关于多态的题目

#include <stdio.h>
#include <tchar.h>
#include <iostream>

using namespace std;


class A
{
public:
 virtual void Test(int intTemp=50);

};

class B:public A
{
public:
 virtual void Test(int intTemp=100);
};


void A::Test( int intTemp )
{
 cout<<"This is A:"<<intTemp;
}

void B::Test( int intTemp/*=100*/ )
{
 cout<<"This is B:"<<intTemp;
}



int _tmain(int argc, _TCHAR* argv[])
{
 B b;
 A& a = b;
 a.Test();
 
 return 0;
}

输出为 This is B:50