Prefix expressions

prefix_expressions.rb

#Ruby Prefix expressions problem on codeeval.com

File.open(ARGV[0]).each_line do |line|
	
	# get operators using a regex

	operators = line.scan(/[*+\/]/) #return list of operators
	operators.reverse!

	# This skips over spaces as well regex here once again

	numbers = line.scan(/[^\s*+\/]/) # return list of numbers

	answer = ""
	
	numbers.each_with_index do |item, index| 
	  

      if (index == numbers.length - 1)
      	break

      elsif (index == 0 )
        
        # Do not forget about the float-division mentioned in the problem prompt
      	answer = eval(item.to_f.to_s + operators[index] + numbers[index + 1])
      	
      else
      	
      	answer = eval(answer.to_s + operators[index] + numbers[index + 1])
      	
      end
 
    end

    # All results need to be an integer
    puts answer.to_i
  
end