scalar变量将以美元符号($)开头,它可以存储数字,字符串或引用。array变量将以符号@开头,它将存储有序的标量列表。 最后,Hash变量将以符号%开头,并将用于存储键/值对的集合。 Perl将每个变量类型保存在单独的命名空间中。 因此,您可以在不担心冲突的情况下,为标量变量,数组或散列使用相同的名称。 这意味着$ foo...
# add one element at the beginning of the array unshift(@coins, "Dollar"); print "3.\@coins =@coins\n"; # remove one element from the last of the array. pop(@coins); print "4.\@coins =@coins\n"; # remove one element from the beginning of the array. shift(@coins); print "...
1 前言 XS是Perl与C的胶水语言,通过它能在Perl中创建方法,以此扩展C库中的函数或新定义的C函数,详情可参阅《官方手册:perlxs》。 XS的编译器叫做xsubpp,它用typemaps去决定如何映射C函数的参量和输出值到Perl的值中并返回。“XSUB结构(XSUB forms)”是XS接口的基本单元,一个XSUB被编译后等效于一个C函数,其...
while (@array) { my $firstTotal = shift(@array); print "@array\n"; } output: 2 3 4 5 6 3 4 5 6 4 5 6 5 6 6 4、unshift #!/usr/bin/perl ###<unshift>### use strict; use warnings; my @array = (); for ( myi=1;i <= 5; ++$i ) { unshift( @array,i ); # a...
my $worksheet = $workbook->add_worksheet(); # 写入标题 $worksheet->write('A1', 'Name'); $worksheet->write('B1', 'Age'); $worksheet->write('C1', 'City'); # 写入查询结果 while (my $row = $sth->fetchrow_arrayref()) {
EN在进行字符串处理和文本分析时，有时我们需要从字符串列表中删除特殊字符。特殊字符可能是空格、标点...
$value3=addem2,2; print"2+2=$value3\n"; subaddem { ($value1,$value2)=@_; return$value1+$value2; } #方法二:在使用子程序之前定义子程序: subaddem { ($value1,$value2)=@_; return$value1+$value2; } print"2+2=".addem2,2; ...
$worksheet->write('A14', \@array ); # write_row() $worksheet->write('A15', [\@array] ); # write_col() $format参数是可选的,用于定义单元格的格式,如下: my $format = $workbook->add_format(); $format->set_bold(); #加粗
@array=(1,2,3); $ref=\@array; push(@$ref,4); #@array==(1,2,3,4) 5.2.3 -> #与C类似,二元操作符->是一个中缀析值操作符 ~~~ 1. 如果右边是一个[...]数组脚标、一个{...}散列脚标或者一个(...)子例程参数列表,那么左边必须是一个对应的数组、散列或子例程的引用(硬应用或符号引...
If you apply one of them to an array or a hash, it will convert the array or hash to a scalar value (the length of an array, or the population info of a hash) and then work on that scalar value. This is probably not what you meant to do. See "grep" in perlfunc and "map"...