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#include <iostream>
using namespace std;
 
class A {
	public:
		void method() {
			cout << "hi";
		}
};
 
class B {
	public:
		virtual void method() = 0;
};
 
class D : public A, public B {
	public:
		//virtual void method();
};
 
int main() {
	D d;
	d.method();
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:22:4: error: cannot declare variable ‘d’ to be of abstract type ‘D’
  D d;
    ^
prog.cpp:16:7: note:   because the following virtual functions are pure within ‘D’:
 class D : public A, public B {
       ^
prog.cpp:13:16: note: 	virtual void B::method()
   virtual void method() = 0;
                ^
prog.cpp:23:4: error: request for member ‘method’ is ambiguous
  d.method();
    ^
prog.cpp:13:16: note: candidates are: virtual void B::method()
   virtual void method() = 0;
                ^
prog.cpp:6:8: note:                 void A::method()
   void method() {
        ^

Standard output is empty