Question

Project File Processing.

Write a program that will read in from input file one line at a time until end of file and output the number of words in the line and the number of occurrences of each letter. Define a word to be any string of letters that is delimited at each end by either whitespace, a period, a comma or the beginning or end of the line. You can assume that the input consists entirely of letters, whitespaces, commas and periods. When outputting the number of letters that occur in a line, be sure to count upper and lowercase versions of a letter as the same letter. Output the letters in alphabetical order and list only those letters that do occur in the input line. For example, the input line:-I say HI should produce output similar to the following:-

3 words

1 a

1 h

2 i

1 s

1 y

Note: in addition to the above, output the result to file named “result.txt”

Answer 1

JAVA PROGRAM

import java.io.BufferedReader;

import java.io.FileReader;

import java.util.Arrays;

import java.io.File;

import java.io.FileWriter;

import java.io.BufferedWriter;

public class WordLetterCount {

    public static void main(String[] args) {

    // Array of occurence counts

    int countArray[]  = new int[26];

    // Initializing the array with 0's

    Arrays.fill(countArray, 0);

    try {

        // Opening file to read

        BufferedReader br = new BufferedReader(new FileReader("testFile.txt"));

        String line = "";

        FileWriter fw=new FileWriter("results.txt");    

        // Iterating loop till the end of the file

        while((line = br.readLine())!=null) {

            // Splitting lines using whitespace/commas/period as delimiter

            String words[] = line.split("[\\s,.]+");

            // Iterating for each word in the array

            for(int i=0;i<words.length;i++) {

                // Iterating for each letter in each word

                for(int j = 0;j<words[i].length();j++) {

                    // ch : current character in lower case

                    char ch = Character.toLowerCase(words[i].charAt(j));

                    // index : ASCII value of character ch

                    int asciiValue =  (int)ch;

                    //Incrementing occurence count

                    countArray[asciiValue-97]+=1;

                }

            }   

            

            fw.write(words.length+ " words\n");

            // Print number of words in current line

            System.out.println(words.length+ " words");

            // Iterate over countArray and check if value at index i is not 0, means the character was not present in line

            // If yes, print count and corresponding alphabet

            for(int i =0 ;i<26;i++) {

                if(countArray[i]!=0) {

                    System.out.println(countArray[i] +" "+(char)(i+97));

                    fw.write(countArray[i] +" "+(char)(i+97)+"\n");

                }

            }

            System.out.println();

            fw.write("\n");

            // Reset the array to all 0,

            // for keeping count of character of next line

            Arrays.fill(countArray, 0);

        }

        br.close();

        fw.close();

    } catch(Exception e) {

    System.out.println("File doesn't exits!!");

    }

}

}

PROGRAM SCREENSHOT

INPUT FILE: testFile.txt

OUTPUT FILE : results.txt

Note:

# The alphabet occurance is counted using ASCII values. An array of size 26 is made corresponding to each alphabet. Now

asciiValue-97 in array corresponds to the exact alphabet in the count array.

This is done because ASCII value for a-b is 97-122

So , for ch = a, asciiValue = 97

So, countArray[asciiValue-97] = countArray[0], which represents count of character a at position 0