请在以下代码中说明执行顺序

Question

1. I am trying to solve a quiz and came across this question.
   Please explain what happens internally that leads to this Output

    class B; class A { friend class B; public: ~A() { B boj(); cout << "object A destructor " << endl; } }; class B { public: ~B() { cout << "object B destructor " << endl; } }; int main() { A a; A aobj(); B bobj(); } 

   The output is:

   Object A destructor

2. I am trying to create a program where a user enters if he wishes to add another record, and if yes then create a new object for that record.

   So if I am including constructors, then how do I create a new object every time the user wants?

   (If I give a predefined size to the array of object, then constructor will be called, say 50 times and initialize all 50 objects, while the user may only want to enter less).

Answer 1

First, a is constructed. Then, a is destroyed.

The final two declarations in main , and the declaration inside ~B() , are all local function declarations and therefore don't "do" anything.