#include <iostream>
#include<String>
using namespace std;
class Teacher
{protected:
void show()
{
    cout<<"num:"<<num<<endl;
        cout<<"name:"<<name<<endl;
        cout<<"age:"<<age<<endl;
        cout<<"address:"<<add<<endl;
}
    string name;
    string add;
    int age;
    int num;
   
    string title;
};
class Cadre
{
public:
   
    string name;
    string add;
    int age;
    int num;
    string post;
   
   
private:

};
class Teacher_Cadre:virtual public Teacher,virtual public Cadre
{   public:
void get();
 void display();
    int wages;
};
void Teacher_Cadre::display()
{
        show();
        cout<<title<<endl<<post<<endl<<wages;
}
void Teacher_Cadre::get()
{
    cout<<"input num,name,add,age,title,post,wages:"<<endl;
    cin>>num>>name>>add>>age>>title>>post>>wages;
}

  int main()
  {
       Teacher_Cadre c;
      c.get();
      c.display();
return 0;
  }

函数前面加virtual

答非所问

报错说这里有歧义，但我申明了虚拟类啊，请问错哪了

呵呵,我只是说楼上的貌似说错了
虚继承没怎么用过

在
void Teacher_Cadre::get()
{
    cout<<"input num,name,add,age,title,post,wages:"<<endl;
    cin>>num>>name>>add>>age>>title>>post>>wages;
}
中，你这里的num是指 Teacher::num 还是 Cadre::num ？神仙或许知道，但编译器肯定不知道。

但我前面申明为虚拟类了的啊

听不懂你在说什么，那好吧，既然“前面申明为虚拟类了”，那你希望
void Teacher_Cadre::get()
{
    cout<<"input num,name,add,age,title,post,wages:"<<endl;
    cin>>num>>name>>add>>age>>title>>post>>wages;
}
中的num是指 Teacher::num 还是 Cadre::num ？

如果这样的话就行：
#include <iostream>
#include<String>
using namespace std;
class Teacher
{protected:
void show()
{
    cout<<"num:"<<num<<endl;
        cout<<"name:"<<name<<endl;
        cout<<"age:"<<age<<endl;
        cout<<"address:"<<add<<endl;
}
    string name;
    string add;
    int age;
    int num;
   
    string title;
};
class Cadre :virtual public Teacher
{
public:
   
    string name;
    string add;
    int age;
    int num;
    string post;
   
   
private:

};
class Teacher_Cadre:virtual public Cadre
{   public:
void get();
void display();
    int wages;
};
void Teacher_Cadre::display()
{
        show();
        cout<<title<<endl<<post<<endl<<wages;
}
void Teacher_Cadre::get()
{
    cout<<"input num,name,add,age,title,post,wages:"<<endl;
    cin>>num>>name>>add>>age>>title>>post>>wages;
}

  int main()
  {
       Teacher_Cadre c;
      c.get();
      c.display();
return 0;
  }
但我想问我前面那种哪错了呢，该怎样改

求解