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                # Perl 中的`given-when-default`語句 > 原文: [https://beginnersbook.com/2017/02/given-when-default-statement-in-perl/](https://beginnersbook.com/2017/02/given-when-default-statement-in-perl/) 正如我在[上一篇文章](https://beginnersbook.com/2017/02/switch-case-in-perl/)中所討論的那樣,`switch-case`在 Perl 5 中被棄用。三個新關鍵字:`given-when-default`在 Perl 5 中引入,提供類似于`switch case`的功能。 #### 語法: ```perl given (argument) { when (condition) { statement(s); } when (condition) { statement(s); } when (condition) { statement(s); } . . . default { statement(s); } } ``` #### 例: ```perl #!/usr/local/bin/perl use v5.10; no warnings 'experimental'; printf "Enter any number:"; $num = <STDIN>; given($num){ when ($num>10) { printf "number is greater than 10\n"; } when ($num<10) { printf "number is less than 10\n"; } default { printf "number is equal to 10\n"; } } ``` **輸出:** ```perl Enter any number:10 number is equal to 10 ```
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