# Perl 中的`if-else`語句 > 原文： [https://beginnersbook.com/2017/02/if-else-statement-in-perl/](https://beginnersbook.com/2017/02/if-else-statement-in-perl/) 在[上一篇教程](https://beginnersbook.com/2017/02/if-statement-in-perl/)中，我們了解了 perl 中的`if`語句。在本教程中，我們將了解`if-else`條件語句。這是`if-else`語句的外觀： ```perl if(condition) { Statement(s); } else { Statement(s); } ``` 如果條件為真，則`if`內的語句將執行，如果條件為假，則`else`內的語句將執行。 #### 例： ```perl #!/usr/local/bin/perl printf "Enter any number:"; $num = <STDIN>; if( $num >100 ) { # This print statement would execute, # if the above condition is true printf "number is greater than 100\n"; } else { #This print statement would execute, #if the given condition is false printf "number is less than 100\n"; } ``` **輸出：** ```perl Enter any number:120 number is greater than 100 ```