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分析下列程序，写出程序运行结果____。#includeusing namespace std;class A{public:virtual void f( ){cout<<1; }void g( ){ cout<<2; }};class B: public A {public:virtual void f( ){ cout<<3; }void g( ){ cout<<4; }};void show( A &a) { a.f( ); a.g( ); }void print(A *p){ p->f(); p->g();}int main(void){B b;show(b);print(&b);cout<

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