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Thread: illegal start of expression error!!!!

  1. #1
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    Default illegal start of expression error!!!!

    Hey...this is my code to reverse each word of the string input!!
    At line 12 it says 'illegal start of expression'....any idea how to troubleshoot this ??

    //Reverse each word of the sentence
    import java.io.*;
    class rev_word
    {
    	public static void main (String args[ ])throws IOException
    	{
    		BufferedReader br = new BufferedReader (new InputStreamReader (System.in));
    		String S = br.readLine();
    		S=S+"";int k=0; String word="";
    		for (int i=0; i<S.length();i++)
    		{
    			if (S.charAt(i) == ' ')) // <-- error shown at this line 'illegal start of expression'
    			{
    				word=S.substring (k, i);
    				k= i+1;
    				for (int j=word.length();j>=0;j++)
    				System.out.print (word.charAt(j));
    				System.out.print (" ");
    			}
    		}
    	}
    }
    Last edited by aks.1393; January 13th, 2011 at 01:23 PM.


  2. #2
    Administrator copeg's Avatar
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    Default Re: illegal start of expression error!!!!

    Check the number of parenthesis: see Common java mistakes

  3. The Following User Says Thank You to copeg For This Useful Post:

    aks.1393 (January 14th, 2011)

  4. #3

    Default Re: illegal start of expression error!!!!

    Extra bracket in if condition. It should be:
    if(S.charAt(i)==' ')

  5. The Following 2 Users Say Thank You to worldblackstar For This Useful Post:

    aks.1393 (January 14th, 2011), javapenguin (January 14th, 2011)

  6. #4
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    Default Re: illegal start of expression error!!!!

    ok i removed the extra paranthesis
    and now the code luks somewhat like
    //Reverse each word of the sentence
    import java.io.*;
    class rev_word
    {
        public static void main (String args[ ])throws IOException
        {
            BufferedReader br = new BufferedReader (new InputStreamReader (System.in));
            System.out.println("Enter a String");
            String S = br.readLine();
            S=S+"";int k=0; String word="";
            for (int i=0; i<S.length();i++)
            {
                if (S.charAt(i) == ' ')
                {
                    word=S.substring (k, i);
                    k= i+1;
                    for (int j=word.length();j>=0;j++)
                    System.out.print (word.charAt(j));
                    System.out.print (" ");
                }
            }
        }
    }

    it has compiled but now its giving a runtime error as follows:
    "Enter a String
    I love playing guitar
    Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1
    at java.lang.String.charAt(String.java:686)
    at rev_word.main(abc.java:18)"

  7. #5
    mmm.. coffee JavaPF's Avatar
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    Default Re: illegal start of expression error!!!!

    I believe this issue is caused by problems here:

                    for (int j = word.length(); j >= 0; j++)
                    System.out.print(word.charAt(j));
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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