/* File: box2.C
   Another implementation of class Box.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>

#include "box2.h"

/* static (i.e., shared) members must be declared and initialized */
int Box::count = 0 ;


/* the default constructor makes a new box with random dimensions.  */

Box::Box() {
   if (count == 0) {		       /* first box? */
      srand48( (long) time(NULL) ) ;   /* set random seed */
   }

   length = random() ;
   height = random() ;
   width = random() ;
   count++ ;
}


/* A second constructor with arguments */
Box::Box(float len, float ht, float wd) {
   if (count == 0) {		       /* first box? */
      srand48( (long) time(NULL) ) ;   /* set random seed */
   }

   length = len ;
   height = ht ;
   width = wd ;
   count++ ;
}


/* Report vital stats */
void Box::identify() {
   
   if (length == 0.0 || height == 0.0  || width == 0.0) {
      printf("I am an invisible box\n") ;
   } else {
      printf("I am a box with length=%f, height=%f and width=%f\n",
      length, height, width) ;
   }
}


/* 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 ;
}