1. Postfix expressions are evaluated according to the following rules: a. Scan the expression from left to right. b. If an operator is found, back up to get the required number of operands, evaluate...

1. Postfix expressions are evaluated according to the following rules:

a. Scan the expression from left to right.

b. If an operator is found, back up to get the required number of operands, evaluate the operator, and continue.

2. A queue is a data structure in which the items are added at one end and removed from the other end.