gistfile1.txt

require './calculator_class'

puts "Enter numbers divided by spaces"

begin
  # chop is used to get rid of '\n' new char line that's the last one in gets when finishing line input
  numbers = gets.chop.split.grep(/-?\d+/) do |possible_num|
    begin
      # unlike to_i, Integer throws exception if input is somehow invalid (letters, etc)
      Integer(possible_num)
    rescue
      nil
    end
  end # getting array of integers with occasional nils
  if numbers.length != numbers.compact.length # in case there're nils
    puts "Please enter a valid input"
    redo
  end
  if numbers.count < 2
    puts "Please enter 2 or more numbers"
    redo
  end
  puts 'numbers are ', numbers.inspect
end while false

cl = Calculator.new(numbers)

puts "Result of adding: #{cl.plus}"

puts "Result of subtraction: #{cl.minus}"

cl.clear