使用Perl,不使用任何不带ActivePerl的额外模块,如何从0-F创建一个包含8个字符的字符串.例如0F1672DA？填充应该是可控的,最好是8个字符.
我想要生成的字符串种类的更多示例：
28DA9782 55C7128A
解决方法
原则上,你应该能做到
#!/usr/bin/env perl
use strict; use warnings;
for (1 .. 10) {
printf "%08X\n",rand(0xffffffff);
}
但是,您可能会发现 – 至少在某些系统上有一些perls(如果不是全部) – range of rand is restricted to 32,768 values.
您还可以学习String::Random的源代码,以了解如何生成满足其他条件的随机字符串.
但是,我不建议在Windows系统上使用内置兰特.有关高质量RNG,请参阅Math::Random::MT.
#!/usr/bin/env perl
use strict; use warnings;
my @set = ('0' ..'9','A' .. 'F');
my $str = join '' => map $set[rand @set],1 .. 8;
print "$str\n";
PS：The issue with Perl’s rand on Windows was fixed in 5.20：
This meant that the quality of perl’s random numbers would vary from platform to platform,from the 15 bits of rand() on Windows to 48-bits on POSIX platforms such as Linux with drand48().
Perl now uses its own internal drand48() implementation on all platforms. This does not make perl’s rand cryptographically secure. [perl #115928]