以下程序的执行结果是______。
#include<iostream.h>
class base
{
public:
virtual void who( ){cout<<"base class"<<endl:}
};
class derrvel:public base
{
public:
void who( ){cout<<"derivel class"<<endl:}
};
class derive2;public base
{
public:
void who( ) {cout<<"derive2 class"<<endl;}
};
void main( )
{
base obj1,*P;
derive1 obj2;
derive2 obj3:
p=&obj1;
p->who( );
p=&obj2:
p->who( );
p=&obj3;
p->who( );
}
题库:计算机等级考试
类型:填空题
时间:2017-07-03 17:19:13
免费下载:《填空》Word试卷
以下程序的执行结果是______。
#include<iostream.h>
class base
{
public:
virtual void who( ){cout<<"base class"<<endl:}
};
class derrvel:public base
{
public:
void who( ){cout<<"derivel class"<<endl:}
};
class derive2;public base
{
public:
void who( ) {cout<<"derive2 class"<<endl;}
};
void main( )
{
base obj1,*P;
derive1 obj2;
derive2 obj3:
p=&obj1;
p->who( );
p=&obj2:
p->who( );
p=&obj3;
p->who( );
}
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