题目:写出下列程序的输出结果。#includeclass AA{public : AA{}{cout<<"ConstructorofAA.
";fun( );} virtual void fun( ){cout<<"AA::fun( )is called.
";}};class BB:public AA{public :BB( ){cout<<"Constructor of BB.
"; fun( );}void fun( ){cout<<"BB::fun( )is called.
";}};void main( ){BB d;}
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