填空题 以下程序运行时输出到屏幕的结果中，第一行是 1，第二行是 2，第三行是 3。
#include＜iostream.h＞
#include＜string.h＞
class Person{
public:
Person(char *s)
{
name=new char[strlen(s)+1];
strcpy(name,s);
}
virtual void print()
{
cout＜＜"我的名字是:"＜＜name＜＜"/n";
}
protected:
char *name;
};
class Student:public Person
{
public:
Student(char *s,char *p):Person(s)
{
strcpy(num,p);
}
void print(char *s)
{
cout＜＜s;
cout＜＜"我的名字是:"＜＜name＜＜",学号是:"＜＜num＜＜". /n";
}
private:
char num[10];
};
class Professor:public Person
{
public:
Professor(char *s,int n):person(s)
{
publs=n;
}
void print()
{
cout＜＜"我的名字是:"＜＜name＜＜",发表论文数为:"＜＜publs＜＜"篇
/n";
}
private:
int publs;
};
void main()
{
Person *p;
Person x("张明");
Student y("王海","20120501");
Professor z("李涛",5);
p=&x;
p-＞print();
p=&y;
p-＞print();
p=&z;
p-＞print();
}