Welcome to the Java Programming Forums


The professional, friendly Java community. 21,500 members and growing!


The Java Programming Forums are a community of Java programmers from all around the World. Our members have a wide range of skills and they all have one thing in common: A passion to learn and code Java. We invite beginner Java programmers right through to Java professionals to post here and share your knowledge. Become a part of the community, help others, expand your knowledge of Java and enjoy talking with like minded people. Registration is quick and best of all free. We look forward to meeting you.


>> REGISTER NOW TO START POSTING


Members have full access to the forums. Advertisements are removed for registered users.

Results 1 to 2 of 2

Thread: What am I msising?

  1. #1
    Junior Member
    Join Date
    Dec 2008
    Posts
    11
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Default What am I msising?

    To be truthful, this is an assignment for my class that has just ended. I turned it in thinking that I had finished it. I was suppose to do the three methods at the bottom of the code and I did and I believe its correct but my professor gave me my grade saying that it didnt compile and I dont know why. Can someone help?

    import java.util.Scanner;
     import java.util.Random;
     
     
     public class user_Life
     {
     
        // the size of the grid (GRIDSIZE x GRIDSIZE)
        final private static int GRIDSIZE = 18;
     
        /********************************************************************************/
        public static void main ( String args[] )
        {
            boolean[][] board = new boolean[GRIDSIZE][GRIDSIZE];
            char choice;
            int x = 1;
            Scanner sc = new Scanner ( System.in );
     
            do
            {
                System.out.print ( "Start with a (r)andom board, the (q)ueen bee shuttle or the (g)lider pattern? ");
                choice = sc.next().charAt(0);
            } while ( choice != 'r' && choice != 'q' && choice != 'g' );
     
            clearGrid (board);
            setup(board,choice);
     
            do
            {
                System.out.printf ("Viewing generation #%d:\n\n", x++);
                displayGrid(board);
                genNextGrid(board);
                System.out.print ("\n(q)uit or any other key + ENTER to continue: ");
                choice = sc.next().charAt(0);
            } while ( choice != 'q' );
     
        }
     
        /********************************************************************************/
        public static void setup (boolean[][] board, char which )
        {
            Random randomNumbers = new Random();
     
            clearGrid(board);
     
            if ( which == 'q' )
            {
                // Set up the Queen Bee Shuttle pattern
                board[5][1] = true;board[5][2] = true;board[6][3] = true;board[7][4] = true;
                board[8][4] = true;board[9][4] = true;board[10][3] = true;board[11][2] = true;
                board[11][1] = true;
            }
     
            else if ( which == 'g' )
            {
                // Set up a Glider
                board [17][0] = true; board[16][1] = true; board[15][1] = true;
                board[16][2] = true;
                board [17][2] = true;
            }
            else
            {
                // set up random
                for (int row = 0; row < board.length; row++ )
                {
                    for (int col = 0; col < board[row].length; col++ )
                    {
                        if ( randomNumbers.nextInt() % 2 == 0 )
                            board[row][col] = true;
                    }
                }
            }
     
        }
     
        /********************************************************************************/
        public static void displayGrid (boolean[][] grid)
        {
            // Start printing the top row of numbers
            System.out.print ("   ");
            for (int x = 1; x <= grid.length; x++)
            {
                if ((x / 10) != 0)
                    System.out.printf ( "%d", x / 10 );
                else
                    System.out.print ( " " );
            }
     
            System.out.println();
            System.out.print( "   " );
     
            for (int x = 1; x <= grid.length; x++)
            {
                System.out.printf ( "%d", x % 10 );
            }
            System.out.println();
     
            for (int r = 0; r < grid.length; r++)
            {
                System.out.printf ( "%d", r+1 );
                if (r + 1 < 10)
                    System.out.print ( "  " );
                else
                    System.out.print ( " " );
                for (int c = 0; c < grid.length; c++)
                {
                    if (grid[r][c] == true)
     
                   System.out.print ( "*" );
                    else
                        System.out.print ( " " );
                }
                System.out.println();
            }
        }
     
     
        /*******************************************************************************/
     
        // put the three methods you must write here and make sure to document
        // them!
     
        public static void clearGrid ( boolean[][] board )
        {
           int col=0;
           for (int row = 0; row <=18; row++)
                   {
                   while(col<18)
                   {
                           board [row][col] = false ;
                           col++;
                   }
                   }
     
        }
     
     public static void genNextGrid ( boolean[][] board )
     {
           boolean[][] temp = new boolean[GRIDSIZE][GRIDSIZE];
           for (int row=0; row<GRIDSIZE; row++)//start of row
           {
                   for (int col=0; col<GRIDSIZE; col++)
                   {
                           temp[row][col]=board[row][col];
                           int count = countNeighbors ( temp , row, col );
                           switch (count)
                           {//start of count switch
                           case 0: case 1:
                                   temp[row][col]=false;
                                   break;
                           case 2:
                                   if(temp[row][col])
                                           temp[row][col]=true;
                                   if(!temp[row][col])
                                           temp[row][col]=false;
                                   break;
                           case 3:
                                   temp[row][col]=true;
                                   break;
                           case 4: case 5: case 6: case 7: case 8:
                                   temp[row][col]=false;
                                   break;
                           }//end of switch statement
                           board [row][col]=temp[row][col];
                           displayGrid(board);
                   }//end of for row
           }
     }
     
     public static int countNeighbors ( final boolean[][] board, final int row, final int col )
     {
           int ncount = 0;
                   for(int r = row-1; r <= row+1; r++)
                   {
                           if(row < 0 || row >= GRIDSIZE )
                           {
                                   continue;
                           }
                           for(int c = col - 1; c <= col + 1; c++)
                   {
                           if(col < 0 || col >= GRIDSIZE || (r == row && c == col))
                           {
                                   continue;
                           }
                           if(board[row][col])
                           {
                           ncount++;
                           }
                   }
                   }
                   return ncount;
           }
     
        }
     }

  2. #2
    Administrator copeg's Avatar
    Join Date
    Oct 2009
    Location
    US
    Posts
    5,262
    Thanks
    176
    Thanked 820 Times in 763 Posts
    Blog Entries
    5

    Default Re: What am I msising?

    Your professor should be able to answer exactly why. Just glancing at the code the description says to be sure to document the methods...and there doesn't seem to be any documentation. The syntax is usually above the method and using format the javadoc tool understands.

    /**
    *This is how you document a method. This documents and explains the method below, which 
    * is some pathetic excuse for a method that doesn't really do much except return true for any 
    * value of x.
    *@param x A valid integer
    * @return a boolean value - always true
    */
    public boolean myMethod(int x){
    return true;
    }