Question

In this lab, you create a programmer-defined class and then use it in a C++ program. The program should create two Rectangle objects and find their area and perimeter.
Instructions
Ensure the class file named Rectangle.cpp is open in your editor.
In the Rectangle class, create two private attributes named length and width. Bothlength and width should be data type double.
Write public set methods to set the values for length and width.
Write public get methods to retrieve the values for length and width.
Write a public calculateArea()method and a public calculatePerimeter() method to calculate and return the area of the rectangle and the perimeter of the rectangle.
Open the file named MyRectangleClassProgram.cpp.
In the MyRectangleClassProgram, create two Rectangle objects named rectangle1 and rectangle2 using the default constructor as you saw in MyEmployeeClassProgram.cpp.
Set the length of rectangle1 to 10.0 and the width to 5.0. Set the length of rectangle2 to 7.0 and the width to 3.0.
Print the value of rectangle1’s perimeter and area, and then print the value of rectangle2’s perimeter and area.
Execute the program by clicking the Run button at the bottom of the screen

Answer 1

The program based on the information given is illustrated below.

What is a program?

A computer program simply means a sequence of instructions in a programming language that is created for a computer to execute.

It should be noted that computer programs are among the component of software.

The program to create two rectangle objects and get their area and perimeter is depicted:

// Rectangle.cpp

using namespace std;

class Rectangle

{

public:

// Declare public methods here

void setLength(double);

void setWidth(double);

double getLength();

double getWidth();

double calculateArea();

double calculatePerimeter();

private:

// Create length and width here

double length, width;

};

void Rectangle::setLength(double len)

{

length = len;

}

void Rectangle::setWidth(double wid)

{

// write setWidth here

width = wid;

}

double Rectangle::getLength()

{

// write getLength here

return length;

}

double Rectangle::getWidth()

{

// write getWidth here

return width;

}

double Rectangle::calculateArea()

{

// write calculateArea here

return length*width;

}

double Rectangle::calculatePerimeter()

{

// write calculatePerimeter here

return 2*(length+width);

}

// This program uses the programmer-defined Rectangle class.

#include "Rectangle.cpp"

#include <iostream>

using namespace std;

int main()

{

Rectangle rectangle1;

Rectangle rectangle2;

rectangle1.setLength(10.0);

rectangle1.setWidth(5.0);

rectangle2.setLength(7.0);

rectangle2.setWidth(3.0);

cout << "Perimeter of rectangle1 is " << rectangle1.calculatePerimeter() << endl;

cout << "Area of rectangle1 is " << rectangle1.calculateArea() << endl;

cout << "Perimeter of rectangle2 is " << rectangle2.calculatePerimeter() << endl;

cout << "Area of rectangle2 is " << rectangle2.calculateArea() << endl;

return 0;

}

/*

output:

The perimeter of rectangle1 is 30

The area of rectangle1 is 50

The Perimeter of rectangle2 is 20

The area of rectangle2 is 21

*/

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