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                # Perl 中的`until`循環 > 原文: [https://beginnersbook.com/2017/02/until-loop-in-perl-with-example/](https://beginnersbook.com/2017/02/until-loop-in-perl-with-example/) 直到循環行為與 perl 中的循環的正好相反,只要條件為真`while`循環繼續執行。在[`until`循環](https://beginnersbook.com/2017/02/while-loop-in-perl-with-example/)。中,只要條件為假,循環就會執行 #### `until`循環的語法: ```perl until(condition) { statement(s); } ``` ### 執行直到循環的流程 首先評估條件,如果返回`false`,則循環內的語句被執行。執行后,重新評估條件。這一直持續到條件返回`true`。一旦條件返回`true`,控制流就會轉到循環之后的下一個語句。 #### 例 ```perl #!/usr/local/bin/perl $num = 10; until( $num >15 ){ printf "$num\n"; $num++; } ``` **輸出:** ```perl 10 11 12 13 14 15 ```
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