[問題] 多型陣列指標問題
程式執行沒有問題，如下：
#include<iostream.h>
#include<time.h>
using namespace std;
class Animal
{
public:
virtual int movemethod() {cout<<"Unspecified"<<endl;}
};
class Bird :public Animal
{
public:
virtual int movemethod(){cout<<"fly"<<endl;}
};
class Dog :public Animal
{
public:
virtual int movemethod(){cout<<"run"<<endl;}
};
class Fish :public Animal
{
public:
virtual int movemethod(){cout<<"swim"<<endl;}
};
int main()
{
Animal *ptr;
Bird bird;
Fish fish;
Dog dog;
Animal *a[6];
a[0]=&bird;
a[1]=&bird;
a[2]=&bird;
a[3]=&fish;
a[4]=&fish;
a[5]=&dog;
for(int i=1 ; i<=10 ; i++)
{
int randomunmber=rand()%6;
ptr=a[randomunmber];
ptr->movemethod();
}
system("pause");
}
===================================
其中
Animal *a[6];
a[0]=&bird;
a[1]=&bird;
a[2]=&bird;
a[3]=&fish;
a[4]=&fish;
a[5]=&dog;
上面是我第二次的寫法
一開始我想法是這樣：
Animal a[6];
a[0]=bird;
a[1]=bird;
a[2]=bird;
a[3]=fish;
a[4]=fish;
a[5]=dog;
然後
ptr=&a[randomunmber];
想請問為什麼不能這樣寫，很直覺的就想這樣寫呀 =口=
謝謝
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※ 編輯: conan77420 來自: 115.43.50.25 (05/19 21:36)
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對對，我就是想問這個
可是我是把子類別的物件塞到父類別的物件中
而不是父類別的放入子類別的
為什麼會消失呀
※ 編輯: conan77420 來自: 115.43.50.25 (05/19 22:09)
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