/* Rectangle.c
   Class implementation for rectangles
*/

/* Import some "standard" classes */
#include <stdio.h>
#include <stdlib.h>

#include "Rectangle.h"
/* Import the specification of this class -
   this enables the compiler to check that the specification and
   this implementation are consistent */

/* Definition of the attributes of the class */
struct rectangle {
	double height;
	double width;
	};

/**** Methods for operating on the class ****/

/* Constructor */
Rectangle ConsRectangle( double height, double width )
	{
	Rectangle r;
	r = malloc( sizeof(struct rectangle) );
	if ( r == NULL ) {
		printf("ConsRectangle: Insufficient memory\n");
		}
	else
		{
		r->height = height;
		r->width = width;
		}
	return r;
	}

/* Destructor */
void DestroyRectangle( Rectangle r )
	{
	free( r );
	}

/* Obtain the current height */
double Height( Rectangle r ) {
	return r->height;
	}

/* Change the height */
void SetHeight( Rectangle r, double height ) {
	r->height = height;
	}

/* Obtain the current width */
double Width( Rectangle r ) {
	return r->width;
	}

/* Change the width */
void SetWidth( Rectangle r, double width ) {
	r->width = width;
	}

/* Properties of rectangles */
double Perimeter( Rectangle r ) {
	return 2*r->width + 2*r->height;
	}

double Area( Rectangle r ) {
	return r->width*r->height;
	}