E36 Answer

/* --- rect.h --- */
void setWidth( int w );
void setHeight( int h );
int getArea();
int getPerimeter();



/* --- rect.c --- */
static int width = 0;
static int height = 0;

void setWidth( int w )
{
  width = w;
}

void setHeight( int h )
{
  height = h;
}

int getArea()
{
  return height*width;
}

int getPerimeter()
{
  return 2*height + 2*width;
}



/* --- mainRect.c --- */
#include "rect.h"

int main()
{
  setHeight( 4 );
  setWidth( 3 );

  printf("Area: %d  Perimeter: %d\n", getArea(), getPerimeter() );
  system("pause");
}