Data Structures and Algorithms
with Object-Oriented Design Patterns in Java 
The algebraic expression in Equation 
is written in the usual way such mathematical expressions are written.
The notation used is called infix notation
because each operator appears in between its operands.
As we have seen,
there is a natural relationship between infix notation and inorder traversal.
Infix notation is only possible for binary operations
such as addition, subtraction, multiplication, and division.
Writing an operator in between its operands is possible only
when it has exactly two operands.
In Chapter we saw two alternative notations
for algebraic expressions--prefix and postfix.
Copyright © 1998 by Bruno R. Preiss, P.Eng. All rights reserved.