Program Of Multilevel Inheritance In C++

#include<iostream.h>

#include<conio.h>

class base

{

private:

int a;

public:

void getdatab(int x)

{

a=x;

}

void displayb()

{

cout<<"\n base value is="<<a;

}

} ;

class derive : public base     // Single Inheritence

{

private:

int b;

public:

void getdatad(int y)

{

b=y;

}

void displayd()

{

cout<<"\n derive value is="<<b;

}

} ;

class derive1 : public derive     // Multilevel Inheritence

{

private:

int c;

public:

void getdatad1(int z)

{

c=z;

}

void displayd1()

{

cout<<"\n derive1 value is="<<c;

}

} ;

main()

{

clrscr();

derive1 d1;

d1.getdatab(5);

d1.getdatad(7);

d1.getdatad1(9);

d1.displayb();

d1.displayd();

d1.displayd1();

getch();

}

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Multilevel Inheritance

Derived a new class from another derived class.It is known 
as multilevel inheritance.
example:
grandfather->father->son.