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     Faculty of Applied Science and Engineering, University of Toronto
               CSC181: Introduction to Computer Programming, Fall 2000

Tutorial Notes, Week 11
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Summary of Topics
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- C++ classes

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Example
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The following program models students who have the following attributes:

- a student ID
- a name
- a list of marks

It is essentially the C++ equivalent of the program from Week 4, which
used structs.

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Code
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#include <iostream.h>
#include <string.h>

#define NAME_LENGTH (20)
#define MARKS_LENGTH (10)

class Student {
	friend ostream& operator<< (ostream& os, const Student& s);

private:
	int id;
	char name[NAME_LENGTH];
	int marks[MARKS_LENGTH];
	int marksSize;

public:
	Student(const int id, const char* name);
	int Student::getId() const;
	const char* Student::getName() const;
	void addMark(const int mark);
	double getAverage() const;
};

Student::Student(const int i, const char* n) {
	id = i;
	strcpy(name, n);
	marksSize = 0;
}

void Student::addMark(const int m) {
	marks[marksSize] = m;
	marksSize++;
}

int Student::getId() const {
	return id;
}

const char* Student::getName() const {
	return name;
}

double Student::getAverage() const {
	if (marksSize == 0) {
		return 0.0;
	}
	else {
		int sum = 0;
		int i;

		for (i = 0; i != marksSize; i++) {
			sum += marks[i];
		}
		return (double)sum/marksSize;
	}
}

ostream& operator<< (ostream& os, const Student& s) {
	os << "{id = " << s.getId() << ", name = " << s.getName();
	os << ", average = " << s.getAverage();
	os << ", marksSize = " << s.marksSize << "}";
	return os;
}

int main(void) {
	Student s(3, "bob");

	cout << "ID = " << s.getId() << endl;
	cout << "Name = " << s.getName() << endl;

	cout << "Average = " << s.getAverage() << endl;
	s.addMark(80);
	cout << "Average = " << s.getAverage() << endl;
	s.addMark(70);
	s.addMark(92);
	cout << "Average = " << s.getAverage() << endl;

	cout << s << endl;

	return 0;
}