A *a=new C; *a那个类的#include using namespace std;class A{public:A(){cout
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A*a=newC;*a那个类的#includeusingnamespacestd;classA{public:A(){coutA*a=newC;*a那个类的#includeusingnamespace
A *a=new C; *a那个类的#include using namespace std;class A{public:A(){cout
A *a=new C; *a那个类的
#include
using namespace std;
class A
{
public:
A()
{
cout
A *a=new C; *a那个类的#include using namespace std;class A{public:A(){cout
C必须是A的派生类才行.a 应该是C类的对象.
不过,因为派生即为 is-a关系,因此也可以说a是A类的对象.
A *a=new C; *a那个类的#include using namespace std;class A{public:A(){cout
A *p=new C,A和C都是类,
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