为大学学生及教职人员建立一个异质链表，插入、删除和打印大学人员信息

#include <stdio.h>
#include <string.h>
class Node {
protected:
int   age;
char sex[10];
char name[20];
char number[20];
Node* next;
public:
Node(char* name_,int age_,char* sex_,char* number_) {
   age=age_; next=NULL;
   strcpy(name,name_); strcpy(sex,sex_); strcpy(number,number_);
}
static void add(Node** head,Node* t);
static void del(Node** head,char* number);
static void output(Node* head);
virtual void print() {
   printf("Name:%s   Age:%d   Sex:%s \n",name,age,sex);
   printf("Social Insurance Number:%s \n",number);
}
};
class Student:public Node {
protected:
int   grade;
float score;
public:
Student(char* name,int age,char* sex,char* number,int grade_,float score_)
   :Node(name,age,sex,number) {
   grade=grade_; score=score_;