box.cpp

一本语言类编程书籍

// Box.cpp Implementation of the Box class
#include "Box.h"

// Constructor
Box::Box(double aLength, double aWidth, double aHeight) {
  length = aLength > 0.0 ? aLength : 1.0;
  width = aWidth > 0.0 ? aWidth : 1.0;
  height = aHeight > 0.0 ? aHeight : 1.0;
}

// Calculate Box volume
double Box::volume() const{ return length*width*height; }  

// getXXX() functions
double Box::getLength()  const { return length; }
double Box::getWidth() const { return width; }
double Box::getHeight()  const { return height; }

// Function to compare two Box objects
// If the current Box is greater than the argument, 1 is returned
// If they are equal, 0 is returned
// If the current Box is less than the argument -1 is returned
int Box::compareVolume(const Box& otherBox) const {
  double vol1 = volume();                            // Get current Box volume
  double vol2 = otherBox.volume();                   // Get argument volume
  return vol1>vol2 ? 1 : (vol1<vol2 ? -1 : 0);
}