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Thread: Row is column and vice versa?

  1. #1
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    Default Row is column and vice versa?

    For some reason, my code is that column is acting as a row and row acting as a column. Row should be the horizontal count, column being the vertical (as specified by my professor), however they have flipped. If I change the scanner so they take col first then it works correctly.

    import java.util.*;
    public class Bejeweled {
    	public static void main(String[] args) {
    		Scanner scan = new Scanner(System.in);
    		System.out.println("How to play: type a row and column index, followed by the direction to move it: u (up), r (right), d (down), l (left)");
    		char[][] gameChars = new char[8][8];
    		char[] options = new char[] {'*', '$', '@', '+', '!', '&'};
    		populateRandom(gameChars, options);
    		drawGrid(gameChars);
    		System.out.println("Enter <row> <column> <direction to move>, or q to quit");
    		if (scan.hasNextInt()) {
    			int row = scan.nextInt();
    			int col = scan.nextInt();
    			String direction = scan.next();
    			while (isWithinGrid(row,col,direction,gameChars) == false) {
    				System.out.println("Enter <row> <column> <direction to move>, or q to quit");
    				row = scan.nextInt();
    				col = scan.nextInt();
    				direction = scan.next();
    			}
    			swap((row-1), (col-1), direction, gameChars);
    			drawGrid(gameChars);
    			}
    		else {System.out.print("Adios!");
    		}
    	}
    	public static void drawGrid(char[][] grid) {
    		for (int i = 0; i < grid.length; i++) {
    			for (int j = 0; j < grid[i].length; j++) {
    				System.out.print(grid[i][j] + " ");
    			}
    			System.out.println();
    		}
    	}
    	public static void populateRandom(char[][] grid, char[] options) {
    		Random randomNum = new Random();
    		for (int i = 0; i < grid.length; i++) {
    			for (int j = 0; j < grid[i].length; j++) {
    				int randomChar = randomNum.nextInt(5);
    				grid[i][j] = options[randomChar];
    			}
    		}
    	}
    	public static boolean isWithinGrid(int row, int col, String cmd, char[][] grid) {
    		if (row > 1 && row < 8) {
    			if (col > 1 && col < 8) {
    				if (cmd.equals("u") | cmd.equals("l") | cmd.equals("r") | cmd.equals("d")) {
    					return true;
    				}
    				else {return false;}
    			}
    			else if (col == 8) {
    				if (cmd.equals("u") | cmd.equals("l") | cmd.equals("r")) {
    					return true;
    				}
    				else {return false;}
    			}
    			else if (col == 1) {
    				if (cmd.equals("d") | cmd.equals("l") | cmd.equals("r")) {
    					return true;
    				}
    				else {return false;}
    			}
    			else {return false;}
    		}
    		else if (row == 8) {
    			if (col > 1 && col > 8) {
    				if (cmd.equals("u") | cmd.equals("l") | cmd.equals("d")) {
    						return true;
    				}
    				else {return false;}
    			}
    			else if (col == 8) {
    				if (cmd.equals("u") | cmd.equals("l")) {
    					return true;
    				}
    				else {return false;}
    			}
    			else if (col == 1) {
    				if (cmd.equals("d") | cmd.equals("r") | cmd.equals("l")) {
    					return true;
    				}
    				else {return false;}
    			}
    		}
     
    		else if (row == 1) {
    			if (col > 1 && col < 8) {
    				if (cmd.equals("u") | cmd.equals("r") | cmd.equals("d")) {
    					return true;
    				}
    				else {return false;}
    			}
    			else if (col == 1) {
    				if (cmd.equals("r") | cmd.equals("d")) {
    					return true;
    				}
    			else if (col == 8) {
    				if (cmd.equals("r") | cmd.equals("u")) {
    					return true;
    				}
    			}
    			else {return false;}
    			}
    		} else {
    			return false;
    		}
    		return false;
     
    	}
    	public static void swap(int row, int col, String cmd, char[][] grid) {
    		if (cmd.equals("u")) {
    			char temp = grid[row][col];
    			grid[row][col] = grid[row-1][col];
    			grid[row-1][col] = temp;
    		}
    		if (cmd.equals("d")) {
    			char temp = grid[row][col];
    			grid[row][col] = grid[row+1][col];
    			grid[row+1][col] = temp;
    		}
    		if (cmd.equals("l")) {
    			char temp = grid[row][col];
    			grid[row][col] = grid[row][col-1];
    			grid[row][col-1] = temp;
    		}
    		if (cmd.equals("r")) {
    			char temp = grid[row][col];
    			grid[row][col] = grid[row][col+1];
    			grid[row][col+1] = temp;
    		}
    	}
     
    }\


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Row is column and vice versa?

    Is there so output that shows what you are talking about? Post the output and add some comments explaining what the problem is.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Junior Member
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    Default Re: Row is column and vice versa?

    EDIT: Figured it out, my rows/cols were swapped in the swap method. Oops.

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