18.1C++ 多态的原理，虚函数表的覆盖

#include
using namespace std;

class Father
{
private:
    int data;
public:
    Father(int i):data(i){};
    ~Father();
public:
    void show()
    {
        cout << "this is father class" << endl;
    }
};

int main()
{
    cout< 
带virtual函数类的大小 
#include
using namespace std;

class Father
{
private:
    int data;
public:
    Father(int i):data(i){};
    ~Father();
public:
    virtual void show()
    {
        cout << "this is father class" << endl;
    }
};

int main()
{
    cout< 
 一下大了这么多，什么原因