打包/解压 - litle endian - 64位 - 问题

Question

#!/usr/bin/env perl
use warnings;
use 5.012;

my $var = 1 << 31;
say unpack( "B*", pack( "N", $var )  );

# 10000000000000000000000000000000

我怎样才能打包/打包

my $var = 1 << 63;

像这样的输出？

# 1000000000000000000000000000000000000000000000000000000000000000

Answer 1

say unpack("B*", pack( "Q>", $var ));

该>部队在大端字节顺序Q(64位无符号"四")类型.