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Thread: Where the hell is the error coming from. . . ?

  1. #1
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    Default Where the hell is the error coming from. . . ?

    PHP Code:
    import java.util.Scanner;
    public class 
    CharOccurence {
      public static 
    void main(String[] arg){
        
    Scanner input = new Scanner(System.in);
        
        
    System.out.println("Enter a sentence to count the occurence of each letter");
        
    String words=input.nextLine();
        
        
    int[] count letterOccurence(words.toLowerCase());
        
        for(
    int i=0;i<words.length();i++){
          if(
    count[words.charAt(i) - 'a'] == 1)
              
    System.out.println(words.charAt(i)+ " occurence: "count[words.charAt(i) - 'a']+ " time");
          else
              
    System.out.println(words.charAt(i)+ " occurence: "count[words.charAt(i) - 'a']+ " times");
        }
        
        
     }
        
        
        public static 
    int[] letterOccurence(String sentence){
            
    int[] count = new int[26];
            
            for(
    int i=0;i<sentence.length();i++){
                if(
    Character.isLetter(sentence.charAt(i)))
                    
    count[sentence.charAt(i) - 'a']++;
            }
            
          return 
    count;
        }
     

    Last edited by Yunus Einsteinium; July 13th, 2012 at 11:17 AM.


  2. #2
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    Default Re: Where the hell is the error coming from. . . ?

    man, Einsteinium, you commit a basic error and wonder why you're killed the poison is
    int[] count = letterOccurence(words.toLowerCase());
    for(int i=0;i<words.length();i++){
    ..
    }
    to detox
    int[] count = letterOccurence(words.toLowerCase());
    for(int i=0;i<count.length;i++){
    ..
    }

  3. #3
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    Default Re: Where the hell is the error coming from. . . ?

    man, when i do that another error pops out instructing me to change it back to length()

  4. #4
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    Default Re: Where the hell is the error coming from. . . ?

    Quote Originally Posted by Yunus Einsteinium View Post
    PHP Code:
    import java.util.Scanner;
    public class 
    CharOccurence {
      public static 
    void main(String[] arg){
        
    Scanner input = new Scanner(System.in);
        
        
    System.out.println("Enter a sentence to count the occurence of each letter");
        
    String words=input.nextLine();
        
        
    int[] count letterOccurence(words.toLowerCase());
        
        for(
    int i=0;i<words.length();i++){
          if(
    count[words.charAt(i) - 'a'] == 1)
              
    System.out.println(words.charAt(i)+ " occurence: "count[words.charAt(i) - 'a']+ " time");
          else
              
    System.out.println(words.charAt(i)+ " occurence: "count[words.charAt(i) - 'a']+ " times");
        }
        
        
     }
        
        
        public static 
    int[] letterOccurence(String sentence){
            
    int[] count = new int[26];
            
            for(
    int i=0;i<sentence.length();i++){
                if(
    Character.isLetter(sentence.charAt(i)))
                    
    count[sentence.charAt(i) - 'a']++;
            }
            
          return 
    count;
        }
     

    Hello Yunus Einsteinium!
    For future posts, it would help if you explained what are you trying to do with your code and posted the full error messages and the code that produces them.
    I tried your code and it causes an ArrayIndexOutOfBoundsException. This happens when you enter a sentence that has characters which are NOT letters.
    You can avoid that by checking every character (in the for loop) and see whether it is a letter or not.
    Hope this helps.

  5. The Following User Says Thank You to andreas90 For This Useful Post:

    Yunus Einsteinium (July 13th, 2012)

  6. #5
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    Default Re: Where the hell is the error coming from. . . ?

    Einsteinium, your 2nd poison vial is:
     
            for(int i=0;i<sentence.length();i++){
                if(Character.isLetter(sentence.charAt(i)))
                    count[sentence.charAt(i) - 'a']++;
            }
    Where? the term sentence.charAt(i) - 'a' can be bigger than 26 or a negative value if sentence.charAt(i) is an uppercase character A, B,...
    to detox:

            String tmp = sentence.toLowerCase();
            for(int i=0;i<sentence.length();i++){
                if(Character.isLetter(sentence.charAt(i)))
                    count[tmp.charAt(i) - 'a']++;
            }

  7. #6
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    Default Re: Where the hell is the error coming from. . . ?

    and the 3rd poison bottle you have is:
     
                Scanner input = new Scanner(System.in);
     
                System.out.println("Enter a sentence to count the occurence of each letter");
                String words=input.nextLine();
    	    int[] count = letterOccurence(words.toLowerCase());
     
    	    for(int i=0;i<count.length;i++){
    	      if(count[words.charAt(i) - 'a'] == 1)
    		  System.out.println(words.charAt(i)+ " occurence: "+ count[words.charAt(i) - 'a']+ " time");
    	      else
    		  System.out.println(words.charAt(i)+ " occurence: "+ count[words.charAt(i) - 'a']+ " times");
    	    }
    What happens if words == null ?
    to detox
     
        Scanner input = new Scanner(System.in);
     
        System.out.println("Enter a sentence to count the occurence of each letter");
        String words=input.nextLine();
        if (words != null) {
    	    int[] count = letterOccurence(words.toLowerCase());
     
    	    for(int i=0;i<count.length;i++){
    	      if(count[words.charAt(i) - 'a'] == 1)
    		  System.out.println(words.charAt(i)+ " occurence: "+ count[words.charAt(i) - 'a']+ " time");
    	      else
    		  System.out.println(words.charAt(i)+ " occurence: "+ count[words.charAt(i) - 'a']+ " times");
    	    }
     
        }

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