1.2.1.5-pcep-30-02-practice-test-compendium-operators.md

1.2.1.5 PCEP-30-02 Practice Test Compendium – Operators

String operators (ordered according to descending priorities)

The rules governing the use of operators and parentheses remain the same, and left-sided binding is in effect.

Priority	Operator	Name	Example	Result	Result type
Highest	*	Replication	'a' * 3 3 * 'a'	'aaa'	Always a string
Middle	+	Concatenation	'a' + 'z' 'z' + 'a'	'az' 'za'	Always a string

Boolean operators (ordered according to descending priorities)

Boolean operators demand Boolean arguments, and always result in a Boolean result. The rules governing the use of operators and parentheses remain the same, including left-sided binding.

Priority	Operator	Name	Example	Result
Highest	not	negation	not false	True
			not True	False
Middle	and	conjunction	False and False	False
			False and True	False
			True and False	False
			True and True	True
Lowest	or	disjunction	False or False	False
			False or True	True
			True or False	True
			True or True	True

Relational operators

Relational operators compare their arguments to diagnose the relationship between them, and always return a Boolean value indicating the comparison result.

Operator	Name	Example	Result
==	equal to	2 == 1	False
!=	not equal to	2 != 1	True
>	greater than	2 > 1	True
>=	greater or equal	2 >= 1 1 >= 1	True True
<	less than	2 < 1	False
<=	less or equal	2 <= 1 1 <= 1	False True