Computer Science Canada

Loop Fail
Author:  ProgrammingFun [ Sat Jan 08, 2011 1:09 pm ]
Post subject:  Loop Fail
I can't think of any way to do this in a more efficient way (perhaps using for-loops)...so I posted to ask, is there a better way to do this?

Java:

            checkBoard[0][0] = gameBoard[x-1][y-1];
            checkBoard[0][1] = gameBoard[x][y-1];
            checkBoard[0][2] = gameBoard[x+1][y-1];
            checkBoard[1][0] = gameBoard[x-1][y];
            checkBoard[1][1] = gameBoard[x][y];
            checkBoard[1][2] = gameBoard[x+1][y];
            checkBoard[2][0] = gameBoard[x-1][y+1];
            checkBoard[2][1] = gameBoard[x][y+1];
            checkBoard[2][2] = gameBoard[x+1][y+1];
Author:  Tony [ Sat Jan 08, 2011 1:15 pm ]
Post subject:  RE:Loop Fail
If by "more efficient" you mean "less lines of code", then yes. Two for-loops and a single assignment statement.

Edit: strictly speaking, you can do this with a single for-loop, at the cost of readability.
Author:  Insectoid [ Sat Jan 08, 2011 1:17 pm ]
Post subject:  RE:Loop Fail
A nested for loop should do the trick.
code:

for x_ : 0-2 {
    for y : 0-2 {
        checkerBoard[x_][y] = gameBoard[x+y-1][x+x_-1]
    }
}
Author:  ProgrammingFun [ Sat Jan 08, 2011 2:23 pm ]
Post subject:  RE:Loop Fail
Thanks for the help. I used the following method:
Java:

for (int a = 0; a < 3; a++)
{
        for (int b = 0; b < 3; b++)
        {
                checkBoard[a][b] = gameBoard[y + b - 1][x + a - 1];
                System.out.print (checkBoard[a][b] + " ");
        }
                                       
}
Author:  ProgrammingFun [ Sat Jan 08, 2011 5:02 pm ]
Post subject:  RE:Loop Fail
An unrelated question:

If nowin is a boolean will:

    if (nowin) mean the same thing as if (nowin == true)

    if (!nowin) mean the same thing as if (nowin == false)


Thanks for the help!
Author:  2goto1 [ Sat Jan 08, 2011 5:24 pm ]
Post subject:  RE:Loop Fail
Yes and yes. Try spitting out each to your console to confirm
Author:  ProgrammingFun [ Sat Jan 08, 2011 5:52 pm ]
Post subject:  Re: RE:Loop Fail
2goto1 @ Sat Jan 08, 2011 5:24 pm wrote:
Yes and yes. Try spitting out each to your console to confirm
OK, thanks for the help...
Author:  copthesaint [ Mon Jan 10, 2011 3:31 am ]
Post subject:  Re: Loop Fail
Tony wrote:

If by "more efficient" you mean "less lines of code", then yes. Two for-loops and a single assignment statement.
Edit: strictly speaking, you can do this with a single for-loop, at the cost of readability.


Sooo...
Does this work for yea then Razz SAVES 1 LINE!!! Smile *not counting brackets*

Java:
for (int i = 0; i < 9; i++){
heckBoard[((i-(i%3))/3)][(i%3)] = gameBoard[y + (i%3) - 1][x + ((i-(i%3))/3) - 1];
                System.out.print (checkBoard[a][(i%3)] + " ");
}


Lol I dont want to know how complex it would be to minipulate the values for a 3 dimensional array doing this... lol
Author:  DemonWasp [ Mon Jan 10, 2011 10:45 am ]
Post subject:  RE:Loop Fail
Incidentally, always choose readability over number of lines of code. In fact, choose readability over anything except a real requirement.
Author:  Tony [ Mon Jan 10, 2011 11:42 am ]
Post subject:  Re: Loop Fail
copthesaint @ Mon Jan 10, 2011 3:31 am wrote:
Lol I dont want to know how complex it would be to minipulate the values for a 3 dimensional array doing this... lol

You weren't around for this, but things very quickly get out of hand... http://compsci.ca/blog/your-computer-science-isu-in-20-lines/
Author:  copthesaint [ Tue Jan 11, 2011 10:28 pm ]
Post subject:  RE:Loop Fail
Lol, that is really great tony... Very Happy, Also DemonWasp, whats the fun in readability Razz jk

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