求教高人！！！一个c++关于继承的问题望帮助~

刚学C++不久，遇到问题不知如何修改，源代码如下，望高手赐教
#include"stdafx.h"
#include <iostream>
#include <string>
using namespace std;
class person{
protected:
    char *name;
    int id;
public:
    person(char *n,int i){
    name=new char[strlen(n)+1];
    strcpy(name,n);
    id=i;
    }
    void display(){
        cout<<"人名："<<name<<"身份证："<<id<<endl;
    }
    ~person(){ delete name;}
};
class teacher:virtual public person{
public:
    teacher(char *n,int i,char *d1,char *d2):person(n,i){
    degree=new char[strlen(d1)+1];
    strcpy(degree,d1);
    dep=new char[strlen(d2)+1];
    strcpy(dep,d2);
    }
    void display(){
        person::display();
        cout<<endl;
        cout<<"学历："<<degree<<"部门："<<dep<<endl;
    }
protected:
    char *degree;
    char *dep;
};
class student:virtual public person{
public:
    student(char *n,int i,int age,int s):person(n,i){
        old=age;
        sno=s;
        }
    void display(){
        person::display();
        cout<<endl;
        cout<<"年龄："<<old<<"学号："<<sno<<endl;
    }
protected:
    int old;
    int sno;
};
class stud{
protected:
    char *addr;
    char *tel;
public:
    stud(char *a,char *t){
    addr=new char[strlen(a)+1];
    strcpy(addr,a);
    tel=new char[strlen(t)+1];
    strcpy(tel,t);
    }
    void display(){
        cout<<"住址："<<addr<<"电话："<<tel<<endl;
    }
};
class score:public stud,public student{
public:
    score(float m,float e):stud(),student(){
        math=m;
        eng=e;
    }
    void display(){
        cout<<"数学："<<math<<"英语："<<eng<<endl;
    }   
protected:
    float math;
    float eng;

}
int main(){
teacher t1("笑",1218,"本科","财大");
score c1(78.5,80.0);
t1.display();
c1.display();
}