#include<iostream.h>
#include<string.h>
//
// 一个简单的大学管理系统，其中有学生和职工，职工中有教师。
// 类 data_rec 是虚基类，它包含了所有派生类共有的数据成员，
// 职工类 Employee 和学生类 Student 为虚基类 Data_roc 的派
// 生类，教师类 Teacher为职工 Employee 的派生类，在职大学生
// E_student 是职工类 Employee 和学生类 Student 的共同派生
// 类。
//
//

const char null='\0';             // 定义null为常数据成语空字符

static char *strsave(char *s)     //  给一个指针赋值
{
    char *p;
    p=new char[strlen(s)+1];
    strcpy(p,s);
    return p;
}

class Data_rec {                   // 定义一个虚基类Data_rec，包括姓名和id编号
protected:
    char *name;
    char *id_number;
public:
    Data_rec()                     // 用析构函数初始化
    {
        name=null;
        id_number=null;
    }

    Data_rec(char *name1,char *id_number1)   // 用析构函数进行取数
    {
        name=strsave(name1);
        id_number=strsave(id_number1);
    }

    ~Data_rec()
    {
        delete []name;
        delete []id_number;
    }

    void print()                   // 输出名子和id号
    {
        cout<<"\n"<<"name: "<<name<<endl;
        cout<<"\n"<<"id_number: "<<id_number<<endl;
    }
};


//
// 虚基类的派生类 Student
class Student: virtual public Data_rec {
protected:
    char *major;           // 主要学科
    long int stu_no;       // 学生学号
    int level;             // 年纪
public:
    Student(char *name1,char *id_number1,char *major1,long int
        stu_no1,int level1): Data_rec(name1,id_number1)
    {
        major=strsave(major1);
        stu_no=stu_no1;
        level=level1;
    }
    ~Student()
    {  delete []major; }
    void print();           // 输出学生姓名，id号，科目，学号，年纪
};

// 定义输出学生的函数print()
void Student::print()
{
    Data_rec::print();
    cout<<"Major: "<<major<<endl;
    cout<<"stu_no: "<<stu_no<<endl;
    cout<<"level: "<<level<<endl;
}



// 虚基类派生类 Employee，部门，薪水
class Employee: virtual public Data_rec {
protected:
    char *dept;
    double salary;

public:
    Employee(char *name1,char *id_number1,char *dept1,double salary1)
        : Data_rec(name1,id_number1)
    {
        dept=strsave(dept1);
        salary=salary1;
    }
    ~Employee()
    {  delete []dept; }
    void print();            // 输出职工的数据
};

// 定义职工输出函数
void Employee::print()
{
    Data_rec::print();
    cout<<"Department: "<<dept<<endl;
    cout<<"salary: "<<salary<<endl;
}


// Employee 类派生类 Teacher，有职位
class Teacher: virtual public Employee {
protected:
    char *title;
public:
    Teacher(char *name1,char *id_number1, char *dept1,double salary1,
        char *title1): Data_rec(name1,id_number1),Employee(name1,id_number1,dept1,salary1)
    {  title=strsave(title1); }
    ~Teacher()
    {  delete []title; }
    void print();           // 输出老师的数据
};

// 定义输出老师的函数
void Teacher::print()
{
    Employee::print();
    cout<<"title: "<<title<<endl;
}


// 多继承派生类 _Student 继承两个基类 Employee 和 Student
class E_Student: public Employee,public Student {
public:
    E_Student(char *name1,char *id_number1,char *major1,long int stu_no1,int level1,
        char *dept1,double salary1): Data_rec(name1,id_number),Employee(name1,id_number1,
        dept1,salary1),Student(name1,id_number1,major1,stu_no1,level1) { }
    void print();                     // 输出在职学生的数据
};

// 定义输出在职学生的函数
void E_Student::print()
{
    Student::print();
    cout<<"Department: "<<dept<<endl;
    cout<<"salary: "<<salary<<endl;
}


//
// 创建对象
int main()
{
    Student my_student("zhangming","0101234567891","Computer_science",1234,4);
    Employee my_employee("chandaiwei","01043453543","Electrical",7.20);
    Teacher my_teacher("lixiaoping","010234445412","computer",12.34,"professor");
    E_Student my_e_student("zhangming","0101234567","Computer",203478,3,"Electtical",7.20);
    cout<<"\n";
    //my_student.print();
    //cout<<"\n";
    //my_employee.print();
    //cout<<"\n";
    my_teacher.print();
    cout<<"\n\n";
    my_e_student.print();
    return 0;
}

class E_Student: public Employee,public Student {
 public:
     E_Student(char *name1,char *id_number1,char *major1,long int stu_no1,int level1,
         char *dept1,double salary1): Data_rec(name1,id_number),Employee(name1,id_number1,//
         dept1,salary1),Student(name1,id_number1,major1,stu_no1,level1) { }
     void print();                     // 输出在职学生的数据
 };

上面的划线的id_number 改为 id_number1

我错了，可能我昨晚实在是太累啦，竟然这样的错误都没发现！
      多谢你啦，一阵之后在给分你。