( 12 )请将下面的程序补充完整,使得程序输出 “ 飘是的书 ” 。 #include using namespace std class Book{ public: Book(char *str) {strcpy(title,str)} 【 12 】 void PrintInfo() {cout$amp protected: char title[50] } class MyBook:public Book{ public: MyBook(char *s1,char *s2= ' ' ): 【 13 】 {strcpy(owner,s2)} virtual void PrintInfo() {cout$amp private: char owner[10] } int main(){ Book *prt=new MyBook( ' 飘 ' ) prt->PrintInfo() return 0 }