Ruby Start

=begin
D:\>ruby a.rb
1*1=1
1*2=2  2*2=4
1*3=3  2*3=6  3*3=9
1*4=4  2*4=8  3*4=12 4*4=16
1*5=5  2*5=10 3*5=15 4*5=20 5*5=25
1*6=6  2*6=12 3*6=18 4*6=24 5*6=30 6*6=36
1*7=7  2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49
1*8=8  2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64
1*9=9  2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81
-------------------------------------------------------------------
input a number (1 - 10):
3
         *
      *      *
   *            *
*                  *
   *            *
      *      *
         *
=end

for i in 1..9
	for j in 1..i
		print j, "*", i, "=", i * j, (i * j < 10 ? "  " : " ")
	end
	puts
end

puts "-------------------------------------------------------------------"

puts "input a number (1 - 10):"
width = gets.to_i
i, j = width, 0
while i.abs <= width
	print "   " * i.abs, "*", "   " * j, (j > 0 ? "*\n" : "\n")
	i -= 1
	i >=0 ? j += 2 : j -= 2
end