单项选择题
下面程序输出的结果为
#include"iostream.h”
class A
｛
public:
A()｛cout＜＜"CLASSA"＜＜endl;｝
～A() ｛｝
｝;
class B:public A
｛
public:
B()｛cout＜＜"CLASS B"＜＜endl;｝
～B()｛｝
｝;
void main()
｛
A*p;
p＝new B;
B*q;
q＝new B;
｝
A．CLASS A CLASS B CLASS B CLASS B
B．CLASS A CLASS B CLASS A CLASS B
C．CLASS A CLASS B CLASS B
D．CLASS A CLASS B