
// prints 1 from class A constructor and 3 from class B constructor

The second object is from class A.
// prints 1 from class A constructor

Program ends
// prints 2 twice when destructor for class A and class B object is called.

13122

Answer 2

Thank you so much i have more questions :D so stick around my profile.