二维数组问题

陈卓文

#!/usr/bin/perl
@list_of_lists=(
        [qw( mustang bronco ranger)],
        [qw( cavalier suburban buick)],
        [qw( lebaron ram a)],
        [qw( x b c)],
        );


print "$#{$list_of_lists[1]}\n";

$A=scalar(@{$list_of_list[2]});
print "$A\n";


请问$# , scalar这两行分别返回的是什么?如果改变里面的数组对应返回的是什么?

jason680

回复 1# 陈卓文

$ perldoc -f scalar
    scalar EXPR
            Forces EXPR to be interpreted in scalar context and returns the
            value of EXPR.
    ...


$ perldoc perldata
NAME
    perldata - Perl data types

    ...

    Scalar values are always named with '$', even when referring to a scalar
    that is part of an array or a hash. The '$' symbol works semantically like
    the English word "the" in that it indicates a single value is expected.

        $days               # the simple scalar value "days"
        $days[28]           # the 29th element of array @days
        $days{'Feb'}        # the 'Feb' value from hash %days
        $#days              # the last index of array @days