// Source: "Software Design ...", John A Robinson, Newnes, 2004, page 157.
#include <cstring>
using namespace std;
#define	MAXSTUDENTS     80
#define	MAXNAMELENGTH   30
class student {
protected:
	char name[MAXNAMELENGTH];
	long id;
	float mark;
public:
	student(const char *n, const long i, const float m)
		{
		strcpy(name, n);
		id = i;
		mark = m;
		}
	float get_mark() const { return(mark); }
	virtual void calc_mark() {}
	};

class a_stream_student : public student {
	float midterm;
	float final;
public:
	a_stream_student(const char *n, const long i, const float mid, const float fin) :
	student(n, i, 0.0)	// This is called explicitly here to pass the arguments down
		{
		midterm = mid;
		final = fin;
		}
	void calc_mark()
		{
		mark = midterm*0.5 + final*0.5;
		}
	};

class b_stream_student : public student {
	float project;
	float final;
public:
	b_stream_student(const char *n, const long i, const float pro, const float fin) :
	student(n, i, 0.0)
		{
		project = pro;
		final = fin;
		}
	void calc_mark()
		{
		mark = project*0.4 + final*0.6;
		}
	};

class student_list {
protected:
	student *st[MAXSTUDENTS];
	int num_students;
public:
	student_list() { num_students = 0;  }    // Will be set by load_data
	~student_list()
		{
		for (int i = 0; i < num_students; i++)
			delete st[i];
		}
	int load_data(const char *);
	float average_mark() const;
	};

class software_design : public student_list {
public:
	software_design() : student_list() {};
	int work_out_marks();
	};