有如下程序: #include<iostream> using namespace std; class A {public: A(){cout<<"A’;} ~A(){cout<<"~A";} }; class B:public A {A*p; public:B(){cout<<"B";p=new A();}~B(){cout<<"~B";delete p;} }; int main() {B obj;return 0; } 执行这个程序的输出结果是
A.BAA~A~B~A
B.ABA~B~A~A
C.BAA~B~A~A
D.ABA~A~B~A