Question

LANGUAGE = JAVA

(IDE Eclipse preferred)

Lab 21

AEIOU Counter

Objective:

Write a program that reads a file and counts the number of times the vowels ‘A’, ‘E’, ‘I’, ‘O’, ‘U’ occurs exactly in that order.

• It ignores consonants
• It ignores any type of space
• It ignores case
• The only thing it cannot ignore is if another vowel occurs out of order
• These count
  • AEIOU
  • aeiou
  • hahehihohu
  • Take it out
• These do not
  • AEIuO
  • Taco is good
  • Take it over
• Files to Test
  • file1.txt
  • file2.txt
  • file3.txt
  • file4.txt

Hints and Tips:

• It may be a good idea to build one long string and use .charAt to examine each loop
• There may be many nested loops

Example Dialog 1:

Enter a file name and I will say how many times AEIOU appears in order

file1.txt

The file file1.txt has "AEIOU" appears in order 7 times

Example Dialog 2:

Enter a file name and I will say how many times AEIOU appears in order

file2.txt

The file file2.txt has "AEIOU" appears in order 1 times

Example Dialog 3:

Enter a file name and I will say how many times AEIOU appears in order

file3.txt

The file file3.txt has "AEIOU" appears in order 0 times

Example Dialog 4:

Enter a file name and I will say how many times AEIOU appears in order

file4.txt

The file file4.txt has "AEIOU" appears in order 209 times

Lab Report Questions:

1. When performing File I/O, what must one use in order to handle the related exceptions?

2. Is it possible to go backwards (or to a previous point) in a file using a Scanner?

Answer 1

import java.util.*;
import java.io.*;

public class Vowels
{
   public static void main(String[] args)
   {
       File file = new File("file1.txt");       /* keep the text file in c drive or else give the full location of the
the file otherwise it will give file not found exception */
       try
       {
       Scanner input = new Scanner(file);
       String content_of_file = "";
       int counter = 0;

       while (input.hasNext())
       {
       content_of_file = content_of_file + input.next() + " ";
       }
       input.close();

       char[] charArr = content_of_file.toCharArray(); /* converting string into character and storing it into an array then it will compare each character with the condition */

       for (char c : charArr)
       {
       if(c == 'a' || c == 'e' ||c == 'i' ||c == 'o' ||c == 'u')
           counter++;
       }

       System.out.println("The file " + file + " has AEIOU in order " + counter + " times \n");

       }

       catch(FileNotFoundException exception)
       {
           System.out.println("Unable to open file '" + file + "'");
       }
       catch(Exception exception)
       {
           System.out.println( "Error reading file '" + file + "'");
       }
   }
}

OutPut :

Q1.  When performing File I/O, what must one use in order to handle the related exceptions?

Ans. While preforming File I/O atleast we should be "FileNotFoundException". And to handel other unknown Exception we can create object of Exception class and catch that exception.

Q2 Is it possible to go backwards (or to a previous point) in a file using a Scanner?

Ans. No it is not possible to backwards or to a previous point because the scanner scans only one time from starting to ending