- Logical Expressions

Logical expressions combine relational expressions and logical operators.

Logical operators are as follows:

Operator	Example	Result
AND	A AND B	True if both A and B are True

OR	A OR B	True if either A or B is True True if both A and B are True

NOT	NOT (A AND B)	True if (A AND B) is False False if (A AND B) is True
	NOT (A OR B)	True if (A OR B) is False False if (A OR B) is True
	NOT (A = B)	True if (A = B) is False False if (A = B) is True
	NOT (A < B)	True if (A < B) is False False if (A < B) is True
	NOT (A > B)	True if (A > B) is False False if (A > B) is True
	NOT (A <= B)	True if (A <= B) is False False if (A <= B) is True
	NOT (A >= B)	True if (A >= B) is False False if (A >= B) is True

For >, <, >=, and <= comparisons, PROIV performs a NOT conversion on the relational operator (for example, > becomes <= and <= becomes >) and then evaluates the logical expression.

When evaluating expressions that contain more than one operator, PROIV follows precedence rules to determine the order in which operations are performed. An operation with higher precedence is evaluated before an operation with lower precedence. Parentheses can be used to alter the normal precedence.

Operator	Precedence
NOT	Highest
AND
OR	Lowest

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Topic ID: 520008