Question

Design a program that will read each line of text from a file, print it out to the screen in forward and reverse order and determine if it is a palindrome, ignoring case, spaces, and punctuation. (A palindrome is a phrase that reads the same both forwards and backwards.)

Example program run:

A Toyota's a Toyota
atoyoT a s'atoyoT A
This is a palindrome!

Hello World
dlroW olleH
This is NOT a palindrome!

Note:

You are only designing the program at this point.

Submit:

Pseudocode demonstrating your program plan.

Function prototypes with description and pre/post conditions.

Running shell program

Answer 1

Below is the required code snippest:

1. import java.io.*;
2. public class Palindromechecker
3. {
4.                     public static void main (String [] args) throws IOException
5.                     {
6.                                          BufferedReader File = new BufferedReader (new FileReader ("input.txt"));
7.                                          String line;
8.                                          line = File.readLine();
9.                                          String st, another = "y";
10.                                          int left, right;
11.                                          String newSt = "";
12.                                          while(line != null)
13.                                          {
14.                                                              System.out.println(line);
15.                                                              line = File.readLine(); //reads next line
16.                                          }
17.                                          PrintWriter outputFile = new PrintWriter (new FileWriter("output.txt"));
18.                                          outputFile.println("palindrome string ");
19.                                          File.close();
20.                                          outputFile.close();
21.                                          while (another.equalsIgnoreCase("y"))                       {
22.                                                              st = File.readLine();
23.             left = 0;
24.             right = st.length() - 1;
25.         while (st.charAt(left) == st.charAt(right) && left < right)
26.                                          {
27.               left++;
28.               right--;
29.          }
30.          System.out.println();
31.             if (left < right)
32.             System.out.println ("NOT palindrome string");
33.             else
34.             System.out.println ("palindrome string");
35.             System.out.println();
36.             another = File.readLine();
37.                                          }
38.    }
39. }

Thank you.