# Torbert 9.7.2007

def find_sum(ex)
  total = 0;
  for term in ex do
    total += term;
  end
  return total;  # or just: total
end

def main()
  puts();
  print("Enter some arithmetic, addition of positive numbers only: ");
  expression = gets();
  puts();
  puts(expression.inspect());
  expression = expression.chomp();
  puts(expression.inspect());
  expression = expression.split("+");
  puts(expression.inspect());
  for k in 0..expression.length()-1 do
    expression[k].strip!();
  end
  puts(expression.inspect());
  for k in 0...expression.length() do ## Note the 3 periods, stop 1 short
    expression[k] = expression[k].to_i();
  end
  puts(expression.inspect());
  puts();
  sum = find_sum(expression);
  puts("The sum is #{sum}");
  puts();
  for k in 0...expression.length() do
    expression[k] = expression[k].to_s();
  end
  puts("#{expression.join(" + ")} = #{sum}");
  puts();
end

main();