问题 单项选择题

下面程序的结果是 #include<iostream.h> class A { public:A(){cout<<"construtA" <<endl;}virtual ~A() {cout << "destructA" <<endl;}}; class B:public A { }; class C:public A { }; class D:public B,public C { }; void main() { Dd;}

A.constructA

B.constructA

C.constmctA

D.constmctA destructAconstructA constmctA constructA destructAconstructA constructA destructAdestructA constructA destructA destmctA destmctAdestructA destmctA destructA

答案

参考答案:B

解析: 类D继承了类C和类B,所以在构造的时候分别构造类B和类C。

单项选择题
单项选择题