C++ Multilevel Inheritance Program

Multilevel Inheritance

Illustration 16.3 single inheritance

In multilevel inheritance a derived class itself acts as a base class to derive another class.

#include <iostream>

using namespace std;

class student //base class

{

private :

char name[20];

int rno;

public:

void acceptname()

{ 

cout<<"\n Enter roll no and name .. ";

cin>>rno>>name;

}

}

void displayname()

{

cout<<"\n Roll no :-"<<rno;

cout<<"\n Name :-"<<name<<endl;

}};

class exam : public student //derived class with single base class

{

      public:

      int mark1, mark2 ,mark3,mark4,mark5,mark6;

      void acceptmark()

      {

      cout<<"\n Enter lang,eng,phy,che,csc,mat marks.. ";

      cin>>mark1>>mark2>>mark3>>mark4>>mark5>>mark6; }

void displaymark(){

cout<<"\n\t\t Marks Obtained ";

cout<<"\n Language... "<<mark1;

cout<<"\n English... "<<mark2;

cout<<"\n Physics... "<<mark3;

cout<<"\n Chemistry... "<<mark4;

cout<<"\n Comp.sci... "<<mark5;

cout<<"\n Maths...  "<<mark6;

}

};

class result : public exam

{

      int total;

      public:

      void showresult()

      {

      total=mark1+mark2+mark3+mark4+mark5+mark6;

      cout<<"\nTOTAL MARK SCORED : "<<total;

      }

};

int main()

{

result r1;

r1.acceptname();        //calling base class function using derived class object

r1.acceptmark();        //calling base class function which itself is a derived

// class function using its derived class object

r1.displayname();      //calling base class function using derived class

//object

r1.displaymark();       //calling base class function which itself is a derived

//class function using its derived class object

r1.showresult();         //calling the child class function

return 0;

}

Output:

Enter roll no and name .. 1201 SARATHI

Enter lang,eng,phy,che,csc,mat marks.. 96 98 100 100 100 100

Roll no :-1201

Name :-SARATHI

Marks Obtained

Language... 96

English... 98

Physics... 100

Chemistry... 100

Comp.sci... 100

Maths...      100

TOTAL MARK SCORED      : 594

In the above program class “result “ is derived from class “exam” which itself is derived from class student.