Question

string tokens

Asked by: shragi

I need to get tokens separetly...for expression...

4/12 - 2/8

I need 4 separetly / separetly - separetly .... how to do it..

next time i may have

4/12 * 8/2

or 4/12 + 8/2

I can do this if I am able to divide each one as separate token..

let me know how to do it..

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Asked On
2009-11-04 at 12:38:11ID24872373
Tags

token

Topics

New to Java Programming

,

Java Programming Language

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Java Standard Edition

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    Answers

     

    by: objectsPosted on 2009-11-04 at 12:46:24ID: 25743712

    you can use split(), eg.

    String[] tokens = s.split("[/ ]");

     

    by: shragiPosted on 2009-11-04 at 13:10:01ID: 25743980

    first of all I will give ... expression like

    4/12 - 3/9

    or I can give

    4/12 + 3/9

    so I don't know how to split i.e., split using + or -
    split("[+]") or split("[-]");

     

    by: objectsPosted on 2009-11-04 at 13:21:48ID: 25744077

    to split on either us

    split("[+-]")

     

    by: shragiPosted on 2009-11-04 at 13:22:33ID: 25744085

    I have an idea....

    but let me know how to do it...

    in each expression...

    a space is there after each fraction...

    so split using space

    index = split(" "); // is this correct

    fraction1 = str.substring(0, index+1)
    operator = str.substring(index+1, index+2);
    fraction2 = str.substring(index+2, str.length);

    but it went wrong some where...

     

    by: shragiPosted on 2009-11-04 at 13:23:36ID: 25744094

    @objects:

    good one ...but a little bit more clear... plz...then what we store in token array....i mean how we store...

     

    by: CEHJPosted on 2009-11-04 at 13:23:43ID: 25744095

    You'd be better off using an expression parser:

    http://sourceforge.net/projects/jep/

     

    by: objectsPosted on 2009-11-04 at 13:27:22ID: 25744131

    > good one ...but a little bit more clear... plz...then what we store in token array....i mean how we store...

    that why you wouldn't split on the + and -, as you want the tokens

    you can also use something like StreamTokenizer
    or even jep lite if you want to get more spophisticated

     

    by: objectsPosted on 2009-11-04 at 13:29:50ID: 25744152

    you can split on space

    String[] tokens = s.split(" ");

    Then split the numbers on /, eg.

    String[] number = tokens[0].split("/");

     

    by: CEHJPosted on 2009-11-04 at 13:39:57ID: 25744242

    If you must use regex, split is not actually appropriate. You need something more like the following. Put it inside your main and for

    java X '4/12 - 2/8 '

    you'll get

    4
    /
    12
    -
    2
    /
    8

    	final String RE_MATH = "(\\d+)|([^ ])";
	Pattern p = Pattern.compile(RE_MATH);
	Matcher m = p.matcher(args[0]);
	while(m.find()) {
	    System.out.println(m.group());
	}
                                              
    1:
2:
3:
4:
5:
6:

    Select allOpen in new window

     

    by: shragiPosted on 2009-11-04 at 13:40:01ID: 25744245

    check this one....

    I am getting error as
    "cannot find symbol "
    symbol : strl


     Scanner s = new Scanner(System.in);
             String str1=s.nextLine();
          String[] tokens = strl.split("[+,-]");
           String[] fraction1 = tokens[0].split("/");
                          String num1 = fraction1[0];
          String deno1 = fraction1[1];
              System.out.println( "Numerator is:" + num1) ;
            System.out.println( "Denominator is:" +deno1);

     

    by: shragiPosted on 2009-11-04 at 13:48:48ID: 25744325

    I resolved the error... now how to get the operator that i used to split...

    String[] tokens = strl.split("[+,-]");


    here how to get that operator ... that is used to split....

    it may be + or - any thing...

     

    by: CEHJPosted on 2009-11-04 at 13:51:05ID: 25744340

    >>System.out.println(m.group());

    (Of course you can store the operators and operands in an array instead of printing them)

     

    by: objectsPosted on 2009-11-04 at 13:51:43ID: 25744346

    don't split on operator, instead split on whitespace as I suggested above

    20120131-EE-VQP-002

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