# Perl 中的`if-else`语句 > 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，我们了解了 perl 中的`if`语句。在本教程中，我们将了解`if-else`条件语句。这是`if-else`语句的外观： ```perl if(condition) { Statement(s); } else { Statement(s); } ``` 如果条件为真，则`if`内的语句将执行，如果条件为假，则`else`内的语句将执行。 #### 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"; } ``` **输出：** ```perl Enter any number:120 number is greater than 100 ```