求大神帮忙看一下哪里错了用的是Visual Studio 2017

#include<string>
using namespace std;
class Data
{

public:Data()
    {

    }
    char name[20];
    Data(char x[])
    {
        strcpy(name, x);
    }
};
class Teacher :virtual public Data
{
public:
    Teacher()
    {};
    int sal;
    Teacher(char x[], int y):Data(x)
    {
        sal = y;
    };
    void print()
    {
        cout << "姓名" << name << endl;
        cout << "工资" << sal << endl;
    }
};
class Student :virtual public Data
{
public:
    Student()
    {};
    int id;
    Student(char x[], int y):Data(x)
    {

        id = y;
    }
    void print()
    {
        cout << "姓名" << name << endl;
        cout << "学号" << id << endl;
    }
};
class Postgrad :public Student
{
public:
    Postgrad()
    {
    };
    char dn[20];
    Postgrad(char x[], int y, char z[]) :Student(x, y)
    {
        strcpy(dn, z);
    };
    void print()
    {
        cout << "姓名" << name << endl;
        cout << "学号" << id << endl;
        cout << "系别" << dn << endl;
    }
};
class Tpost :public Teacher, public Postgrad
{
public:
    Tpost(char x[], int y, char z[], int a):Teacher(x,a),Postgrad(x,y,z)
    {

    };
    void print()
    {
        cout << "姓名" << name << endl;
        cout << "学号" << id << endl;
        cout << "系别" << dn << endl;
        cout << "工资" << sal << endl;
    }
};
int main()
{
    Teacher a(zhang, 50);
    Student b(wang, 123456);
    Postgrad c(li, 1234567, yixue);
    Tpost d(liu, 22, faxue, 70);
    a.print();
    b.print();
    c.print();
    d.print();
    return 0;
}

zhang wang这种是字符串，都要用引号括起来

Teacher a("zhang", 50);
Student b("wang", 123456);

Teacher是类。建立具体的对象，需要使用 new 命令。

如：
Teacher a = new Teacher("zhang", 50);