tic-tac-toe.rb

$board = {}
$turn = 0
def main()
	# display board
	# player 1 select input
	# display board
	# player 2 select input
	until $turn >= 9
		showBoard()
		input = getInput()
		fillSquare(input, $turn)
		$turn+=1
	end

end
def getInput()
	input = -1
	until input >= 0 && input < 9
		begin
			puts "Please select a square [0-8]"
			input = Integer(gets)  
		rescue
			puts "Please insert only the position you wish the select [0-8]"
			input = -1
		end
	end
	return input
end

def fillSquare(index, turn)
	$board[index] = turn % 2
end

def showSquare(index)
	if $board[index].nil? 	
		return index
	end
	return $board[index] === 1 ? "X" : "O"
end

def showBoard()
    puts "-------------"
    puts "| #{showSquare(0)} | #{showSquare(1)} | #{showSquare(2)} |"
    puts "-------------"
    puts "| #{showSquare(3)} | #{showSquare(4)} | #{showSquare(5)} |"
    puts "----------"
    puts "| #{showSquare(6)} | #{showSquare(7)} | #{showSquare(8)} |"
    puts "-------------"
end

main()