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40

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/*
*   FILE:    student.person.c
*   AUTHOR:  R.G.
*   CREATED: June 7, 1990
*   
*   Think C program illustrating derivation of the Student class
*   from the Person class.
*
*   PROJECT CONTENTS:
*   student.person.c, ANSI, oops libraries
*/

# include <oops.h>
# include <stdio.h>

/******************************************************************
*   Definition of Person class and its methods (no changes here!)
******************************************************************/
struct Person:indirect
{
    int     age;
    int     weight;

    void    set(void);
    void    print(void);
};

void    Person::set(void)
{
    int     new_age,
            new_weight;

    printf("Enter age and weight separated by spaces:\n");
    scanf("%d %d",&new_age,&new_weight);

    age = new_age;
    weight = new_weight;
}

void    Person::print(void)
{
    printf("My age is %d\n",age);
    printf("My weight is %d\n",weight);
}

/******************************************************************
*   Definition of new Student class and its methods
******************************************************************/
struct Student:Person
{
    int     id_number;

    void    set(void);
    void    print(void);
};

void    Student::set(void)
{
    int     new_id;

    printf("Enter student id number:\n");
    scanf("%d",&new_id);

    id_number = new_id;

    inherited::set();
}

void    Student::print(void)
{
    printf("My id number is %d\n",id_number);
    inherited::print();
}

/******************************************************************
*   main() function (only one change)
******************************************************************/
main()
{
    Person  *person;

    person = new(Student);
    person->set();
    person->print();
    delete(person);
}



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A TC program using the Person and Student classes:

-- part contents for background part 6
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Derivation of Student class from Person class