欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

两段Perl脚本代码(数组应用与say用法)

程序员文章站 2022-10-08 09:17:51
一、数组应用复制代码 代码如下:#!/usr/bin env perl@zeng = `top -b -n 1`;foreach (@zeng) {print "$_\n"...
一、数组应用
复制代码 代码如下:

#!/usr/bin env perl
@zeng = `top -b -n 1`;
foreach (@zeng) {
print "$_\n";
}

二、say的用法:自动换行
复制代码 代码如下:

#!/user/bin env perl
use 5.010; #表示使用perl 5.10的版本。
say "hello world!";
my @fred = above_average(1..10);
print "\@fred is @fred\n";
print "(should be 6 7 8 9 10)\n";
my @barney = above_average(100, 1..10);
print "\@barney is @barney\n";
print "(should be just 100)\n";
sub average {
  if (@_ == 0) { return }
  my $count = @_;
  my $sum = total(@_);
  $sum/$count;
  }

  sub above_average {
    my $average = average(@_);
    my @list;
    foreach my $element (@_); {
     if ($element > $average) {
        push @list, $element;
    }
  }
  @list;
  }

复制代码 代码如下:

#!/usr/bin/perl -w
use 5.010;
greet( 'fred');
greet( 'barney');
sub greet {
  state $last_person;
  my $name = shift;
  print "hi $name!";
  if ( defined $last_person ) {
    print "$last_person is also here!\n";
    }
    else {
        print "you are the first one here!\n";
        }
        $last_person = $name;
        }
greet( 'fred' );
greet( 'barney' );
greet( 'wilma' );
greet( 'betty' );
sub greet {
    state @names;
    my $name = shift;
    print "hi $name!";
    if ( @names ) {
        print "i've seen: @names\n";
        }
    else {
        print "you are the first one here!\n";
        }
        push @names, $name;
        }