Ascending Circles Program 8-28 from Chapter 8 creates an array of four Circle ob...

Ascending Circles

Program 8-28 from Chapter 8 creates an array of four Circle objects, then displays the area of each object. Using a copy of that program as a starting point, modify it to create an array of eight Circle objects initialized with the following radii: 2.5, 4.0, 1.0, 3.0, 6.0, 5.5, 3.5, 2.0. Then use a bubble sort to arrange the objects in ascending order of radius size before displaying the area of each object.

Program 8-28:

1 // This program uses an array of objects.

2 // The objects are instances of the Circle class.

3 #include <iostream>

4 #include <iomanip>

5 #include "Circle.h" // Circle class declaration file

6 using namespace std;

7

8 const int NUM_CIRCLES = 4;

9

10 int main()

11 {

12 Circle circle[NUM_CIRCLES]; // Define an array of Circle objects

13

14 // Use a loop to initialize the radius of each object

15 for (int index = 0; index < NUM_CIRCLES; index++)

16 { double r;

17 cout << "Enter the radius for circle " << (index+1) << ": ";

18 cin >> r;

19 circle[index].setRadius(r);

20 }

21

22 // Use a loop to get and print out the area of each object

23 cout << fixed << showpoint << setprecision(2);

24 cout << "\nHere are the areas of the " << NUM_CIRCLES

25 << " circles.\n";

26 for (int index = 0; index < NUM_CIRCLES; index++)

27 { cout << "circle " << (index+1) << setw(8)

28 << circle[index].findArea() << endl;

29 }

30 return 0;

31 }

Program Output with Example Input Shown in Bold

Enter the radius for circle 1: 0[Enter]

Enter the radius for circle 2: 2[Enter]

Enter the radius for circle 3: 2.5[Enter]

Enter the radius for circle 4: 10[Enter]

Here are the areas of the 4 circles.

circle 1 0.00

circle 2 12.56

circle 3 19.63

circle 4 314.00