problem with a maze program

Question

skoon 0 Newbie Poster

12 Years Ago

I am new to programming, so please accept my apologies if this question is simple.

I'm creating a program that generates a random maze depending on the starting point you enter.

I did every thing but when I execute the program, it doesn't show the path to get out from the maze.

this is my code

import java.io.*;
import java.util.*;
import java.util.ArrayList;

public class lab29a
{
	public static void main(String args[]) throws IOException
	{
		System.out.println("\nLab 29a \n");
		BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
		System.out.print("Enter random starting seed  ===>>  ");
		int seed = Integer.parseInt(input.readLine());

		Maze maze = new Maze(seed);
		maze.displayMaze();
		maze.solveMaze();
		maze.displayMaze();
		maze.mazeSolution();
	}
}

class Coord  	// Coord is a class that stores a single maze location.
{
    private int rPos;
    private int cPos;
    public Coord (int r, int c) 	{ rPos = r; cPos = c; }
    public boolean isFree() 		{ return (rPos == 0 && cPos == 0); }
    public void setPos(int r, int c) 	{ rPos+= r; cPos+= c; }
    public int getrPos() 	        { return  rPos;   }
    public int getcPos() 	        { return  cPos;   }
}

class Maze
{
	private char mat[][];			// 2d character array that stores the maze display
	private Coord currentMove;		// object that stores current maze position
	private MyStack visitStack;		// stack that stores location that have been visited

	// constructor which generates the random maze, random starting location
	// and initializes Maze class values.  If the random value equals 0 the maze
	// store an 'X' otherwise it store an 'O' in the maze.
	public Maze(int seed)
	{
		Random random = new Random(seed);
		int startRow, startCol;
		mat = new char[12][12];
		for (int r = 0; r < 12; r++)
			for (int c = 0; c < 12; c++)
			{
				if (r == 0 || c == 0 || r == 11 || c == 11)
					mat[r][c] = 'X';
				else
				{
					int rndInt = random.nextInt(2);
					if (rndInt == 0)
						mat[r][c] = 'X';
					else
						mat[r][c] = 'O';
				}
			}
		mat[0][0] = 'O';
		startRow = random.nextInt(12);
		startCol = 11;
		mat[startRow][startCol] = '.';
		visitStack = new  MyStack();
		currentMove = new Coord(startRow,startCol);
		visitStack.push(currentMove);
	}

	// displays the current maze configuration
	void displayMaze() throws IOException
	{
		System.out.println("\nRANDOM MAZE DISPLAY\n");
		for (int r = 0; r < 12; r++)
		{
			for (int c = 0; c < 12; c++)
				System.out.print(mat[r][c] + "  ");
			System.out.println();
		}
		System.out.println();
		pause();
	}

	// This method solves the maze with private helper method <getMove>.
	// A loop is needed to repeat getting new moves until either a maze solution
	// is found or it is determined that there is no way out off the maze.
	public void solveMaze() throws IOException
	{
		System.out.println("\n>>>>>   WORKING  ....  SOLVING MAZE   <<<<<\n");

		MyStack visit = new MyStack();

		while(getMove())
		{
			mat[currentMove.getrPos()][currentMove.getcPos()] = '.';
		}
	}

	// Short method to display the result of the maze solution
	public void mazeSolution()
	{
		if (currentMove.isFree())
			System.out.println("\nTHE MAZE HAS A SOLUTION.\n");
		else
			System.out.println("\nTHE MAZE HAS NO SOLUTION.\n");
	}

	// This method determines if a coordinate position is inbounds or not
	private boolean inBounds(int r, int c)
	{
		boolean inBound = false;

		if(r >= 0 && c >= 0)
		{
			if((r + 1 ) < mat.length && (c + 1) < mat[0].length)
				inBound = true;
		}

		return inBound;
	}

   	// This method checks eight possible positions in a counter-clock wise manner
	// starting with the (-1,0) position.  If a position is found the method returns
	// true and the currentMove coordinates are altered to the new position
	private boolean getMove() throws IOException
	{
		boolean canmove = false;
		int tempRow = 0;
		int tempCol = 0;

		if(inBounds((currentMove.getrPos() - 1), (currentMove.getcPos() - 0)) == true)
		{
			if(mat[currentMove.getrPos() - 1][currentMove.getcPos() - 0] == '0')
			{
				canmove = true;

				tempRow = currentMove.getrPos() - 1;
				tempCol = currentMove.getcPos() - 0;
			}
		}

		if(inBounds(currentMove.getrPos(), currentMove.getcPos()) == true)
		{
			if(mat[currentMove.getrPos() - 1][currentMove.getcPos() + 1] == '0')
			{
				System.out.println("I'm here 3");

				canmove = true;

				tempRow = currentMove.getrPos() - 1;
				tempCol = currentMove.getcPos() + 1;
			}
		}

		if(inBounds((currentMove.getrPos() - 0), (currentMove.getcPos() + 1)) == true)
		{
			if(mat[currentMove.getrPos() - 0][currentMove.getcPos() + 1] == '0')
			{
				canmove = true;

				tempRow = currentMove.getrPos() - 0;
				tempCol = currentMove.getcPos() + 1;
			}
		}

		if(inBounds((currentMove.getrPos() + 1), (currentMove.getcPos() + 1)) == true)
		{
			if(mat[currentMove.getrPos() + 1][currentMove.getcPos() + 1] == '0')
			{
				canmove = true;

				tempRow = currentMove.getrPos() + 1;
				tempCol = currentMove.getcPos() + 0;
			}
		}

		if(inBounds((currentMove.getrPos() + 1), (currentMove.getcPos() - 0)) == true)
		{
			if(mat[currentMove.getrPos() + 1][currentMove.getcPos() - 0] == '0')
			{
				canmove = true;

				tempRow = currentMove.getrPos() + 1;
				tempCol = currentMove.getcPos() - 0;
			}
		}

		if(inBounds((currentMove.getrPos() + 1), (currentMove.getcPos() - 1)) == true)
		{
			if(mat[currentMove.getrPos() + 1][currentMove.getcPos() - 1] == '0')
			{
				canmove = true;

				tempRow = currentMove.getrPos() + 1;
				tempCol = currentMove.getcPos() - 1;
			}
		}

		if(inBounds((currentMove.getrPos() - 0), (currentMove.getcPos() - 1)) == true)
		{
			if(mat[currentMove.getrPos() - 0][currentMove.getcPos() - 1] == '0')
			{
				canmove = true;

				tempRow = currentMove.getrPos() - 0;
				tempCol = currentMove.getcPos() - 1;
			}
		}

		if(inBounds((currentMove.getrPos() - 1), (currentMove.getcPos() - 1)) == true)
		{
			if(mat[currentMove.getrPos() - 1][currentMove.getcPos() - 1] == '0')
			{
				canmove = true;

				tempRow = currentMove.getrPos() - 1;
				tempCol = currentMove.getcPos() - 1;
			}
		}

		currentMove = new Coord(tempRow, tempCol);

		return canmove;
	}

	private void pause() throws IOException
	{
		BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
		String dummy;
		System.out.print("\nPress <Enter> to continue  ===>>  ");
		dummy = input.readLine();
	}
}



class MyStack<E>
{
	private ArrayList<E> data;	// stores stack data
	private int top;		// keeps index of the stack top

	public MyStack()
	// Initializes an empty array object with references of private variable data objects.
	{
		data = new ArrayList<E>();
		top = -1;
	}

	public boolean isEmpty()
	// Returns true if data is empty, false otherwise
	{
		return top == -1;
	}

	public void push (E x)
	// Adds variable x to the top of the stack
	{
		data.add(x);
		top++;
	}

	public E pop()
	// Returns and removes the top element from the stack
	{
		int temp = top;
		top--;
		return data.remove(temp);
	}

	public E peek()
	// Returns the top element from the stack without removal
	{
		return data.get(top);
	}

}

and here is my output

Lab 29a

Enter random starting seed  ===>> 100

RANDOM MAZE DISPLAY

O  X  X  X  X  X  X  X  X  X  X  X
X  O  O  X  O  O  X  O  X  O  O  X
X  O  X  X  X  X  X  O  O  O  X  X
X  X  X  O  O  O  X  X  X  X  X  X
X  O  O  O  X  O  O  X  O  X  X  X
X  X  O  X  O  O  X  O  O  X  X  X
X  X  O  X  O  X  O  X  X  X  O  .
X  X  O  O  O  X  O  O  X  O  O  X
X  O  O  X  O  X  O  O  O  O  X  X
X  X  X  O  X  X  X  X  X  O  X  X
X  O  O  X  X  O  O  X  X  X  X  X
X  X  X  X  X  X  X  X  X  X  X  X


Press <Enter> to continue  ===>>

>>>>>   WORKING  ....  SOLVING MAZE



RANDOM MAZE DISPLAY

O  X  X  X  X  X  X  X  X  X  X  X
X  O  O  X  O  O  X  O  X  O  O  X
X  O  X  X  X  X  X  O  O  O  X  X
X  X  X  O  O  O  X  X  X  X  X  X
X  O  O  O  X  O  O  X  O  X  X  X
X  X  O  X  O  O  X  O  O  X  X  X
X  X  O  X  O  X  O  X  X  X  O  .
X  X  O  O  O  X  O  O  X  O  O  X
X  O  O  X  O  X  O  O  O  O  X  X
X  X  X  O  X  X  X  X  X  O  X  X
X  O  O  X  X  O  O  X  X  X  X  X
X  X  X  X  X  X  X  X  X  X  X  X


Press <Enter> to continue  ===>>

THE MAZE HAS A SOLUTION.

Press any key to continue...

this is what should the output be

Enter random starting seed ===>> 100
RANDOM MAZE DISPLAY
O X X X X X X X X X X X
X O O X O O X O X O O X
X O X X X X X O O O X X
X X X O O O X X X X X X
X O O O X O O X O X X X
X X O X O O X O O X X X
X X O X O X O X X X O .
X X O O O X O O X O O X
X O O X O X O O O O X X
X X X O X X X X X O X X
X O O X X O O X X X X X
X X X X X X X X X X X X

Press <Enter> to continue ===>>
>>>>> WORKING .... SOLVING MAZE <<<<<
RANDOM MAZE DISPLAY
O X X X X X X X X X X X
X O O X O O X O X O O X
X O X X X X X O O O X X
X X X . . . X X X X X X
X . . . X . . X . X X X
X X . X . . X . . X X X
X X . X . X . X X X . .
X X . . . X . . X . . X
X . . X . X . . . . X X
X X X . X X X X X . X X
X . . X X O O X X X X X
X X X X X X X X X X X X
Press <Enter> to continue ===>>
THE MAZE HAS NO SOLUTION.

I think the problem is in the solvemaze() method, but I couldn't figure out how to fix it

please help me for I need to know how to fix the program

thank you in advance

java

Edited 12 Years Ago by skoon because: n/a

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NormR1 563 Posting Sage

12 Years Ago

Cross posted at http://www.javaprogrammingforums.com/whats-wrong-my-code/13567-problem-maze-program.html

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skoon 0 Newbie Poster · Answer 1 · 2012-01-23T10:19:13+00:00