[Float] a
[String = ((Float, Float) -> Float)] b
b[‘+’] = (x, y) -> y + x
b[‘-’] = (x, y) -> y - x
b[‘*’] = (x, y) -> y * x
b[‘/’] = (x, y) -> y / x
b[‘^’] = (x, y) -> y ^ x

L(c) ‘3 4 2 * 1 5 - 2 3 ^ ^ / +’.split(‘ ’)
   I c C b
      V first  = a.pop()
      V second = a.pop()
      a.append(b[c](first, second))
   E
      a.append(Float(c))
   print(c‘ ’a)