Two dimensional Arrays - Dev Articles

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December 12th, 2004, 01:07 PM

br459

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Two dimensional Arrays

I am having trouble getting my display function to work. My code currently outputs a series of rectangles instead of one rectangle with the characters incorporated like the output at the bottom. Any help will be appreciated.
#include <iostream>

usingnamespace::std;

constint NUM_ROWS = 10, // Board dimensions

NUM_COLS = 20;

// Function prototypes

void fillRectangle ( char board[NUM_ROWS] [NUM_COLS] ,

int row, int col,

int width, int height, char fillChar );

void displayBoard ( constchar board[NUM_ROWS] [NUM_COLS] );

int main ()

{

char board[NUM_ROWS][NUM_COLS]; // Message board

// Initialize the message board to all periods.

fillRectangle(board,0,0,NUM_COLS,NUM_ROWS,'.');

// Load and display a message.

fillRectangle(board,2,2,6,2,'C');

fillRectangle(board,4,2,3,4,'C');

fillRectangle(board,6,5,3,2,'C');

fillRectangle(board,4,10,3,1,'#');

fillRectangle(board,3,16,1,3,'#');

fillRectangle(board,3,11,1,3,'#');

fillRectangle(board,4,15,3,1,'#');

cout << endl;

displayBoard(board);

}

//--------------------------------------------------------------------

void fillRectangle ( char board[NUM_ROWS][NUM_COLS],

int row, int col,

int width, int height, char fillChar )

{

for (int i = 0; i < NUM_ROWS; i++)

{ cout << endl;

for (int j = 0; j < NUM_COLS; j++)

{

cout<< " " <<fillChar;

}

}

cout << endl;

}

//--------------------------------------------------------------------

void displayBoard ( constchar board[NUM_ROWS][NUM_COLS])

{

for (int i = 0; i < NUM_ROWS; i++)

{ cout << i<< " "<<endl;

for (int j = 0; j < NUM_COLS; j++)

{

cout << j<< " " <<endl;

}

}

cout << endl;

}

/*

....................

....................

..CCCCCC............
..CCCCCC...#....#...

..CCC.....###..###..

..CCC......#....#...

..CCCCCC............

..CCCCCC............

....................

Last edited by br459 : December 12th, 2004 at 01:18 PM. Reason: Still checking my code

December 12th, 2004, 01:25 PM

kode_monkey

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Not entirely sure what it is you need help with. Could you explain what you are trying to achieve please?

-KM-

December 12th, 2004, 02:07 PM

br459

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The first time my program calls the function fillRectangle it is suppose to create a rectangle of periods that is ten rows of twenty columns. The next time fillRectangle is called it should start at the cell [2][2] and replace the periods with two rows that are six columns wide of the character C. Finally after all of the periods have been replaced with the C's and #'s the displayBoard function is called and it should print out on screen the output I included in the program I submitted. I can get the rectangle of periods no problem, but when I am making subsequent calls to the fillRectangle function all I get is more rectangles of characters instead of replacing the periods with the new fill character.

Quote:

Originally Posted by kode_monkey

Not entirely sure what it is you need help with. Could you explain what you are trying to achieve please?

-KM-

December 12th, 2004, 09:32 PM

marmo

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Join Date: Sep 2004

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I have fixed the errors in your code. You pretty much had it, you just need a little more work with loops.

Code:

   #include <iostream>
   using namespace std;
   
   // Board dimensions
   const int NUM_ROWS(10);
   const int NUM_COLS(20);
   
   // Forward declarations
   void FillRectangle( char board[NUM_ROWS][NUM_COLS], int row, int col, int width, int height, char fillChar );
   void DisplayBoard ( const char board[NUM_ROWS][NUM_COLS] );
   
   int main()
   {
   	char board[NUM_ROWS][NUM_COLS]; // Message board
   
   	// Initialize the message board to all periods
   	FillRectangle( board, 0, 0, NUM_COLS, NUM_ROWS, '.' );
   	DisplayBoard( board );
   
   	// Starting at ( 2, 2 ) fill 2 rows with 6 'C's
   	FillRectangle( board, 2, 2, 6, 2, 'C' );
   	DisplayBoard( board );
   
   	// Starting at ( 4, 2 ) fill 3 rows with 4 'C's
   	FillRectangle( board, 4, 2, 3, 4, 'C' );
   	DisplayBoard( board );
   
   	// Starting at ( 6, 5 ) fill 3 rows with 2 'C's
   	FillRectangle( board, 6, 5, 3, 2, 'C' );
   	DisplayBoard( board );
   
   	// Starting at ( 4, 10 ) fill 3 rows with 1 '#'s
   	FillRectangle( board, 4, 10, 3, 1, '#' );
   	DisplayBoard( board );
   
   	// Starting at ( 3, 16 ) fill 1 row with 3 '#'s
   	FillRectangle( board, 3, 16, 1, 3, '#' );
   	DisplayBoard( board );
   
   	// Starting at ( 3, 11 ) fill 1 row with 3 '#'s
   	FillRectangle( board, 3, 11, 1, 3, '#');
   	DisplayBoard( board );
   
   	// Starting at ( 4, 15 ) fill 3 rows with 1 '#'s
   	FillRectangle( board, 4, 15, 3, 1, '#' );
   	DisplayBoard( board );
   
   	cout << endl;
	return 0;
   }
   
   // Fills a rectangle with a specified char
   void FillRectangle( char board[NUM_ROWS][NUM_COLS], int row, int col, int width, int height, char fillChar )
   {
   	// Cycle through rows
   	for( int i(row); i < row + height; ++i )
   	{
   		// Cycle through cols
   		for( int j(col); j < col + width; ++j )
   		{
 			// Change the value at position ( i, j ) to the fillChar
   			board[i][j] = fillChar;
   		}
   	}
   }
   
   // Displays the board
   void DisplayBoard( const char board[NUM_ROWS][NUM_COLS] )
   {
   	// Cycle through rows
   	for( int i = 0; i < NUM_ROWS; i++)
   	{
   		cout << endl;
   
   		// Cycle through cols
   		for( int j = 0; j < NUM_COLS; j++)
   		{
   			// Display the value at ( i, j )
   			cout << board[i][j] << " ";
   		}
   	}
   	cout << endl;
   }

December 13th, 2004, 06:20 PM

br459

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Join Date: Dec 2004

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Thanks for your help.

Quote:

Originally Posted by marmo

I have fixed the errors in your code. You pretty much had it, you just need a little more work with loops.

Code:

#include <iostream>
using namespace std;
 
// Board dimensions
const int NUM_ROWS(10);
const int NUM_COLS(20);
 
// Forward declarations
void FillRectangle( char board[NUM_ROWS][NUM_COLS], int row, int col, int width, int height, char fillChar );
void DisplayBoard ( const char board[NUM_ROWS][NUM_COLS] );
 
int main()
{
	char board[NUM_ROWS][NUM_COLS]; // Message board
 
	// Initialize the message board to all periods
	FillRectangle( board, 0, 0, NUM_COLS, NUM_ROWS, '.' );
	DisplayBoard( board );
 
	// Starting at ( 2, 2 ) fill 2 rows with 6 'C's
	FillRectangle( board, 2, 2, 6, 2, 'C' );
	DisplayBoard( board );
 
	// Starting at ( 4, 2 ) fill 3 rows with 4 'C's
	FillRectangle( board, 4, 2, 3, 4, 'C' );
	DisplayBoard( board );
 
	// Starting at ( 6, 5 ) fill 3 rows with 2 'C's
	FillRectangle( board, 6, 5, 3, 2, 'C' );
	DisplayBoard( board );
 
	// Starting at ( 4, 10 ) fill 3 rows with 1 '#'s
	FillRectangle( board, 4, 10, 3, 1, '#' );
	DisplayBoard( board );
 
	// Starting at ( 3, 16 ) fill 1 row with 3 '#'s
	FillRectangle( board, 3, 16, 1, 3, '#' );
	DisplayBoard( board );
 
	// Starting at ( 3, 11 ) fill 1 row with 3 '#'s
	FillRectangle( board, 3, 11, 1, 3, '#');
	DisplayBoard( board );
 
	// Starting at ( 4, 15 ) fill 3 rows with 1 '#'s
	FillRectangle( board, 4, 15, 3, 1, '#' );
	DisplayBoard( board );
 
	cout << endl;
	return 0;
}
 
// Fills a rectangle with a specified char
void FillRectangle( char board[NUM_ROWS][NUM_COLS], int row, int col, int width, int height, char fillChar )
{
	// Cycle through rows
	for( int i(row); i < row + height; ++i )
	{
		// Cycle through cols
		for( int j(col); j < col + width; ++j )
		{
			// Change the value at position ( i, j ) to the fillChar
			board[i][j] = fillChar;
		}
	}
}
 
// Displays the board
void DisplayBoard( const char board[NUM_ROWS][NUM_COLS] )
{
	// Cycle through rows
	for( int i = 0; i < NUM_ROWS; i++)
	{
		cout << endl;
 
		// Cycle through cols
		for( int j = 0; j < NUM_COLS; j++)
		{
			// Display the value at ( i, j )
			cout << board[i][j] << " ";
		}
	}
	cout << endl;
}

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