// File: box1.C
//  One implementation of class Box.

#include <iostream.h>
#include <stdlib.h>

#include "box1.h"


// Initialize new box with random dimensions.
//  Note: constructors have no return type! not even void

Box::Box() {
   length = random() ;
   height = random() ;
   width = random() ;
}


// Report vital stats
void Box::identify() {

   if (length == 0.0 || height == 0.0  || width == 0.0) {
      cout << "I am an invisible box\n" ;
   } else {
      cout << "I am a box with length=" << length
      << ", height=" << height << " and width=" << width << "\n" ;
   }
}


// Compute box volume
float Box::volume() {
   return length * height * width ;
}


// Double each dimension
void Box::grow() {
   length = length * 2 ;
   height = height * 2 ;
   width  = width  * 2 ;
}


// Halve each dimension
void Box::shrink() {
   length = length / 2 ;
   height = height / 2 ;
   width  = width  / 2 ;
}


// return random value between 1.0 and 10.0
float Box::random() {
   double r ;

   r = drand48() * 9.0 + 1.0 ;
   return (float) r ;
}