# Exception < Object

begin
  puts "starting"
  todo                      # not a method
  puts "ending"             # does not get here
rescue NameError            # predefined exception
  puts "oops: " + $!        # $! has the error message
ensure
  puts "always do this"     # always do this
end

begin
  puts "input 10 characters or less"
  s = gets
  raise "too many" if s.length > 10  # generates exception
  puts "good entry"                  # only here if good
rescue RuntimeError                  # type generated
  puts "you entered too many characters"
end

catch(:stop) do                      # labels a block
  for x in 1..10
     y = x*x
     for z in 1..10
       print x," ",y," ", z, "\n"
       throw :stop if z > y          # go to end of
     end                             # labeled block
  end
end