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//

//  InheritanceExample - demonstrate an inheritance

//               relationship in which the subclass

//               constructor passes argument information

//               to the constructor in the base class

//

#include <cstdio>

#include <cstdlib>

#include <iostream>

#include <strings.h>

using namespace std;



// Advisor - empty class

class Advisor {};



const int MAXNAMESIZE = 40;

class Student

{

  public:

    Student(char *pName = "no name")

       : average(0.0), semesterHours(0)

    {

        strncpy(name, pName, MAXNAMESIZE);

        name[MAXNAMESIZE - 1] = '\0';

        cout << "constructing student "

             << name

             << endl;

    }



    void addCourse(int hours, float grade)

    {

        cout << "adding grade to " << name << endl;

        average = (semesterHours * average + grade);

        semesterHours += hours;

        average = average / semesterHours;

    }



    int hours( ) { return semesterHours;}

    float gpa( ) { return average;}



  protected:

    char name[MAXNAMESIZE];

    int  semesterHours;

    float average;

};



class GraduateStudent : public Student

{

  public:

    GraduateStudent(char *pName, Advisor& adv, float qG = 0.0) 

         : Student(pName), advisor(adv), qualifierGrade(qG)

    {

        cout << "constructing graduate student "

             << pName

             << endl;

    }



    float qualifier( ) { return qualifierGrade; }



  protected:

    Advisor advisor;

    float qualifierGrade;

};



int main(int nNumberofArgs, char* pszArgs[])

{

    Advisor advisor;



    // create two Student types

    Student llu("Cy N Sense");

    GraduateStudent gs("Matt Madox", advisor, 1.5);

    

    // now add a grade to their grade point average

    llu.addCourse(3, 2.5);

    gs.addCourse(3, 3.0);

    

    // display the graduate student's qualifier grade

    cout << "Matt's qualifier grade = " 

         << gs.qualifier() 

         << endl;



    // wait until user is ready before terminating program

    // to allow the user to see the program results

    system("PAUSE");

    return 0; 

}

i got this out of a c++ programming book i recently picked up, this bit of code is how to do inheritance the right way. it's a bit long but if you read it i'm sure you can find something useful if you code in c++.