How to take input from the user with using set and get functions?

[elypheldia]

I try to take input from the user with using set and get functionsin different member function. This functions are member functions of same class.

[Ganado]

This just sounds like basic class design. Have you gone over what classes are? Do you know how to make a member function?

See examples at: https://cplusplus.com/doc/tutorial/classes/

Just as another example:

class Student {
  public:
    void setName(std::string name)
    {
        this->name = name;
    }

    std::string getName()
    {
        return name;
    }

  private:
    std::string name;
};

For user input, you can use cin.
See https://cplusplus.com/doc/tutorial/basic_io/

Student student;
cout << "Enter name: ";
string name;
cin >> name;
student.setName(name);
cout << student.getName() << '\n';