Write a method that can be called, that will initialize the seating plan.

[Dustin Schreader]

I'm having a few problems and not sure how to make it work

1. the program should not be initializing the seating plan when it is declared. I need to write a method that
I can call that will initialize the seating plan to all seats available. Then when I loop to start over,
I can just call that method to reset the seating plan.

2. Also, when the user selects E or F the program should tell them the valid rows for that ticket type to select from.
And when the user selects smoking or nonsmoking it should tell them the valid rows.

I appreciate all the help I can get thank you!

/*
* Author: Dustin Schreader
*
* Date: 05082010
*
* Course: comp 2243 spring
*
* Assignment: Ch. 9 exercise #12 p606
*
* Description: Prompts user for seating that they prefer
*					The user may choose from economy or first class          
*					If economy is chosen the user may choose smoking
*					Or non smoking then may choose a seat from an array
*					The array will be used by picking row numbers and
*					Column letters, the user may choose to reset the 
*					Program or continue to choose a seat.
*					
*/

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

/**
* 
* Have the user decide which seat they would like to use
* Can choose a seat between smoking and non and economy
* Or first classe
*
* @author Dustin Schreader
* @version 05082010
*/

public class airplaneSeating2
{

	static BufferedReader keyboard = new
		BufferedReader(new InputStreamReader(System.in));
	static PrintWriter screen = new PrintWriter(System.out, true);
	
		static char [][] seatNumber = 
		{
			{'*','*','X','*','X','X'},
			{'*','X','*','X','*','X'},
			{'*','*','X','X','*','X'},
			{'X','*','X','*','X','X'},
			{'*','X','*','X','*','*'},
			{'*','x','*','*','*','X'},
			{'X','*','*','*','X','X'},      //< This part is the seating plan that needs
			{'*','X','*','X','X','*'},      //    to be changed, not supposed to be 
			{'X','*','X','X','*','X'},      //    initialized
			{'*','X','*','X','X','X'},
			{'*','*','X','*','X','*'},
			{'*','*','X','X','X','X'},
			{'*','*','*','*','X','*'},
		};
		
	
		/**
	* prompts the user whether they want economy or first class
	* then it prompts the user for smoking or non if economy
	*
	* @param args not used
	*/
	
	public static void main(String args[]) throws IOException
	{
	
		String inputStr;
		char smokingType = ' ';
		char classType;
		int rowStart = 0;
		int rowEnd = 0;
		
		 System.out.println("  #############################");
		 System.out.println("  #                                                             #");
		 System.out.println("  #         Airplane Seating Program!              #");
		 System.out.println("  #                                                             #");
		 System.out.println("  #############################");
		 System.out.println();
		 
		do
		{	
			
		 System.out.print("Enter Class Preference E for Econonmy, F for First Class: ");
		 inputStr = keyboard.readLine();
		 inputStr = inputStr.toUpperCase();
		 classType = inputStr.charAt(0);
		 System.out.println();
		 
	
			
		 switch (classType)
		 {
		 case 'E':
		 
		 do
		 {
		 	System.out.print("Enter Smoking Preference S for Smoking, N for Non-Smoking: ");
			inputStr = keyboard.readLine();
			inputStr = inputStr.toUpperCase();
			smokingType = inputStr.charAt(0);
			System.out.println();
			
			switch (smokingType)
			{
			case 'S':
				rowStart = 8;
				rowEnd = 13;
				break;
			case 'N':
				rowStart = 3;
				rowEnd = 7;
				break;
			default:
				System.out.println("Invalid Input, Enter N - non smoking or S - smoking!");
				System.out.println();
				break;
			}
			
		}
		
		while (smokingType != 'N' && smokingType != 'S');
			
			break;
			
		case 'F':
			rowStart = 1;
			rowEnd = 2;
			break;
		default:
			
			System.out.println("Invalid Input, enter E - Economy or F - First Class!");
			System.out.println();
			break;
		}
		
		}
		
		while (classType != 'F' && classType != 'E');


		
		printMatrix(seatNumber, rowStart, rowEnd);
		
		chooseSeat(seatNumber, rowStart, rowEnd);
		
		printMatrix(seatNumber, 1, 13);
		
	}
	
	/**
	* This method prints out the matrix for the user
	* to view and see what seats are available to choose
	* from
	*
	* @param args not used
	*/
	
	public static void printMatrix(char[][] matrix, int row1, int row2)
	{
	
		int col;
		
		System.out.println();
		System.out.println("*********** Available Seats ************");
		System.out.printf("%11s %4s %4s %4s %4s %4s", "A", "B", "C", "D", "E", "F");
		System.out.println();
		for (row1 = row1 - 1; row1 < row2; row1++)
		{
		
			System.out.printf("Row %2d", (row1 + 1));
			for (col = 0; col < matrix[row1].length; col++)
			{
				System.out.printf("%5c", matrix[row1][col]);
			}
			System.out.println();
		}
		System.out.println();
		System.out.println("	* indicates the seat is available");
		System.out.println("	X indicates the seat is not available");
		System.out.println();
	}
	
	/**
	* @throws IOException if an input or output
	*							 exception occured
	*/
	
	public static void chooseSeat(char[][] matrix, int row1, int row2) throws IOException
	{
		String inputStr;
		String seat;
		int row;
		char col;
		String colStr;
		int colNo = 10;
		
		
		
		do
		{
				
		System.out.println("To select a seat enter the row number: ");
		inputStr = keyboard.readLine();
		row = new Integer(inputStr);
		System.out.println("Enter the column seat letter: ");
		inputStr = keyboard.readLine();
		
		colStr = inputStr.toUpperCase();
		col = colStr.charAt(0);
		
		System.out.println("Column: " + col);
		
				switch(col)
				{
				case 'A': colNo = 0;
					break;
				case 'B': colNo = 1;
					break;
				case 'C': colNo = 2;
					break;
				case 'D': colNo = 3;
					break;
				case 'E': colNo = 4;
					break;
				case 'F': colNo = 5;
					break;
				default:
				System.out.println("Invalid Input, Enter column A, B, C, D, E, F!");
				System.out.println();
								
					break;
				}
				
				
			}
				
		while (col != 'A' && col != 'B' && col != 'C' && col != 'D' && col != 'E' && col != 'F');				
				
		// ^ lets the user choose seat row number and column letter until
		//  until user chooses correct letter, although if there is 
		//  a number that is incorrect there is not a message sent out
		//  to user and the program exits with error					
		
				System.out.println("Row: " + row);


				seatNumber[row -1][colNo] = 'X';
				
				seat = row + colStr;
				System.out.println("You chose: " + seat);
				System.out.println("Thank you");
				System.out.println();
				

				
		 }
    }

[pete stein]

1. the program should not be initializing the seating plan when it is declared. I need to write a method that
I can call that will initialize the seating plan to all seats available. Then when I loop to start over,
I can just call that method to reset the seating plan.

2. Also, when the user selects E or F the program should tell them the valid rows for that ticket type to select from.
And when the user selects smoking or nonsmoking it should tell them the valid rows.

Let's see what you've attempted for these two problems first.

[Dustin Schreader]

Ok well I think I've almost got the first part of it down but It is printing out 42 instead of char being *. I think I need to declare a char or something... not really sure but this is what I have so far.

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


public class airplaneSeating3
{

	static BufferedReader keyboard = new
		BufferedReader(new InputStreamReader(System.in));
	static PrintWriter screen = new PrintWriter(System.out, true);

static final int ROWS = 12;
static final int COLUMNS = 5;

	public static void main(String args[]) throws IOException
	{
	
	int [][] matrix = new int [ROWS][COLUMNS];
	int row;
	int col;
	int sum;
	int largest;
	int temp;
	 
	for (row = 0; row < matrix.length; row++)
		for (col = 0; col < matrix[row].length; col++)
			matrix[row][col] = '*';
			
			for (row = 0; row < matrix.length; row++)
			{
				for (col = 0; col < matrix[row].length; col++)
					System.out.printf("%7d", matrix[row][col]);
					
				System.out.println();
				
			}
			
		}
	}

[Dustin Schreader]

Sorry I just figured it out...

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


public class airplaneSeating3
{

	static BufferedReader keyboard = new
		BufferedReader(new InputStreamReader(System.in));
	static PrintWriter screen = new PrintWriter(System.out, true);

static final int ROWS = 12;
static final int COLUMNS = 5;

	public static void main(String args[]) throws IOException
	{
	
	char [][] matrix = new char [ROWS][COLUMNS];
	int row;
	int col;
	int sum;
	int largest;
	int temp;
	 
	for (row = 0; row < matrix.length; row++)
		for (col = 0; col < matrix[row].length; col++)
			matrix[row][col] = '*';
			
			for (row = 0; row < matrix.length; row++)
			{
				for (col = 0; col < matrix[row].length; col++)
					System.out.printf("%7c", matrix[row][col]);
					
				System.out.println();
				
			}
			
		}
	}
	

[Dustin Schreader]

I may have figured out how to print a whole bunch of * but since I put that code into my program i get a cannot find symbol. I feel like this question belongs in the beginning java area.

/*
* Author: Dustin Schreader
*
* Date: 05082010
*
* Course: comp 2243 spring
*
* Assignment: Ch. 9 exercise #12 p606
*
* Description: Prompts user for seating that they prefer
*					The user may choose from economy or first class          
*					If economy is chosen the user may choose smoking
*					Or non smoking then may choose a seat from an array
*					The array will be used by picking row numbers and
*					Column letters, the user may choose to reset the 
*					Program or continue to choose a seat.
*					
*/

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

/**
* 
* Have the user decide which seat they would like to use
* Can choose a seat between smoking and non and economy
* Or first classe
*
* @author Dustin Schreader
* @version 05082010
*/

public class airplaneSeating2
{

	static BufferedReader keyboard = new
		BufferedReader(new InputStreamReader(System.in));
	static PrintWriter screen = new PrintWriter(System.out, true);
	
	static final int ROWS = 12;
static final int COLUMNS = 5;
	

		
	
		/**
	* prompts the user whether they want economy or first class
	* then it prompts the user for smoking or non if economy
	*
	* @param args not used
	*/
	
	public static void main(String args[]) throws IOException
	{
	
		String inputStr;
		char smokingType = ' ';
		char classType;
		int rowStart = 0;
		int rowEnd = 0;
		char [][] seatNumber = new char [ROWS][COLUMNS];
		int row;
		int col;
		
		 System.out.println("  #############################");
		 System.out.println("  #                           #");
		 System.out.println("  # Airplane Seating Program! #");
		 System.out.println("  #                           #");
		 System.out.println("  #############################");
		 System.out.println();
		 
		do
		{	
			
		 System.out.print("Enter Class Preference E for Econonmy, F for First Class: ");
		 inputStr = keyboard.readLine();
		 inputStr = inputStr.toUpperCase();
		 classType = inputStr.charAt(0);
		 System.out.println();
		 
	
			
		 switch (classType)
		 {
		 case 'E':
		 
		 do
		 {
		 	System.out.print("Enter Smoking Preference S for Smoking, N for Non-Smoking: ");
			inputStr = keyboard.readLine();
			inputStr = inputStr.toUpperCase();
			smokingType = inputStr.charAt(0);
			System.out.println();
			
			switch (smokingType)
			{
			case 'S':
				rowStart = 8;
				rowEnd = 13;
				break;
			case 'N':
				rowStart = 3;
				rowEnd = 7;
				break;
			default:
				System.out.println("Invalid Input, Enter N - non smoking or S - smoking!");
				System.out.println();
				break;
			}
			
		}
		
		while (smokingType != 'N' && smokingType != 'S');
			
			break;
			
		case 'F':
			rowStart = 1;
			rowEnd = 2;
			break;
		default:
			
			System.out.println("Invalid Input, enter E - Economy or F - First Class!");
			System.out.println();
			break;
		}
		
		}
		
		while (classType != 'F' && classType != 'E');


	 
	for (row = 0; row < seatNumber.length; row++)
		for (col = 0; col < seatNumber[row].length; col++)
			seatNumber[row][col] = '*';
			
			for (row = 0; row < seatNumber.length; row++)
			{
				for (col = 0; col < seatNumber[row].length; col++)
					System.out.printf("%7c", seatNumber[row][col]);
					
				System.out.println();
				
			}

		
		printMatrix(seatNumber, rowStart, rowEnd);
		
		chooseSeat(seatNumber, rowStart, rowEnd);
		
		printMatrix(seatNumber, 1, 13);
		
	}
	
	/**
	* This method prints out the matrix for the user
	* to view and see what seats are available to choose
	* from
	*
	* @param args not used
	*/
	
	public static void printMatrix(char[][] matrix, int row1, int row2)
	{
	
		int col;
		
		System.out.println();
		System.out.println("*********** Available Seats ************");
		System.out.printf("%11s %4s %4s %4s %4s %4s", "A", "B", "C", "D", "E", "F");
		System.out.println();
		for (row1 = row1 - 1; row1 < row2; row1++)
		{
		
			System.out.printf("Row %2d", (row1 + 1));
			for (col = 0; col < matrix[row1].length; col++)
			{
				System.out.printf("%5c", matrix[row1][col]);
			}
			System.out.println();
		}
		System.out.println();
		System.out.println("	* indicates the seat is available");
		System.out.println("	X indicates the seat is not available");
		System.out.println();
	}
	
	/**
	* @throws IOException if an input or output
	*							 exception occured
	*/
	
	public static void chooseSeat(char[][] matrix, int row1, int row2) throws IOException
	{
		String inputStr;
		String seat;
		int row;
		char col;
		String colStr;
		int colNo = 10;
		
		
		
		do
		{
				
		System.out.println("To select a seat enter the row number: ");
		inputStr = keyboard.readLine();
		row = new Integer(inputStr);
		System.out.println("Enter the column seat letter: ");
		inputStr = keyboard.readLine();
		
		colStr = inputStr.toUpperCase();
		col = colStr.charAt(0);
		
		System.out.println("Column: " + col);
		
				switch(col)
				{
				case 'A': colNo = 0;
					break;
				case 'B': colNo = 1;
					break;
				case 'C': colNo = 2;
					break;
				case 'D': colNo = 3;
					break;
				case 'E': colNo = 4;
					break;
				case 'F': colNo = 5;
					break;
				default:
				System.out.println("Invalid Input, Enter column A, B, C, D, E, F!");
				System.out.println();
								
					break;
				}
				
				
			}
				
		while (col != 'A' && col != 'B' && col != 'C' && col != 'D' && col != 'E' && col != 'F');				
				
		// ^ lets the user choose seat row number and column letter until
		//  until user chooses correct letter, although if there is 
		//  a number that is incorrect there is not a message sent out
		//  to user and the program exits with error					
		
				System.out.println("Row: " + row);


				seatNumber[row -1][colNo] = 'X'; 
				
                                //^ here is where I get my cannot find symbol error

				seat = row + colStr;
				System.out.println("You chose: " + seat);
				System.out.println("Thank you");
				System.out.println();
				

				
		 }
    }

[pete stein]

Dustin Schreader wrote:I may have figured out how to print a whole bunch of * but since I put that code into my program i get a cannot find symbol.

You're running into a scope issue in that your seatNumber variable has been declared within the main method and so is only visible from within this method. If you want it visible inside of other methods, either pass it as a parameter to the method or declare it in the class to give it class scope.

I feel like this question belongs in the beginning java area.

Agree.

Another thing you must do is be sure to enclose all blocks in curly braces even if it's an if block with only one line of code. Doing this will save your tail in the future, trust me. Also watch out for pesky semi-colons at the end of the boolean condition of an if block, while loop, for loop and the like as this will short-circuit the loop, i.e.,

while (fubars == 4);  //  <= this semi-colon will mess up the code!
{
   System.out.println("Fubars are 4!);
}

[Dustin Schreader]

Great thank you for the help, I did get it working now.

[pete stein]

Dustin Schreader wrote:Great thank you for the help, I did get it working now.

Yeah! Congrats!

[Rob Spoor]

Dustin Schreader wrote:I feel like this question belongs in the beginning java area.

Well, since Pete agrees, how can I disagree?

[Campbell Ritchie]

You realise that chars like 'a' and 'A' are not letters, but numbers? You can do arithmetic on them. You can try printing 'a' % 0x20 - 1 as a way of converting 'a' to 0. Remember 0x20 is 32 in decimal. That might get rid of those awkward looking switch blocks. It will fall down, however, when you get to 9 seats width and you go from H to J missing out I!