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Дата изменения: Sun Feb 3 22:33:30 2002 Дата индексирования: Mon Oct 1 22:52:52 2012 Кодировка: |
Table 10-5. Logical Operators
Example | Name | Result |
---|---|---|
$a and $b | And | TRUE if both $a and $b are TRUE. |
$a or $b | Or | TRUE if either $a or $b is TRUE. |
$a xor $b | Xor | TRUE if either $a or $b is TRUE, but not both. |
! $a | Not | TRUE if $a is not TRUE. |
$a && $b | And | TRUE if both $a and $b are TRUE. |
$a || $b | Or | TRUE if either $a or $b is TRUE. |
The reason for the two different variations of "and" and "or" operators is that they operate at different precedences. (See Operator Precedence.)