单项选择题下面这个程序的结果是 #include<iostream.h> class A private: int a; public: void seta( );int geta( );; void A::seta( ) a = 1; int A::geta( ) return a; class B private: int a; public: void seta( );int geta( );; void B::seta( ) a=2; int B::geta( ) return a; class C:public A,public B private: int b; public: void display( );; void C::display( ) int b=geta( ); cout <<b; void main( ) C c; c.seta( ); c.display( );
单项选择题对如图所示二叉树进行前序遍历的结果为()
A. DYBEAFCZX B. YDEBFZXCA C. ABDYECFXZ D.ABCDEFXYZ