*数组空：标量上下文中的@array一直都很有效，它会告诉你数组是否为空。
*数组空：标量上下文中的@array一直都很有效，它会告诉你数组是否为空。
Perl 诊断消息 类别含义 (W)警告(可选) (D)反对(可选) (S)严重警告(必需) (F)致命错误(可捕获) (P)你应该从未见过的内部错误(恐慌性的)(可捕获) (X)非常致命的错误(不可捕获) (A)外来错误消息(不是Perl生成的)
/usr/bin/perl&gotest("/home/macg/perltest/gogo");&gotest("/home/macg/www/index.html");&gotest("jk");subgotest{my(@tmp)=@_;open(MYFILE,$tmp[0]) ||die("Could not open file");@array= <MYFILE>; 此句不是读一行,而是读整个文件foreach(@array) {print$_;...
问将xls转换为xlsx的Perl脚本正在生成空白xlsx和错误消息。EN执行下面的perl脚本将xls转换为xlsx，但是它...
Looks OK, after it's been through the syntax check (perl -c scriptname), we run it and all we get is a blank line again! Hmmmm. 上面的代码运行后只会得到一个空行。 One common debugging approach here, would be to liberally sprinkle a few print statements, ...
A named array in scalar context is quite different from what would at first glance appear to be a list in scalar context. You can't get a list like "(1,2,3)" into being in scalar context, because the compiler knows the context at compile time. It would generate the scalar comma ...
This is the same value as what the "pos" function returns when called on the variable that was matched against. The nth element of this array holds the offset of the nth submatch, so $+[1] is the offset past where $1 ends, $+[2] the offset past where $2 ends, and so on. ...
if ($str1 eq $str2) { print "Both strings are equal.\n"; } 3.8. 多行字符串 my $text =qq{ This is a multiline string. }; 3.9. split和join函数 split 函数是 Perl 中用于将字符串分割成数组的主要工具。 基本语法: @array = split(/PATTERN/, $string); PATTERN:正则表达式,定义如何分割...
$string="This,is,a,csv,file";@array=split(/,/,$string);# split the string by comma using regular expressionprint“@array”;# prints This is a csv file$string=“Helloworld”;@array=split(//,$string);# split the string by each character using empty patternprint“@array”;# prints H ...