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Dec 6th, 2006

Word Frequency Counter Help

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I need help making a word frequency counter that also gives percentages of the amount of time the character occured. I am having trouble compiling my program. Thanks.

Java Syntax (Toggle Plain Text)
import java.util.*;
 
public class GoodLetterCounter
 {
   public static void main(String[] args)
   {
 
     System.out.println("\n-This program will show how many times" +
                          " the character showed up in the string.-" );
 
 
      System.out.println("");
 
     Scanner keyboard = new Scanner(System.in);
 
      int charCount = 0;
 
      System.out.print("Please enter a string: ");
      String userString = keyboard.nextLine();
      System.out.print("Please enter a character that was in the string: ");
      char userChar = keyboard.nextLine().charAt(0);
 
 
 
      for(int i= 0;i<userString.length();i++)
      {
              if (userString.charAt(i) == userChar)
                  {
                  charCount++;
                  }
      }
      System.out.println("\nThe character " +"\"" + userChar +
                          "\" appeared " + charCount+ " times." );   
 
      System.out.println("the frequency was" + charCount/userString + "%");           
 
    }
}
import java.util.*;

public class GoodLetterCounter
 {
   public static void main(String[] args)
   {
      
     System.out.println("\n-This program will show how many times" +
                          " the character showed up in the string.-" );
                          
     
      System.out.println("");
     
     Scanner keyboard = new Scanner(System.in);
      
      int charCount = 0;
      
      System.out.print("Please enter a string: ");
      String userString = keyboard.nextLine();
      System.out.print("Please enter a character that was in the string: ");
      char userChar = keyboard.nextLine().charAt(0);
      
      
                     
      for(int i= 0;i<userString.length();i++)
      {
              if (userString.charAt(i) == userChar)
                  {
                  charCount++;
                  }
      }
      System.out.println("\nThe character " +"\"" + userChar +
                          "\" appeared " + charCount+ " times." );   
      
      System.out.println("the frequency was" + charCount/userString + "%");           
                
    }
}

Last edited by the jaguar; Dec 6th, 2006 at 3:59 pm.

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the jaguar

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Dec 6th, 2006

Re: Word Frequency Counter Help

The last line when you try to detemine the percentage, you are dividing a character by a String. You can't do that!

Dukane

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Dec 6th, 2006

Re: Word Frequency Counter Help

You'll also notice that once you fix the bottom line, that you are doing integer division, so the result will be an integer -- either 0 or 1. You need to do floating point division in order to get a percentage. And you also forgot to multiply by 100.

Other than that, I was able to get the program working just fine.

Last edited by Dukane; Dec 6th, 2006 at 4:00 pm. Reason: added to it

Dukane

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Re: Word Frequency Counter Help

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

The last line when you try to detemine the percentage, you are dividing a character by a String. You can't do that!

Is there a way that I can type cast it?

the jaguar

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Dec 6th, 2006

Re: Word Frequency Counter Help

I found a way to fix my previous problem. But now I want to limit the decimal place to 2 places and make a variable for frequency.
Also instead of typing in one character to see its frequency, I want to see all letters occurence and frequencies and the program should stop when the user enters something other than a letter (no white space). Some how I keep getting compiler errors.
Thanks

Java Syntax (Toggle Plain Text)
import java.util.*;
import java.text.*;
 
public class GoodLetterCounter
 {
   public static void main(String[] args)
   {
 
     System.out.println("\n'This program will return how many times" +
                          " the character you entered showed up in" +
                          " the string you entered'.");
 
      System.out.println("");
 
     Scanner keyboard = new Scanner(System.in);
 
      int charCount = 0;
      String userString = new String();
      float frequency = (charCount * 100/(userString.length()));
 
      do
        {
 
 
          System.out.print("Please enter a string: ");
          userString = keyboard.nextLine();
 
 
          System.out.print("Now enter a character from the string: ");
          char userChar = keyboard.nextLine().charAt(0);
 
 
 
          for(int i= 0; i<userString.length();i++)
              {
                  if (userString.charAt(i) == userChar)
                      {
                      charCount++;
                      }
              }
          System.out.println("\nThe character " +"\"" + userChar +
                              "\" appeared " + charCount+ " times." );   
 
          System.out.println("The frequency was " + frequency + "%");           
 
          System.out.println(""); 
 
         } while (userString.length() != 0);
    }
 
}
import java.util.*;
import java.text.*;

public class GoodLetterCounter
 {
   public static void main(String[] args)
   {
      
     System.out.println("\n'This program will return how many times" +
                          " the character you entered showed up in" +
                          " the string you entered'.");
     
      System.out.println("");
     
     Scanner keyboard = new Scanner(System.in);
      
      int charCount = 0;
      String userString = new String();
      float frequency = (charCount * 100/(userString.length()));
      
      do
        {
          
          
          System.out.print("Please enter a string: ");
          userString = keyboard.nextLine();
          
      
          System.out.print("Now enter a character from the string: ");
          char userChar = keyboard.nextLine().charAt(0);
         
          
                         
          for(int i= 0; i<userString.length();i++)
              {
                  if (userString.charAt(i) == userChar)
                      {
                      charCount++;
                      }
              }
          System.out.println("\nThe character " +"\"" + userChar +
                              "\" appeared " + charCount+ " times." );   
          
          System.out.println("The frequency was " + frequency + "%");           
          
          System.out.println(""); 
                              
         } while (userString.length() != 0);
    }
        
}

Last edited by the jaguar; Dec 6th, 2006 at 5:47 pm. Reason: deleting something.

the jaguar

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Dec 6th, 2006

Re: Word Frequency Counter Help

Sorry for the double post. I don't see a delete option.

Last edited by the jaguar; Dec 6th, 2006 at 5:46 pm.

the jaguar

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Dec 6th, 2006

Re: Word Frequency Counter Help

WHAT are the messages you are getting? Chances are it's telling you what the problem is!

Dukane

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Dec 6th, 2006

Re: Word Frequency Counter Help

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

WHAT are the messages you are getting? Chances are it's telling you what the problem is!

The compiler isn't giving me any errors now. But when I execute the program it says Exception in thread "main" java.lang.ArithmeticException: /by zero

the jaguar

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Dec 6th, 2006

Re: Word Frequency Counter Help

Alright, so fix that problem and you should be good to go!

Dukane

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Dec 6th, 2006

Re: Word Frequency Counter Help

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

Alright, so fix that problem and you should be good to go!

I fixed it now, but its not so pretty. Plus I want to see all letters occurence and frequencies. I also the program should stop when the user enters something other than a letter (no white space) or "quit".

Java Syntax (Toggle Plain Text)
import java.util.*;
import java.text.*;
 
public class GoodLetterCounter
 {
   public static void main(String[] args)
   {
 
     System.out.println("\n'This program will return how many times" +
                          " the character you entered showed up in" +
                          " the string you entered'.");
 
      System.out.println("");
 
     //needed for scanner class
      Scanner keyboard = new Scanner(System.in);
 
      double charCount = 0;
      String userString = new String();
 
      do
        {
 
          // get users string
          System.out.print("Please enter a string: ");
          userString = keyboard.nextLine();
 
          // get users character
          System.out.print("Now enter a character from the string: ");
          char userChar = keyboard.nextLine().charAt(0);
          // tell the user what the program does
 
 
          for(int i= 0; i<userString.length();i++)
              {
                  if (userString.charAt(i) == userChar)
                      {
                      charCount++;
                      }
              }
          System.out.println("\nThe character " +"\"" + userChar +
                              "\" appeared " + charCount+ " times." );   
 
          System.out.println("The frequency was " 
                              + charCount * 100/(userString.length()) + "%");           
 
          System.out.println(""); 
 
         } while (userString.length() != 0);
    }
 
}
import java.util.*;
import java.text.*;

public class GoodLetterCounter
 {
   public static void main(String[] args)
   {
      
     System.out.println("\n'This program will return how many times" +
                          " the character you entered showed up in" +
                          " the string you entered'.");
     
      System.out.println("");
     
     //needed for scanner class
      Scanner keyboard = new Scanner(System.in);
      
      double charCount = 0;
      String userString = new String();
            
      do
        {
          
          // get users string
          System.out.print("Please enter a string: ");
          userString = keyboard.nextLine();
          
          // get users character
          System.out.print("Now enter a character from the string: ");
          char userChar = keyboard.nextLine().charAt(0);
          // tell the user what the program does
          
                         
          for(int i= 0; i<userString.length();i++)
              {
                  if (userString.charAt(i) == userChar)
                      {
                      charCount++;
                      }
              }
          System.out.println("\nThe character " +"\"" + userChar +
                              "\" appeared " + charCount+ " times." );   
          
          System.out.println("The frequency was " 
                              + charCount * 100/(userString.length()) + "%");           
          
          System.out.println(""); 
                              
         } while (userString.length() != 0);
    }
        
}

the jaguar

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