Ruby - print multiplication chart

mult_chart.rb

# Prints out a multiplication chart
# whipped this to show my 8 year old daughter how cool programming is...
#           1    2    3    4    5    6    7    8    9
#       ---------------------------------------------
#    1 |    1    2    3    4    5    6    7    8    9
#    2 |    2    4    6    8   10   12   14   16   18
#    3 |    3    6    9   12   15   18   21   24   27
#    4 |    4    8   12   16   20   24   28   32   36
#    5 |    5   10   15   20   25   30   35   40   45
#    6 |    6   12   18   24   30   36   42   48   54
#    7 |    7   14   21   28   35   42   49   56   63
#    8 |    8   16   24   32   40   48   56   64   72
#    9 |    9   18   27   36   45   54   63   72   81
	
def print_header(l)
	print "       "
	(1...l).each {|i| print "%5s" % i	}
	print "\n       "
	(1...l).each {|i| print "-----"}
end

upper_limit = 10
print_header(upper_limit)
(1...upper_limit).each do |i|
	print "\n%5s |" % i
	(1...upper_limit).each do |j|
		print "%5s" % (i*j)
	end
end