无法在C++子类中使用虚函数

我正在做一个虚拟函数程序，里面有三个班，一个是人，一个是教授，一个是学生。该人由教授和学生公开继承。这里我想在教授和学生中输入一些参数。为了输入和输出它们，我在每个类中创建了getdata和putdata。在person类中，这些函数是虚拟定义的。但是在代码中我有一些错误，例如-

Solution.cpp: In function ‘int main()’:
Solution.cpp:84:26: error: invalid new-expression of abstract class type ‘Professor’
             per[i] = new Professor;
                          ^~~~~~~~~
Solution.cpp:20:7: note:   because the following virtual functions are pure within ‘Professor’:
 class Professor : public Person
       ^~~~~~~~~
Solution.cpp:16:18: note:   ‘virtual void Person::putdata()’
     virtual void putdata() = 0;
                  ^~~~~~~
Solution.cpp:87:27: error: invalid new-expression of abstract class type ‘Student’
         else per[i] = new Student; // Else the current object is of type Student
                           ^~~~~~~
Solution.cpp:42:7: note:   because the following virtual functions are pure within ‘Student’:
 class Student: public Person
       ^~~~~~~
Solution.cpp:16:18: note:   ‘virtual void Person::putdata()’
     virtual void putdata() = 0;
                  ^~~~~~~  

此功能：

void pushdata()
    {
        cout<<name<<" "<<age<<" "<<publications<<"\n";
    }

请注意，如果对要重写的函数进行重写，如果出错，编译器将给出一个错误。

putdata和pushdata不是一回事。很高兴了解override关键字。

void pushdata()
    {
        cout<<name<<" "<<age<<" "<<publications<<"\n";
    }

void putdata() override
    {
        cout<<name<<" "<<age<<" "<<publications<<"\n";
    }