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题目内容 (请给出正确答案)

请阅读以下一段程序,并给出答案。

class A

{

public:

A(){ doSth() }

virtual void doSth(){ printf("I am A");}

}

class B:public A

{

public:

virtual void doSth(){ printf("I am B");}

}

B b;

执行结果是什么?为什么?


参考答案

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