perl双层哈希求长度
my $size=scalar keys%hash_ref;37 print STDERR "top-level hash_ref $size\n";
38 foreachmy $key (keys %hash_ref)
39 {
40 $size=scalar keys%{$hash_ref{$key}};
41 print STDERR "second-level hash_ref $size\n";
42
43 }
44 foreach my $key (keys %hash_ref)
45 {
46 foreach my $subkey (keys %{$hash_ref{$key}})
47 {
48 print STDERR "$key\t$subkey\n";
49
50 }
51 }
字符串数组相关:
use strict;
use warnings;
my $asc=ord("我");
my $val=$asc & 0x80;
print "$asc\n";
print "$val\n" ;
my $line="我是中国人";
my $lenline= length $line;
my @vec =split //,$line;
my $size= scalar @vec;
print "字符串的长度是 $lenline 数组的长度为$size\n" ;
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