Question

What is the order of destructor calls with delete and End of main() in C++

Answer 1

#include <iostream>

using std::cout;
using std::endl;

class A {
	char *p;
public:
	A() : p(new char[255]) {}
	~A() { cout << "~A()" << endl; delete[] p; }
};

class B {
	A *Ap;
public:
	B() : Ap(new A()) {}
	~B() { cout << "~B()" << endl;  delete Ap; }
};

class C {
	A Ao;
public:
	C() : Ao() {}
	~C() { cout << "~C()" << endl; }
};

int main()
{
	B *Bp = new B();
	cout << "delete Bp;" << endl;
	delete Bp; 

	C *Cp = new C();
	cout << "delete Cp;" << endl;
	delete Cp;

	B b;
	C c;

	cout << "end main()" << endl;

	return 0;
} 


/*
run:

delete Bp;
~B()
~A()
delete Cp;
~C()
~A()
end main()
~C()
~A()
~B()
~A()

*/

 

70+ SQL courses for beginners and professionals