Answer to Question #174245 in C++ for Geeta Deshlahre

Question

Create a class Box containing length, breath and height. Include following methods in it:

a) Calculate surface Area

b) Calculate Volume

c) Increment, Overload ++ operator (both prefix & postfix)

d) Decrement, Overload -- operator (both prefix & postfix)

e) Overload operator == (to check equality of two boxes), as a friend function

f) Overload Assignment operator

g) Check if it is a Cube or cuboid

Write a program which takes input from the user for length, breath and height to test the

above class.

Answer 1

#include <iostream>


using namespace std;


class Box {


private:
	float length;
	float breath;
	float height;
public:
	//Constructor
	Box(): length(0),breath(0),height(0) {  }
	//Constructor
	Box(float length,float breath,float height){
		this->length=length;
		this->breath=breath;
		this->height=height;
	}
	//Calculate surface Area
	float calculateSurfaceArea(){
		return 2*length*breath+2*length*height+2*length*breath;
	}
	//Calculate Volume
	float calculateVolume(){
		return 0;
	}


	// prefix increment
	Box operator ++(){
        Box temp;
        temp.length = ++length;
		temp.breath = ++breath;
		temp.height = ++height;
        return temp;
    }
	//postfix
	Box operator ++ (int){
        Box temp;
		temp.length=length++;
		temp.breath=breath++;
		temp.height=height++;
		return temp;
    }
	Box operator --(){
        Box temp;
        temp.length = --length;
		temp.breath = --breath;
		temp.height = --height;
        return temp;
    }
	//postfix
	Box operator - (int){
        Box temp;
		temp.length=length--;
		temp.breath=breath--;
		temp.height=height--;
		return temp;
    }
	
	friend bool operator == (Box ob1, Box ob2){
		return (ob1.length==ob2.length) && (ob1.breath==ob2.breath) && (ob1.height==ob2.height);
	}
	Box& operator= (const Box &box){
		this->length=box.length;
		this->breath=box.breath;
		this->height=box.height;
		return *this;
	}
	bool isCube(){
		return (this->length==this->breath) && (this->breath==this->height);
	}
	//void display info about box
	void display(){
		cout<<"The length: "<<this->length<<"\n";
		cout<<"The breath: "<<this->breath<<"\n";
		cout<<"The height: "<<this->height<<"\n";
	}
};


//The start point of the program
int main (){
	Box box(10,10,10);
	float length;
	float breath;
	float height;
	// input from the user for length, breath and height to test the above class.
	cout<<"Enter the length: ";
	cin>>length;
	cout<<"Enter the breath: ";
	cin>>breath;
	cout<<"Enter the height: ";
	cin>>height;
	Box userBox(length,breath,height);
	cout<<"\nbox:\n";
	box.display();
	cout<<"\n++box:\n";
	++box;
	box.display();
	userBox++;
	cout<<"\nuserBox++:\n";
	userBox.display();
	cout<<"\n";
	if(userBox==box){
		cout<<"The boxes are equal.\n";
	}else{
		cout<<"The boxes are not equal.\n";
	}
	cout<<"\nuserBox\n";
	if(userBox.isCube()){
		cout<<"The box is cube.\n";
	}else{
		cout<<"The box is cuboid.\n";
	}
	cout<<"\nuserBox=box\n";
	userBox=box;
	cout<<"userBox\n";
	userBox.display();
	//delay
	system("pause");
	return 0;
}