Perl中的if语句,if语句包含条件,后跟一个语句或一组语句,如下所示: if(condition){Statement(s);} Perl 只有在给定条件为真时才会执行语句。如果条件为false,那么if语句体内的语句将被完全忽略。 Perl 中的if语句 在以下示例中,我们将一个整数值赋给变量num。使用if语句,我们检查分配给num的值是否小于 100。
这个Perl程序哪里错了? 1 /usr/bin/perl -w 2 use strict; 4 if ( priceInDollars = 100; 行数别理它,有点乱 答案 如果说错的话,就是第4行的if语句,在对priceInDollars赋值以前(第11行)就使用了.因此,在if语句中,priceInDollars的值是undef,实际取值是0,所以4~10行的语句永远输出:I can afford...
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if (Perl in a Nutshell, 2nd Edition)Stephen Spainhour
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这个Perl程序哪里错了?1 /usr/bin/perl -w2 use strict;4 if ( $priceInDollars >=100 ) { 6 print "This item is too expensive!\n";7 }8 else {9 print "I can afford this.\n";10 }11 my $priceInDollars = 100;行数别理它,有点乱...
"Function" and "Sub" ProceduresBuilt-in FunctionsInspecting Variables Received in ProceduresError Handling Flag and the "Err" ObjectRegular Expression Pattern Match and Replacementscrrun.dll - Scripting Runtime DLL LibraryCreating Your Own Classes
else if in Perl Please also note that the spelling of the "else if" construct has the most diversity among programming languages. In Perl it is written in one word with a single 'e':elsif. Empty block Though usually it is not necessary, in Perl we can also have empty blocks: ...
答案当然是否定的,接口的意义本身就是定义一个契约让实现类来实现,如果定义了final关键字,那么接口的意义就不存在了,所以从语言层面来说接口以及接口中的方法就不能使用final关键字。...Fatal error: Access type for interface method C::testC() must be omitted final function testC(); } 在Java...中,...
然后进行条件判断。如果服务开启,输出当前时间 + httpd is ok 到 / tmp/autostart-acc.log。 如果变量 port 的值不是 open,那么执行 else 下操作。首先启动 apache 服务,将启动后 信息输出至位桶,然后在 / tmp/autostart-err.log 中记录。在本次脚本中 nmap 命令使用的是 ...