void maino worker w teacher t; person* p; p=&w; ∥w是 worker类对象 p->printInfo0; p=&t; p->printInfoo 人民邮电出版社 POSTS tEl OM PRE 动此映void main() { worker w; teacher t; person* p; p = &w; // w是worker类对象 p->printInfo(); p = &t; p->printInfo(); }