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Aug 30th, 2008

word/line/character count in files

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i did a codig to find the no. of words,no. of characters and no. of lines in a file i was not getting the output, can anyone help me

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import java.io.*;
public class countCharacters  
{
    public  void Lines()throws IOException
    {
        File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        String str = br.readLine();
                        
            LineNumberReader ln = new LineNumberReader(br);
            int count = 0;
            while (ln.readLine()!=null)
            {
                count++;
            }
            
            System.out.println("no. of lines in the file = " + count);
         
        }
         public  void Words()throws IOException
            // count no. of words.
         {
             File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
             int index = 0;
            int numWords =0;
            boolean prevwhitespace = true;
                    String line = br.readLine();
            while(index < line.length())
            {
                char c = line.charAt(index++);
                boolean currwhitespace = Character.isWhitespace(c);
                if(prevwhitespace && !currwhitespace)
                {
                    numWords++;
                }
                prevwhitespace= currwhitespace;
            }
                    
                   System.out.println("no. of words in file" +numWords);
        }
         public  void Charact()throws IOException
                 // counting characters
         {
             File f = new File("in.dat");
             FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
               long numChar = f.length();
               int countChar =0;
               while(numChar !=-1)
               {
                   countChar++;
               }
               System.out.println("no. of characters in the file =" + countChar);
              //  return countChar;  
                
    }
         public static void main(String args[])throws IOException
     {
         countCharacters ob1 = new countCharacters();
           ob1.Charact();
           ob1.Words();
           ob1.Lines();
        
     }
}

import java.io.*;
public class countCharacters  
{
    public  void Lines()throws IOException
    {
        File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        String str = br.readLine();
                        
            LineNumberReader ln = new LineNumberReader(br);
            int count = 0;
            while (ln.readLine()!=null)
            {
                count++;
            }
            
            System.out.println("no. of lines in the file = " + count);
         
        }
         public  void Words()throws IOException
            // count no. of words.
         {
             File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
             int index = 0;
            int numWords =0;
            boolean prevwhitespace = true;
                    String line = br.readLine();
            while(index < line.length())
            {
                char c = line.charAt(index++);
                boolean currwhitespace = Character.isWhitespace(c);
                if(prevwhitespace && !currwhitespace)
                {
                    numWords++;
                }
                prevwhitespace= currwhitespace;
            }
                    
                   System.out.println("no. of words in file" +numWords);
        }
         public  void Charact()throws IOException
                 // counting characters
         {
             File f = new File("in.dat");
             FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
               long numChar = f.length();
               int countChar =0;
               while(numChar !=-1)
               {
                   countChar++;
               }
               System.out.println("no. of characters in the file =" + countChar);
              //  return countChar;  
                
    }
         public static void main(String args[])throws IOException
     {
         countCharacters ob1 = new countCharacters();
           ob1.Charact();
           ob1.Words();
           ob1.Lines();
        
     }
}

the file input.dat is
$<br /> java programming for internet<br /> javascript for web page development<br /> pearl for server side scripting$

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newtechie

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Aug 30th, 2008

Re: word/line/character count in files

The problem is that your Charact method is stuck in the while loop. You obtain the length of the file and state the conditon numChar != -1.

Keep in mind what data types are for. They store a copy of the data they accept.

Here you're calling f.length() and placing it in numChar (once). Though I'm not very savvy on files, from what I understand you are only storing the file's (current) length once in numChar which means that your while loop will either never execute or execute infinitely since numChar != -1 will be true or false and in your while loop you are not manipulating or changing the data stored in numChar to cause an escape from the loop... therefore an infinite loop.

java Syntax (Toggle Plain Text)
               long numChar = f.length();
               int countChar =0;
               while(numChar !=-1) // condition - will evaluate to true so long as numChar isn't -1
               {
                   countChar++; // countChar changes, but numChar doesnt ^
               }
               long numChar = f.length();
               int countChar =0;
               while(numChar !=-1) // condition - will evaluate to true so long as numChar isn't -1
               {
                   countChar++; // countChar changes, but numChar doesnt ^
               }

I made this change and it seemed to work, though I'm not entirely sure it's what you wanted to do--

java Syntax (Toggle Plain Text)
		while(countChar < f.length()){
			countChar++;
			System.out.println("CharactWhileLoop");
		}
		while(countChar < f.length()){
			countChar++;
			System.out.println("CharactWhileLoop");
		}

Alex Edwards

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Sep 1st, 2008

Re: word/line/character count in files

thanks alex edwards the character part is working along with no. of lines but the no. of words seems to give a wrong output.
can you guide me in that
thanks in advance

Last edited by newtechie; Sep 1st, 2008 at 1:29 pm. Reason: spelling

newtechie

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Sep 1st, 2008

Re: word/line/character count in files

Click to Expand / Collapse Quote originally posted by newtechie ...

thanks alex edwards the character part is working along with no. of lines but the no. of words seems to give a wrong output.
can you guide me in that
thanks in advance

Personally I'd read all of the characters into a String then tokenize the String based on the space character.

Alex Edwards

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Sep 2nd, 2008

Re: word/line/character count in files

i modified the count word part and got the desired output

java Syntax (Toggle Plain Text)
/*
 pgm to count the characters in a file,no. of lines in a file and no. of words
 */
import java.io.*;
public class countCharacters  
{
    public  void Lines()throws IOException
    {
        File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        String str = br.readLine();
 
            LineNumberReader ln = new LineNumberReader(br);
            int count = 0;
            while (ln.readLine()!=null)
            {
                count++;
            }
 
            System.out.println("no. of lines in the file = " + count);
 
        }
         public  void Words()throws IOException 
                 // count no. of words.
         {
             File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        StreamTokenizer stz = new StreamTokenizer(br);
             int index = 0;
            int numWords =0;
 
            while(index !=StreamTokenizer.TT_EOF )
            {
                index =stz.nextToken();
                numWords++;
            }
 
                   System.out.println("no. of words in file = " + numWords);
        }
         public  void Charact()throws IOException
                 // counting characters
         {
             File f = new File("in.dat");
             FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
               long numChar = f.length();
               int countChar =0;
               while(countChar<numChar)
               {
                   countChar++;
               }
               System.out.println("no. of characters in the file =" + countChar);
              //  return countChar;  
 
    }
         public static void main(String args[])throws IOException
     {
         countCharacters ob1 = new countCharacters();
           ob1.Charact();
           ob1.Words();
           ob1.Lines();
 
     }
}
/*
 pgm to count the characters in a file,no. of lines in a file and no. of words
 */
import java.io.*;
public class countCharacters  
{
    public  void Lines()throws IOException
    {
        File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        String str = br.readLine();
                        
            LineNumberReader ln = new LineNumberReader(br);
            int count = 0;
            while (ln.readLine()!=null)
            {
                count++;
            }
            
            System.out.println("no. of lines in the file = " + count);
         
        }
         public  void Words()throws IOException 
                 // count no. of words.
         {
             File f = new File("in.dat");
        FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
        StreamTokenizer stz = new StreamTokenizer(br);
             int index = 0;
            int numWords =0;
            
            while(index !=StreamTokenizer.TT_EOF )
            {
                index =stz.nextToken();
                numWords++;
            }
                    
                   System.out.println("no. of words in file = " + numWords);
        }
         public  void Charact()throws IOException
                 // counting characters
         {
             File f = new File("in.dat");
             FileReader fr = new FileReader(f);
        BufferedReader br = new BufferedReader(fr);
               long numChar = f.length();
               int countChar =0;
               while(countChar<numChar)
               {
                   countChar++;
               }
               System.out.println("no. of characters in the file =" + countChar);
              //  return countChar;  
                
    }
         public static void main(String args[])throws IOException
     {
         countCharacters ob1 = new countCharacters();
           ob1.Charact();
           ob1.Words();
           ob1.Lines();
        
     }
}

Last edited by cscgal; Sep 2nd, 2008 at 10:49 pm. Reason: Fixed code tags

newtechie

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