base and derived class

Hi everyone,
I am trrying to figure out the difference between a base class and a derived class.
If a class includes another class, does that make it the derived class?
And the included class the base?
Thnx.
Kim


#ifndef HOURLY_H
#define HOURLY_H

#include "employ.h"

class HourlyWorker : public Employee {
public:
HourlyWorker( const char*, const char*, double, double );
double getPay() const;
void print() const;
private:
double wage;
double hours;
};

#endif


#ifndef EMPLOY_H
#define EMPLOY_H

class Employee {
public:
Employee( const char *, const char * ); // constructor
void print() const;
~Employee();
private:
char *firstName;
char *lastName;
};

#endif

In the example you give Employee is the base, and HourlyWorker the derived class. While you could say that HourlyWorker includes Employee, that terminology might confuse inheritance and composition (where a class has an object of another class imbedded in it). It's probably clearer to say that a derived class extends a base class.

What are the data members in the hourlyWorker object?

Are these it? I am use to seeing int and bool.
double wage;
double hours;
double getPay() constI want to rewrite the code in composition instead of inheritance. If someone could just get me started I think I could finish.
Thanks a million,
Kim


class HourlyWorker : public Employee {
public:
HourlyWorker( const char*, const char*, double, double );
double getPay() const; // calculate and return salary
void print() const; // overridden base-class print
private:
double wage; // wage per hour
double hours; // hours worked for week
};

#endif