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Type: Posts; User: why_always_me

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  1. Replies
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    Re: Java Calculator problems

    Hi yeah I forgot to change it to 10.

    I am now having the code give me the same answer for each equation the out put is:



    49+62*61-36
    15.666666666666668
    4/64
    15.666666666666668
  2. Replies
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    761

    Re: Java Calculator problems

    Hi I managed to get it working for one equation by moving the end bracket of the while statement to line 101.

    I am now getting the following error:
    Exception in thread "main"...
  3. Replies
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    Re: Java Calculator problems

    Hi

    I have tried that and I am unable to find the reason for it just using the last token.

    Basically what happens is when I call the RPNtoDouble function I was printing the token that was being...
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    Re: Java Calculator problems

    sorry I added the description so it was clear what they should be.

    at the minute the input file contains only:
    49+62*61-36

    and the output should be
    49+62*61-36
    [49+62*61-36]
    3795
  5. Replies
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    Re: Java Calculator problems

    Hi the program currently outputs:

    49+62*61-36
    [36]
    36.0

    whereas the program should be giving me

    equation read in
    49+62*61-36
  6. Replies
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    Java Calculator problems

    Hi Everyone

    My code is an implementation of the shunting yard algorithm - Shunting-yard algorithm - Wikipedia, the free encyclopedia to convert infix expressions to postfix. I then try and solve...
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    Re: Java calculator implementation

    Hi Guys my new thinking is :

    List class
    Node class
    Shunting yard class
    Main class
    Main includes the reverse Polich notation, filereader and tokenizer.

    My question now is how would i...
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    Re: Java calculator implementation

    so my thinking now is to have the following classes:

    stack class
    main - filereading, dealing with the numbers+operands
    shunting yard class

    Is this an acceptable sort of hierarchy?

    thanks
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    Re: Java calculator implementation

    Hi thanks for the help.

    How would I implement my own stack without using the java utils?

    also what sort of hierarchy should i use? I was thinking maybe a filereader class and then one to deal...
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    Java calculator implementation

    am basically attempting to create a calculator using a class hierarchy - the basic function will be:

    Convert the String representation into a list of Tokens
    Convert the List of Tokens into Polish...
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    Re: Java programme to colour in a grid

    Hi so i tried using if statements to set my rNum variable and it never changes from 0? any ideas?



    public void readStartFile(String fileName){
    int rNum=0;
    int cNum=0;
    ...
  12. Replies
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    Re: Java programme to colour in a grid

    Hi I have now found out how to use the split method correctly. here is my piece of code used for an example as you suggested.


    public class SplitExample{

    public static void main(String...
  13. Replies
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    Re: Java programme to colour in a grid

    managed to get jdk 7 working now. still slightly confused by the split() method though. is there any easier way of detecting the R,C and colour?

    thanks
  14. Replies
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    Re: Java programme to colour in a grid

    sorry i am not too sure :(. Can not get any code to compile on my laptop at the minute after trying to install jdk 7. no matter what program i try and run i just get the error could not find or load...
  15. Replies
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    Re: Java programme to colour in a grid

    i removed the bottom line strLine.removeCharAt(strLine[0]);
    and it compiles fine.
  16. Replies
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    Re: Java programme to colour in a grid

    ok so it should be something like



    while ((strLine = br.readLine()) != null) {
    strLine.split(" ");
    strLine.removeCharAt(strLine[0]);

    }
  17. Replies
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    Re: Java programme to colour in a grid

    ok thanks. so would that mean i would do something like



    while ((strLine = br.readLine()) != null) {
    strLine.split(" ");
    strLine = strLine.substring(0,...
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    Re: Java programme to colour in a grid

    Hi I will be determining the correct square by trying to parse the row and column info from the file as well as the colour and then using



    buttons[row][col].setBackground(colour)


    where row...
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    Re: Java programme to colour in a grid

    Hi I have managed to get the colouring in part to work :) but i am now confused on how to do the file reading. below is the new code that colours squares and SHOULD fill some in from the start. the...
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    Re: Java programme to colour in a grid

    Hi ok thanks for that. I have now managed to get the squares to change colour. How will i now make them go back to default if they are clicked and they have been coloured in? thanks

    here is the...
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    Java programme to colour in a grid

    Hi this is my first post here.

    basically i want a programme to do teh following:

    1)create a 6x6 grid.
    2)ask the user to choose from 6 colours to fill a square
    3)test to see if one row or...
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