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using namespace std; #include<iostream> class A { public: A() { std::cout << "A\n"; } }; class B: public A { public: B() { std::cout << "B is derived class\n"; } }; int main() { A * a=new A(); //valid B * b=new B(); //valid A * aa=new B(); //valid B * bb=new A(); //invalid return 0; }

Compiling Program...

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Standard Input: Interactive Console Text
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