These rules are listed in the table in the column named Order of Evaluation. The other columns in the table are described here. Symbols lists the actual symbols that you use to request the comparisons, operations, and calculations. Mnemonic Equivalent lists written-out, alternate forms of the symbol. In some cases, such as when your keyboard does not support special symbols, you should use the alternate form.
Definition defines the symbol.
Example provides brief examples of how to use the symbol or mnemonic equivalent in a SAS expression. A plus or a minus sign is a prefix operator only when it appears at the beginning of an expression or when it is immediately preceded by a left parenthesis or another operator. This is because Group I operators are evaluated from right to left. Group V operators are comparison operators. The result of a comparison operation is 1 if the comparison is true and 0 if it is false.