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class Base
{
public:
int m_a;
Base (int a = 2) : m_a(a) {}
virtual ~Base() {printf( " A %d", m_a);}
};
class Derived : public Base
{
public:
Derived (int a =4) : Base (a) {}
virtual ~ Derived () {printf( "B %d", m_a);}
};
int main()
{
Base *aa, bb;
Derived cc(3);
aa = new Derived;
delete aa;
system( "pause");
return 0;
}