cash.rb

puts "What is the amount due?"
amt_due = gets.to_f
puts "What is the amount tendered?"
amt_tnd = gets.to_f

if amt_tnd == amt_due
  puts "========== Thank You! ============"
  puts Time.now.strftime("%m/%d/%Y %l:%M")
  puts "=================================="
else
  change = amt_tnd - amt_due
  tender = sprintf('%.2f', change.abs)
  if change > 0
    puts "========== Thank You! ============"
    puts "The total change due is $#{tender}"
    puts Time.now.strftime("%m/%d/%Y %l:%M")
    puts "=================================="
  else
    puts "==================================================="
    puts "WARNING: Customer still owes $#{tender}! Exiting..."
    puts "==================================================="
  end
end