input number with rack

gistfile1.rb

# input_number.rb
def input_response(n)
  answer = ""
  if n > 0
    answer = "positive"
  elsif  n < 0
    answer = "negative"
   else n == 0
     answer = "zero"
   end
  return answer
end

error = false
n = ARGV[0].to_i

def check_input
  if ARGV.length < 1 || ARGV.length > 1
    error = true
  elsif
    begin
      n = Integer(ARGV[0])
    rescue ArgumentError
      error = true
    end
  end
  return error
end

my_rack_proc = lambda { |env| [200, {"Content-Type" => "text/plain"},
[check_input == true ? "Please, enter an integer as argument" :"The number you entered on the command line is " + input_response(n)]]}
puts my_rack_proc.call({})

Nice.

def check_input
if ARGV.length < 1 || ARGV.length > 1
error = true
elsif #=> should be else not elsif
begin
n = Integer(ARGV[0])
rescue ArgumentError
error = true
end
end
return error
end