Results 1 to 5 of 5

Thread: Postfix this!!

  1. #1
    hasysf is offline Member
    Join Date
    Jul 2008
    Posts
    19
    Rep Power
    0

    Default Postfix this!!

    Hello
    I have been given a expression in infix form i.e

    ("1999 < year & year < 2000");

    I have no clue how to post fix this expression
    Any ideas would be appreciated.
    thanks

  2. #2
    Fubarable's Avatar
    Fubarable is offline Moderator
    Join Date
    Jun 2008
    Posts
    19,316
    Blog Entries
    1
    Rep Power
    25

    Default

    I know that this is irrelevant to your question, but your expression as shown appears to be always false. EDIT: this is incorrect. Instead it appears to contain a redundant boolean. Sorry.

    Regarding changing infix to postfix, I've found many fine tutorials online via Google. Have you given that a go yet? If so, what have you found? What have you tried?

    Best of luck.

    Edit: I did another search since it's been a while since I've looked this. On first glance, the Wikipedia article on this looks not bad. Why not give it a look:
    Shunting Yard Algorithm
    Last edited by Fubarable; 09-07-2009 at 06:34 PM.

  3. #3
    hasysf is offline Member
    Join Date
    Jul 2008
    Posts
    19
    Rep Power
    0

    Default

    I have coded till the stack filling out the year and the number,, but i am stuck with the operator precendence thing. I dont no what to do it and how to do it,
    I have search on the net,, but i am confused abt the code..

  4. #4
    Fubarable's Avatar
    Fubarable is offline Moderator
    Join Date
    Jun 2008
    Posts
    19,316
    Blog Entries
    1
    Rep Power
    25

    Default

    I'm no pro at this, but there are others here who are... but to better allow them/us to help you, please post what you have so far. So please post your code (with code tags -- see my signature), and if you have any data files, post those too.

    Much luck!

    edit: I've just reviewed the Wikipedia article, and it does in fact address operator precedence. It's all there! :)
    Last edited by Fubarable; 09-07-2009 at 06:31 PM.

  5. #5
    r035198x is offline Senior Member
    Join Date
    Aug 2009
    Posts
    2,388
    Rep Power
    7

Similar Threads

  1. Postfix into prefix and vice versa
    By sfe23 in forum New To Java
    Replies: 9
    Last Post: 02-19-2009, 10:37 PM
  2. Postfix Evaluation using a Stack, Help?
    By dalangley in forum New To Java
    Replies: 2
    Last Post: 02-16-2009, 10:43 PM
  3. Postfix-Notation
    By little_polarbear in forum New To Java
    Replies: 9
    Last Post: 09-09-2008, 04:24 PM
  4. Replies: 0
    Last Post: 04-15-2008, 07:36 PM
  5. How to parse postfix arithmetic expressions
    By Java Tip in forum java.lang
    Replies: 0
    Last Post: 04-15-2008, 07:36 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •