Question

C++

This chapter uses the class rectangleType to illustrate how to overload the operators +, *, ==, !=, >>, and <<. In this exercise, first redefine the class rectangleType by declaring the instance variables as protected and then overload additional operators as defined in parts 1 to 3.

1. Overload the pre- and post-increment and decrement operators to increment and decrement, respectively, the length and width of a rectangle by one unit. (Note that after decrementing the length and width, they must be positive.)

2. Overload the binary operator – to subtract the dimensions of one rectangle from the corresponding dimensions of another rectangle. If the resulting dimensions are not positive, output an appropriate message and do not perform the operation.

3. The operators == and != are overloaded by considering the lengths and widths of rectangles. Redefine the functions to overload the relational operator by considering the areas of rectangles as follows: Two rectangles are the same, if they have the same area; otherwise, the rectangles are not the same. Similarly, rectangle yard1 is greater than rectangle yard2 if the area of yard1 is greater than the area of yard2. Overload the remaining relational operators using similar definitions.

4. Write the definitions of the functions to overload the operators defined in steps 1 through 3.

5. Write a test program that tests various operations on the class rectangleType.

6. (need to have 3 files !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! main.cpp rectanglType.cpp and rectangleType.h ))))))))) C++

Answer 1

I hope this might solve your problem, try to understand, it's pretty easy,

main.cpp

//In my main.cpp file
#include <iostream>
#include "rectangleType.h"

using namespace std;

// part e
int main()
{
rectangleType rectangle1(10, 5);
rectangleType rectangle2(8, 7);
rectangleType rectangle3;
rectangleType rectangle4;

cout << "rectangle1: " << rectangle1 << endl;

cout << "rectangle2: " << rectangle2 << endl;

rectangle3 = rectangle1 + rectangle2;

cout << "rectangle3: " << rectangle3 << endl;

rectangle4 = rectangle1 * rectangle2;

cout << "rectangle4: " << rectangle4 << endl;

if (rectangle1 > rectangle2)
cout << "Area of rectangle1 is greater than the area "
<< "of rectangle2 ." << endl;
else
cout << "Area of rectangle1 is less than or equal to the area "
<< "of rectangle2 ." << endl;

   rectangle1++;

   cout << "After increment the length and width of "
       << "rectangle1 by one unit, \nrectangle1: "
<< rectangle1 << endl;

   rectangle4 = ++rectangle3;

   cout << "New dimension of rectangle3: " << rectangle3 << endl;
   cout << "New dimension of rectangle4: " << rectangle4 << endl;

return 0;
}

rectangleType.cpp

//In my rectangleType.cpp file
#include <iostream>
#include <cassert>

#include "rectangleType.h"

using namespace std;

void rectangleType::setDimension(double l, double w)
{
if (l >= 0)
length = l;
else
length = 0;

if (w >= 0)
width = w;
else
width = 0;
}

double rectangleType::getLength() const
{
return length;
}

double rectangleType::getWidth()const
{
return width;
}

double rectangleType::area() const
{
return length * width;
}

double rectangleType::perimeter() const
{
return 2 * (length + width);
}

rectangleType::rectangleType(double l, double w)
{
setDimension(l, w);
}

rectangleType::rectangleType()
{
length = 0;
width = 0;
}

rectangleType rectangleType::operator++()
{
// part d
}

rectangleType rectangleType::operator++(int u)
{
// part d
}

rectangleType rectangleType::operator--()
{
// part d
}

rectangleType rectangleType::operator--(int u)
{
// part d
}

rectangleType rectangleType::operator+
(const rectangleType& rectangle) const
{
// part d
}

rectangleType rectangleType::operator-
(const rectangleType& rectangle) const
{
// part d
}

rectangleType rectangleType::operator*(const rectangleType& rectangle) const
{
// part d
}

bool rectangleType::operator==
(const rectangleType& rectangle) const
{
// part d
}

bool rectangleType::operator!=
(const rectangleType& rectangle) const
{
// part d
}

bool rectangleType::operator<=
(const rectangleType& rectangle) const
{
// part d
}

bool rectangleType::operator<
(const rectangleType& rectangle) const
{
// part d
}

bool rectangleType::operator>=
(const rectangleType& rectangle) const
{
// part d
}

bool rectangleType::operator>
(const rectangleType& rectangle) const
{
// part d
}

ostream& operator<<(ostream& osObject,
const rectangleType& rectangle)
{
osObject << "Length = " << rectangle.length
<< "; Width = " << rectangle.width;

return osObject;
}

istream& operator>>(istream& isObject, rectangleType& rectangle)
{
isObject >> rectangle.length >> rectangle.width;

return isObject;
}

rectangleType.h

//In my rectangleType.h file
#ifndef H_rectangleType
#define H_rectangleType

#include <iostream>
using namespace std;

class rectangleType
{
//Overload the stream insertion and extraction operators
friend ostream& operator<<(ostream&, const rectangleType &);
friend istream& operator>>(istream&, rectangleType &);

public:
void setDimension(double l, double w);
double getLength() const;
double getWidth() const;
double area() const;
double perimeter() const;

//Overload the arithmetic operators (part b)
rectangleType operator + (const rectangleType &) const;
rectangleType operator - (const rectangleType &) const;
rectangleType operator * (const rectangleType&) const;

//Overload the increment and decrement operators (part a)
rectangleType operator ++ (); //pre-increment
rectangleType operator ++ (int); //post-increment
rectangleType operator -- (); //pre-decrement
rectangleType operator -- (int); //post-decrement

//Overload the relational operators (part c)
bool operator == (const rectangleType&) const;
bool operator != (const rectangleType&) const;
bool operator <= (const rectangleType&) const;
bool operator < (const rectangleType&) const;
bool operator >= (const rectangleType&) const;
bool operator > (const rectangleType&) const;

//constructors
rectangleType();
rectangleType(double l, double w);

protected:
double length;
double width;
};

#endif