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#!/usr/bin/perl
 
$a = 20;
# 使用 unless 语句检测布尔表达式
unless( $a  ==  30 ){
    # 布尔表达式为 false 时执行
    printf "a 的值不为 30\n";
}elsif( $a ==  30 ){
    # 布尔表达式为 true 时执行
    printf "a 的值为 30\n";
}else{
 
 
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Snippet Metadata
Owner	w3xue
Created	2 years ago
Modified	2 years ago
Visibility	Public