Question

(Demonstrate the Box class from above in a program), (Extra 5 Credits ). Re-use your code from the previous question, add the following functions. Each function worth 1 point. You dont have to implement in order.

1) Overloaded cout’s << that displays attributes of a box. Also overload cin’s >> operator to work with this class for constructing a Box instance using values supplied as console inputs.

2) Overloaded == operator as a member function that returns true if two Boxs are equal, returns false otherwise. (Note – two Box objects are equal if the width, length and height of the two are equal to each other. i.e. length1 == length2 ... etc)

3) A member functions that calculates the outside surface area (SA) of the box. (Note - SA = 2*length*width + 2*length * height + 2 * width * height)

4) A member function that returns the volume of a box. (Volume = length*width*height)

5) A member function that returns true if a box is a cube. (Note – length == height == width if a box is also a cube)

Answer 1

Thanks for the question. Below is the code you will be needing. Let me know if you have any doubts or if you need anything to change.

If you are satisfied with the solution, please leave a +ve feedback : ) Let me know for any help with any other questions.

Thank You!
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class Box{
   private:
       double width, length, height;
   public:
       Box();
       Box(double w, double l, double h);
       Box(const Box& b);
      
       void setWidth(double w);
       void setLength(double l);
       void setHeight(double h);
      
       double getWidth() const;
       double getLength() const;
       double getHeight() const;
      
       // PART 2 STARTS HERE
       friend ostream& operator<<(ostream& out, const Box&b);
       friend istream& operator>>(istream& in, Box &b);
       bool operator==(const Box&b1);
       double surfaceArea() const;
       double volume() const;
       bool isCube() const;
};

Box::Box(): width(0), length(0), height(0){
}
Box::Box(double w, double l, double h):
   width(w), length(l), height(h){
}
  
Box::Box(const Box& b){
   width = b.width;
   length = b.length;
   height = b.height;
}

void Box::setWidth(double w){width =w;}
void Box::setLength(double l){length =l;}
void Box::setHeight(double h){height=h;}

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

// IMPLEMENTATION OF PART 2 STARTS HERE
ostream& operator<<(ostream& out, const Box& b){
   out<<"Width = "<<b.getWidth() <<", Length = "<<b.getLength()
       <<", Height = "<<b.getHeight() << endl;
   return out;
}

istream& operator>>(istream& in, Box &b){
   in >> b.width >> b.length >> b.height;
   return in;
}

bool Box::operator==(const Box& b){
   return width ==b.width && length ==b.length && height ==b.height;
}

double Box::surfaceArea() const{return 2*(width*length + length*height + height*width);}
double Box::volume() const{return width*length*height;}
bool Box::isCube() const{return width==length && width ==height;}

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