title: Valuate complex number expressions
body: <p>For valuate arithmetic expression I use the Donal Knuth algorithm, which convert the expression to postfix and the use the postfix stack to resolve the expression. I'm wondering, there is something similar for complex number expressions?</p>
  
  <p>Something which can do for example: ((2+8i)*(12+3i)^(1/2))/34+21i</p>