21: Point game, command line, and face image process. Ruby

Blackjack game, command line, face image process.
Try ruby in the future.
# this is game 21 point
# Operation command symbol No operation, n next step, draw cards; w show card ends;
$ ope = ''
$ prompt = '>'
$ x1 = 0
$ x2 = 0
$ x3 = 0
$ pc = 0
$ u1 = 0
$ u2 = 0
$ u3 = 0
$ over = ''

def out_main (a = 0, b = 0, c = 0, pc = 0, us1 = 0, us2 = 0, us3 = 0)
  puts "21 point Game"
  puts "-wide288 author"
  puts
  puts "PC is keys"
  if pc == 0
    puts "* * *"
  else
    puts "% d% d% d"% [a, b, c]
  end

  puts
  puts "user is keys"
  puts "% d% d% d"% [us1, us2, us3]
  puts Time.new
  puts "n draw cards; w show cards; l admit defeat; x quit;"
end

#Main thread running
def main ()
  while $ ope! = 'x'
    system 'clear'
    out_main ($ x1, $ x2, $ x3, $ pc, $ u1, $ u2, $ u3)
    if 'w'! = $ ope
      print $ prompt
      $ ope = STDIN.gets.chomp ()
    end
    if 'x' == $ ope
      break
    end
    if 'l' == $ ope
      puts "I throw up."
      break
    end
    if 'n' == $ ope
      number = rand (1..10)
      if 0! = number
        puts number
        if $ x1 == 0
          $ x1 = number
        elsif $ x2 == 0
          $ x2 = number
        elsif $ x3 == 0
          $ x3 = number
        end
      end

      number = rand (1..9)
      if 0! = number
        puts number
        if $ u1 == 0
          $ u1 = number
        elsif $ u2 == 0
          $ u2 = number
        elsif $ u3 == 0
          $ u3 = number
        end
      end
    end

    if 'w' == $ ope
      #system "clear"
      $ pc = 1
      pcsum = 21-($ x1 + $ x2 + $ x3)
      usersum = 21-($ u1 + $ u2 + $ u3)
      puts "% d% d% d pc sum is-21 =% d"% [$ x1, $ x2, $ x3, pcsum]
      puts "% d% d% d user sum is-21 =% d"% [$ u1, $ u2, $ u3, usersum]
      if usersum> = pcsum
        puts "pc win"
      else
        puts "User Win !!!"
      end
      #out_main ($ x1, $ x2, $ x3, $ pc, $ u1, $ u2, $ u3)
      break
    end
  end
end

# main thread run
main ()