Ruby 循环

#   E3.10-1.rb
a=1
   while a <10
  print a," " ;  a=a+1 ;  end
#1 2 3 4 5 6 7 8 9 


#   E3.10-2.rb

a=1
 until a >=10
  print a," " ;  a=a+1 ;end
  #1 2 3 4 5 6 7 8 9 

#   E3.10-3.rb
for i in 1..9
  print i," "
end
#1 2 3 4 5 6 7 8 9