A little division script for Discrete Math.

division.rb

a = ARGV[0].to_i
d = ARGV[1].to_i

begin
  raise '`a` (first argument) must be a non-negative integer' unless a >= 0
  raise '`d` (second argument) must be a positive integer' unless d > 0
rescue Exception => e
  puts "Error: #{e.message}"
  Process.exit
end

r = a
q = 0
counter = 0

puts "\n"
loop do
  puts "Counter: #{counter}; r: #{r}; q: #{q}"
  break if r < d
  r -= d
  q += 1
  counter += 1
end

puts "\nInput:   a: #{a}; d: #{d}"
puts "Output:  q: #{q}; r: #{r}\n\n"