下面程序的运行结果是
#include＜iostream.h＞
class base{
protected:
int a;
public:
base( ) {cout ＜ ＜ "0";}
};
class base l: virtual base{
public:
base l ( ) {cout ＜ ＜"1";}
};
class base 2: virtual base{
public:
base2 ( ) {cout ＜ ＜"2";}
};
class derived: public base 1, public base2{
public:
derived( ) {cout ＜ ＜ "3";}
};
void main( )
{
derive obj;
cout ＜ ＜ endl;
}
A．0123
B．3120
C．0312
D．3012