水题求解

[woshihuiyuanma]

水题，求解~
http://soj.me/show_problem.php?pid=1001&cid=221

[huang_555]

看下在说．．．

[luciferisnotsatan]

可以用 dynamic_cast<>

[就想叫yoko]

#include <iostream>
#include <string>
using namespace std;

class A {
public:
	virtual ~A() {};
	virtual string fun()
	{
		return "grandpa";
	}
};

class B: public A
{
public:
	virtual string fun()
	{
		return "father";
	}
};
class C: public B
{
public:
	virtual string fun()
	{
		return "son";
	}

};

string verify(A *p)
{
	return p->fun();
}

int main()
{
	A a;
	B b;
	C c;

	cout << verify(&a) << endl;
	cout << verify(&b) << endl;
	cout << verify(&c) << endl;

	return 0;
}

[htc1510]

跟着学习下

[woshihuiyuanma]

四楼的同学~~~ 无语了

请看题目：
“Your submitted source code should include the whole implementation of the function verify, but without any class defined above.” ～～

~~~

[woshihuiyuanma]

谢二楼
题目做出来了

[woshihuiyuanma]

好心的各位帮帮忙啦~~~ 分数好商量啊~~~
链接可能点不开，
题目如下：

Description

Three classes A, B and C are shown below:

class A {
public:
virtual ~A() {};
};
class B: public A {};
class C: public B {};

You are to implement a function string verify(A *), such that it returns "grandpa" if the passed-in argument points to a class A object, and "father" for a class B object , "son" for a class C object.

Your submitted source code should include the whole implementation of the function verify, but without any class defined above.
No main() function should be included.

好心人一生平安呐~