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example name result?/FONT> $a and $b And True of both $a and $b are true.?/FONT> $a or $b Or?/FONT> True if either $a or $b is true.?/FONT> $a xor $b Or?/FONT> True if either $a or $b is true, but not both.?/FONT> ! $a Not?/FONT> True if $a is not true.?/FONT> $a && $b And?/FONT> True of both $a and $b are true.?/FONT> $a || $b Or?/FONT> True if either $a or $b is true. 两种不同“and”和“or”操作符的变化实际上是由于操作的不同优先级别而造成的。（参考以下内容。） |