Common methods for accessing private member variables in C + +

The object of the class cannot directly access the private member variable of the class declaration, otherwise it destroys the purpose of information hiding.
In C + +, to prevent some data members or member functions from being accessed directly from the outside, you can declare them private so that the compiler blocks any direct access from external non-friends.
The common access methods for private member variables are as follows:

(1) Assigning a value to a private member through a public function

#include <iostream>  using namespace std;  Class Test  {  private:  int x, y;  Public:  void SetX (int a)  {  x=a;  }  void sety (int b)  {  y=b;  }  void print (void)  {  cout<< "x=" <<x<< ' \ t ' << "y=" <<y<<endl;  }  } ; int main ()  {  Test p1;  P1.setx (1);  P1.sety (9);  P1.print ();  return 0;  }  

(2) accessing private data members with pointers

#include <iostream>  using namespace std;  Class Test  {  private:  int x, y;  Public:  void SetX (int a)  {  x=a;  }  void sety (int b)  {  y=b;  }  void Getxy (int *px, int *py)  {  *px=x;    Extract x, y value  *py=y;  }  };  int main ()  {  Test p1;  P1.setx (1);  P1.sety (9);  int a, B;  P1.getxy (&a,&b);  Will A=x, b=y  cout<<a<< ' \ t ' <<b<<endl;  return 0;  }  

(3) Accessing private data members with functions

#include <iostream>  using namespace std;  Class Test  {  private:  int x, y;  Public:  void SetX (int a)  {  x=a;  }  void sety (int b)  {  y=b;  }  int GetX (void)  {  return x;   return x value  }  int GetY (void)  {  return y;   Returns the Y value  }  };  int main ()  {  Test p1;  P1.setx (1);  P1.sety (9);  int a, B;  A=p1.getx ();  B=p1.gety ();  cout<<a<< ' \ t ' <<b<<endl;  return 0;  }     

(4) Accessing private data members with references

#include <iostream>  using namespace std;  Class Test  {  private:  int x, y;  Public:  void SetX (int a)  {  x=a;  }  void sety (int b)  {  y=b;  }  void Getxy (int &px, int &py)//reference  {  px=x;    Extract x, y value  py=y;  }  };  int main ()  {  Test p1,p2;  P1.setx (1);  P1.sety (9);  int a, B;  P1.getxy (A, b); Will A=x, b=y  cout<<a<< ' \ t ' <<b<<endl;  return 0;  }  

Common methods for accessing private member variables in C + +