Question

I have figured out this assignment, but I am having a hard time figuring out the extra credit, Thanks!

Creating a Rectangle class

We have created a representation of a rectangle in C++ and extended it to create multiple representation's of rectangles. Classes can simplify that process considerably. In this assignment, your task is to convert the representation of a rectangle we created earlier in the semester to a Rectangle class. The Rectangle class shall consist of the following:

1. The private data shall consist of 4 members:
   1. length
   2. width
   3. area
   4. perimeter
2. Have 1 constructor with the following parameters: length and width.
3. Have 2 mutators:
   1. setLength to set/modify the length.
   2. setWidth to set/modify the width.
4. Have 5 accessors:
   1. getLength to return the length.
   2. getWidth to return the width.
   3. getPerimeter to return the perimeter.
   4. getArea to return the area.
   5. printObjet to print the representation of the rectangle (using the same output criteria of the previous incarnations). NOTE: This routine must print out the following: "You created a rectangle with the following characteristics:" followed by a blank line before printing out the values of the class data.

You then need to create a 'main' program and instantiate 3 rectangle objects with different parameters. You also need to print each rectangle's characteristics.

For this assignment you need to turn in 1 file which contains the class header and declaration/implementation, and the main program. Don't forget to include your file header.

Expected Output:

Your output shall look like this given the inputs below:

Enter the length of the 1st rectangle: 3
Enter the width of the 1st rectangle: 5
You created a rectangle with the following characteristics:

    width = 5
    length = 3
    perimeter = 16
    area = 15

Enter the length of the 2nd rectangle: 4
Enter the width of the 2nd rectangle: 6
You created a rectangle with the following characteristics:

    width = 6
    length = 4
    perimeter = 20
    area = 24

Enter the length of the 3rd rectangle: 4.1
Enter the width of the 3rd rectangle: 6.2
You created a rectangle with the following characteristics:

    width = 6.2000
    length = 4.1000
    perimeter = 20.6000
    area = 25.4200

EXTRA CREDIT

For 7 points of extra credit:

Store 10 rectangle objects you created in a vector and sequence through the vector to print out the 10 rectangle objects.

Answer 1

Screenshot

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Program

rectangle.h

//Create a class rectangle
class Rectangle {
   //Instance variables
private:
   double length;
   double width;
   double perimeter;
   double area;
   //Member functions
public:
   //Constructor
   Rectangle(double len, double wid);
   //Mutators
   void setLength(double len);
   void setWidth(double wid);
   //Accessors
   double getLength();
   double getWidth();
   double getArea();
   double getPerimeter();
   //Print object details
   void print();
};

rectangle.cpp

#include "rectangle.h"
#include<iostream>
#include<iomanip>
using namespace std;
   //Constructor
   Rectangle::Rectangle(double len, double wid) {
       length = len;
       width = wid;
   }
   //Mutators
   void Rectangle::setLength(double len) {
       length = len;
   }
   void Rectangle::setWidth(double wid) {
       width = wid;
   }
   //Accessors
   double Rectangle::getLength() {
       return length;
   }
   double Rectangle::getWidth() {
       return width;
   }
   double Rectangle::getArea() {
       area = (length*width);
       return area;
   }
   double Rectangle::getPerimeter() {
       perimeter = (2 * (length + width));
       return perimeter;
   }
   //Print object details
   void Rectangle::print() {
       cout <<setprecision(4);
       cout << "\n\nwidth=" << width << "\nlength=" << length << "\nperimeter=" << getPerimeter();
       cout << "\narea=" << getArea() << endl << endl;
   }

main.cpp

#include <iostream>
#include<vector>
#include"rectangle.h"
using namespace std;

int main()
{
   //Variables for input read
   double l, w;
    /*//Create 3 objects of rectangle
   for (int i = 0; i < 3; i++) {
       cout << "Enter the length of the " << (i + 1) << "th rectangle : ";
       cin >> l;
       cout << "Enter the width of the "<<(i+1)<<"th rectangle : ";
       cin >> w;
       cout << "You created a rectangle with the following characteristics : ";
       Rectangle rect(l, w);
       rect.print();
   }*/
   //Create vector to store object
   vector<Rectangle> rectangles;
   for (int i = 0; i < 10; i++) {
       cout << "Enter the length of the " << (i + 1) << "th rectangle : ";
       cin >> l;
       cout << "Enter the width of the "<<(i+1)<<"th rectangle : ";
       cin >> w;
       Rectangle rect(l, w);
       rectangles.push_back(rect);
   }
   //Print vector
   for (int i = 0; i < 10; i++) {
       cout << "You created a rectangle with the following characteristics : ";
       rectangles.at(i).print();
   }
}

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Output

Enter the length of the 1th rectangle : 1
Enter the width of the 1th rectangle : 2
Enter the length of the 2th rectangle : 2
Enter the width of the 2th rectangle : 3
Enter the length of the 3th rectangle : 3
Enter the width of the 3th rectangle : 4
Enter the length of the 4th rectangle : 4
Enter the width of the 4th rectangle : 5
Enter the length of the 5th rectangle : 5
Enter the width of the 5th rectangle : 6
Enter the length of the 6th rectangle : 6
Enter the width of the 6th rectangle : 7
Enter the length of the 7th rectangle : 7
Enter the width of the 7th rectangle : 8
Enter the length of the 8th rectangle : 8
Enter the width of the 8th rectangle : 9
Enter the length of the 9th rectangle : 9
Enter the width of the 9th rectangle : 10
Enter the length of the 10th rectangle : 10
Enter the width of the 10th rectangle : 11
You created a rectangle with the following characteristics :

width=2
length=1
perimeter=6
area=2

You created a rectangle with the following characteristics :

width=3
length=2
perimeter=10
area=6

You created a rectangle with the following characteristics :

width=4
length=3
perimeter=14
area=12

You created a rectangle with the following characteristics :

width=5
length=4
perimeter=18
area=20

You created a rectangle with the following characteristics :

width=6
length=5
perimeter=22
area=30

You created a rectangle with the following characteristics :

width=7
length=6
perimeter=26
area=42

You created a rectangle with the following characteristics :

width=8
length=7
perimeter=30
area=56

You created a rectangle with the following characteristics :

width=9
length=8
perimeter=34
area=72

You created a rectangle with the following characteristics :

width=10
length=9
perimeter=38
area=90

You created a rectangle with the following characteristics :

width=11
length=10
perimeter=42
area=110