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                # Perl 中的`unless`語句 > 原文: [https://beginnersbook.com/2017/02/unless-statement-in-perl/](https://beginnersbook.com/2017/02/unless-statement-in-perl/) perl 中的`unless`語句與 perl 中的[`if`語句正好相反。當給定條件為假時,它執行其體內的語句集](https://beginnersbook.com/2017/02/if-statement-in-perl/)。 ```perl unless(condition) { statement(s); } ``` `unless`正文內的語句在條件為假時執行。 #### 例 ```perl #!/usr/local/bin/perl printf "Enter any number:"; $num = <STDIN>; unless($num>=100) { printf "num is less than 100\n"; } ``` **輸出:** ```perl Enter any number:99 num is less than 100 ```
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