3. (28 points) Class Design (1) (17 points) Define a class called Box. Your clas

Question

3. (28 points) Class Design (1) (17 points) Define a class called Box. Your class will have member variables of type int to represent the width, length, and height of a box. The class design should meet the encapsulation 00P principles and also include the following member functions. You need to write function definition for the declared functions; and NONE of these functions should be inline! (a) a constructor to set the width, length, and height; a default constructor; ) to save time, only write the accessor and mutator functions for the length of the ox; and then you may assume all other accessor and mutator functions are defined may call them later when needed d) a member function that calculates the volume of the box, and this function ld be accessible from anywhere the object is visible.

Explanation / Answer

1)

class Box {
private:
   int width;
   int length;
   int height;
public:
   Box();
   Box(int w, int l, int h);
   int getLength();
   void setLength(int l);
   int volume();
};

Box::Box() {
   width = 0;
   length = 0;
   height = 0;
}

Box::Box(int w, int l, int h) {
   width = w;
   length = l;
   height = h;
}

int Box::getLength() {
   return length;
}

void Box::setLength(int l) {
   length = l;
}

int Box::volume() {
   return length*width*height;
}

2)

Box box1(1, 2, 3); will create a object with width of 1, length of 2 and height of 3

Box box2; will give compilation since there is no default constrcutor in Box class

3)

class ShippingOrder {
private:
   Box box;
   double postage;
public:
   ShippingOrder(Box b, double p) {
       box = b;
       postage = p;
   }
};

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