// Mr. Minich
// CMPSC 201
// August 23, 2000
// Ch. 11 Demo Program #1
// Purpose - to illustrate passing a two-dimensional array of chars by reference

#include <iostream>
using namespace std;

void move(char formalMatrix[3][3]);		// places x on the tic tac toe board
// arrays are passed by simulated reference (aka address) even though the 
//    address-of operator (&) isn't used in the parameter list

int main()                                              
{
	char matrix[3][3];			// 3 by 3 tic tac board
	int row;                              // row of tic tac toe board
	int col;                              // column of tic tac toe board

	for(row = 0; row < 3; row++)		  // assigning X's to all positions
	{
		for(col = 0; col < 3; col++)		
		{
			matrix[row][col] = 'X';
		}
	}
	
	move(matrix);                         // placing 0 in middle

	//********* displaying tic tac toe board ***********

	for (row = 0; row < 3; row++)		
	{
		for(col = 0; col < 3; col++)
		{
			cout << matrix [row][col] << ' ';  	// printing each row 
		} 

		cout << endl;							// wrapping to next row
	}
	
	cout << endl << endl;
	
	return 0;
}// end of main

void move(char formalMatrix[3][3])
{

        formalMatrix[1][1] = 'O';   // assigning 0 to middle square of board
		// since matrix was passed by simulated reference (or address)
		//   this assignment affects the passed argument (matrix) in the
		//   main function

}// end of move