// File: box.C
// Final (?) implementation of class Box.

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

#include "box.h"

// Initialiize static members 
//
int Box::count = 0 ;
int Box::sequence = 0 ;


// Default constructor
//
Box::Box() {

#ifndef NDEBUG
   cerr << "Default Box constructor, this = " << this << endl ;
#endif 

   length = 1.0 ;
   height = 2.0 ;
   width = 3.0 ;
   count++ ;
   sequence++ ;
   serial_number = sequence ;
}


// Alternate constructor with parameters for box dimensions
//
Box::Box(float len, float ht, float wd) 

:   length(len), height(ht), width(wd)  // member initializers

{    
#ifndef NDEBUG
   cerr << "Alternate Box constructor, this = " << this << endl ;
#endif 

   count++ ;
   sequence++ ;
   serial_number = sequence ;
}


// Destructor
//
Box::~Box() {

#ifndef NDEBUG
   cerr << "Box destructor, this = " << this << endl ;
#endif
   
   count-- ;
}


// Print out vital stats
//
void Box::identify() {
   
   if (length == 0.0 || height == 0.0  || width == 0.0) {
      cout << "I am an invisible box.  " ;
   } else {
      cout << "I am a box with length="  << length 
           << ", height=" << height
           << " and width=" << width << ".  " ;
   }
   
   cout << "Serial Number = " << serial_number << endl ;
}


// Print out static members
//
void Box::report() {
    cout << "\n=== Report:" << endl ;
    cout << "There are " << count << " boxes in existence." << endl ;
    cout << "A total of " << sequence << " boxes have been made." << endl ;
    cout << "===\n" << endl ;
}


// 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 ;
}


// Friend function 
//
int compare(Box& A, Box& B) {
    if (A.length < B.length && A.height < B.height && A.width < B.width) {
       return -1 ;
    }
    if (A.length > B.length && A.height > B.height && A.width > B.width) {
       return 1 ;
    }
    return 0 ;
}