14 The area of a circle is calculated using the formula ni x 12 where it is equal to 3.142 and r is the
radius.
A program is written to allow a user to enter the radius of a circle as a whole number between
1 and 30, then calculate and output the area of the circle.
01 radius = 0
02 area = 0.0
03 radius = input("Enter radius")
04 if radius <1 OR radius > 30 then
05 print("Sorry, that radius is invalid")
06 else
07 area = 3.142* (radius ^2)
08 print (area
09 endir
(a) Explain, using examples from the program, two ways to improve the maintainability of the
program. De
(4 Points)

This question involves a class named textfile that represents a text file. public class textfile { private string filename; private string filename; private arraylist words; // constructors not shown // postcondition: returns the number of bytes in this file public int filesize() { } // precondition: 0 < = index < words.size() // postcondition: removes numwords words from the words arraylist beginning at // index. public void deletewords(int index, int numwords) { } // precondition: 0 < = index < = words.size() // postcondition: adds elements from newwords array to words arraylist beginning // at index. pub lic voidaddwords(int index, string[] newwords) { } // other methods not shown } complete the filesize() method. the filesize() is computed in bytes. in a text file, each character in each word counts as one byte. in addition, there is a space in between each word in the words arraylist, and each of those spaces also counts as one byte. for example, suppose the words arraylist stores the following words: { mary had a little lamb; its fleece was white as snow. } the filesize() method would compute 4 + 3 + 1 + 6 + 5 + 4 + 6 + 3 + 5 + 2 + 5 as the sum of the lengths of each string in the arraylist. the value returned would be this sum plus 10, because there would also be 10 spaces in between the 11 words. complete the filesize() method below: // postcondition: returns the number of bytes in this file public int filesize() { }