Many of the peoples think that deriving a class from other derived classes is a confusing thing, that’s why I have written this article to let them know that deriving such classes is no different. To the compiler it doesn’t matter whether the class from which a new class is derived is itself derived or not.
The example program below illustrates this:
// -- INHERITANCE --
// Example program to illustrate
// the derivation of a class
// from another derived class
#include<iostream.h>
// base class
class one
{
int a;
public:
void setone(int num){a=num;}
int getone(){return a;}
};
// derived from base class 'one'
class two:public one
{
int b;
public:
void settwo(int num){b=num;}
int gettwo(){return b;}
};
// derived from derived class
// 'two'
class three:public two
{
int c;
public:
void setthree(int num){c=num;}
int getthree(){return c;}
};
void main(void)
{
// declare objects
one o1;
two o2;
three o3;
// set values
o1.setone(1);
o2.setone(10);
o2.settwo(20);
o3.setone(100);
o3.settwo(200);
o3.setthree(300);
// display values
cout<<o1.getone()<<endl<<endl;
cout<<o2.getone()<<endl;
cout<<o2.gettwo()<<endl<<endl;
cout<<o3.getthree()<<endl;
cout<<o3.getthree()<<endl;
cout<<o3.getthree()<<endl<<endl;
}
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