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Pointers_to_Derived_class.cpp
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Pointers_to_Derived_class.cpp
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#include <iostream>
using namespace std;
class BaseClass
{
public:
int var_base;
void display()
{
cout << "Value of var_base is: " << var_base << endl;
}
};
class DerivedClass : public BaseClass
{
public:
int var_derived;
void display()
{
cout << "Value of var_base is: " << var_base << endl;
cout << "Value of var_derived is: " << var_derived << endl;
}
};
int main()
{
BaseClass BC_obj;
DerivedClass DC_obj;
// If we make a base_class_pointer then we can only access the data members and function members of the base class.
BaseClass *base_class_pointer = &DC_obj; // pointing base_class_pointer to derived class object
base_class_pointer->var_base = 4;
cout << "base class pointer" << endl;
base_class_pointer->display();
cout << endl;
// base_class_pointer->var_derived = 42; we cannot do this (it will throw an error)
//***************************************************************************************************************
// If we make a derived_class_pointer then we can access the data members and function members
// of the base class as well as derived class.
DerivedClass *derived_class_pointer = &DC_obj; // pointing derived_class_pointer to derived class object
derived_class_pointer->var_derived = 53;
derived_class_pointer->var_base = 78;
cout << "Derived class pointer" << endl;
derived_class_pointer->display();
return 0;
}
/*
Base class ka pointer banaya or agr usai point kradiya derived class k object pr tou sirf base class
k data members or function members accessible hogai (Derived class k accessible nahi honge).
Derived class ka pointer banaya or agr usai point kradiya derived class k object pr tou base class or derived class dono
k data members or function members accessible hogai.
SIMPLE AS THAT!
*/