battleship.rb

grid = [
  [0,0,0],
  [0,0,0],
  [0,0,0]
]

ships = [
  [ [0,0],[0,1] ],
  [ [1,2],[2,2] ]
]

grid.each_with_index do |row, index|
  puts " "
  row.each_with_index do |space, col|
    marker = ' * '
    ships.each do |ship|
      ship.each do |coord|
       if coord == [col, index]
	 marker = " S "
       end
      end
    end
    print "#{marker}"
  end
  puts " " 
end