[問題] virtual function驗證,不能執行

[phdch (我們都活在這個城市裡面)]

#include<stdio.h>


class Father
{
protected:
    int my_firstname(){return 100;}
    virtual int my_hand(){return 101;}

public:
    int get_firstname(){return my_firstname();}
    int get_hand(){return my_hand();}
};


class Kid:public Father
{
protected:
     int my_firstname(){return 200;};
     virtual int my_hand(){return 201;};
};


int main()
{
  int val1,val2,val3,val4;
  Kid kid;
  Father *ptr;

  val1=kid.get_firstname();
  val2=kid.get_hand();
  ptr=new Kid;
  val3=ptr->get_firstname();
  val4=ptr->get_hand();
  printf("val1=%d\n",val1);
  printf("val2=%d\n",val2);
  printf("val3=%d\n",val3);
  printf("val4=%d\n",val4);
  delete ptr;
return 0;
}




DEV C++ compile結果是
line   unit           message
ld     C:\dev\ld     cannot open crt2.o: No such file or directory.


好奇怪喔!
debug不出來
不知道有沒有高手可以知道我哪裡出錯了?
還有城市中val1,val2,val3,val4四數的值為何?
太感激



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