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#1
March 19th, 2013, 08:37 PM
 jun9380
Registered User

Join Date: Mar 2013
Posts: 1
Time spent in forums: 5 m 34 sec
Reputation Power: 0
Recursion problem

Hi! I need help with my homework.
We are learning 2d arrays and the program is supposed to check whether there is a connection of trues from the bottom of the board to the top. And I keep getting java.lang.StackOverflow. I think it's because there is an infinite loop when there is two trues side by side. Can anybody suggest me a solution? Thanks in advance.

My code:
public static boolean recurse(boolean[][] board,int row, int col)
{
if (col < 0 || col > board[0].length-1)
return false;
else
{
if (row == 0 && board[row][col] == true)
return true;
else if (board[row][col] == false)
return false;
else
{
if (recurse(board,row-1,col) == true || recurse(board,row,col+1) == true || recurse(board,row,col-1) == true)
return true;
else
return false;
}
}
}

public static boolean isConnected(boolean[][] board)
{
for (int i = 0 ; i < board[0].length; i++)
{
if (board[board.length-1][i] == true)
{
if (recurse(board ,board.length - 2, i) == true || recurse(board , board.length-1 , i+1) == true || recurse(board , board.length-1 , i-1) == true)
return true;
}
}
return false;
}

#2
March 20th, 2013, 11:04 AM
 NormR
Contributing User

Join Date: Aug 2010
Location: SW Missouri
Posts: 3,613
Time spent in forums: 2 Weeks 3 Days 6 h 55 m 39 sec
Reputation Power: 347
What is in some of the stack trace that shows where the execution was?

Can you edit your post and wrap the code with code tags to make it easier to read and understand?

Can you post a version of the code that can be compiled, executed and show the problem?

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