(1 + (2 * (3 - 5)))
This expression can be represented using an
expression tree:
(+ 1 (* 2 (- 3 5)))
Since the operator precedes the operands, we
say the expression is in prefix form.
The corresponding expression in infix form:
(1 + (2 * (3 - 5)))
This expression can be represented using an
expression tree: