C++ Programming: A Practical Approach

Inheritance 245

If tomorrow a new requirement pops up to add one more float variable z into class A, it is

recommended to inherit class B from A as follows:

#include<iostream>

using namespace std;

class B: public A

{

float z;

public:

B(float a, float b,float c):A(a,b,c){z=c;}

void Display(){ base:: Display(); cout<<z<<endl; }

}

The disadvantages of inheritance are as follows:

(i) If the public or protected member(s) of a base class are changed and these meth-

ods are already used by a derived class or its object, it gets affected. For example, if

DisplayData member function in a base class is changed, the following code already

written gets affected. ...