如果在Perl 5中打字,looks_ similar_ number,那么该数字可能也一样。 例如,
my $s = "10" + 5;
http://code>15。
是否有任何事例显示,其数字等同不一样?
在与双向经营者打交道时。 123 ^ 456 is 435, but 123” ^ “456" is x05x07x05". 两条双向操作者在数量上工作。
我只能想一想:在核实真相时。 相当于0但并非0>的指令,例如0.0>,0 but real>,0", 等所有通行证编号looks_ similar_ number,并在数字背景下评价到<0><<>>>/code>,但仍被视为真实数值。
同等数量和体力在散射钥匙上是不同的——或者更一般地说,在任何时间,我们都会增加一个增量:
my (%g, %h);
$g{ 1234000000000000 } = undef; # 1.234e+015 => undef
$h{ 1234000000000000 } = undef; # 1234000000000000 => undef
请注意,我们仍然处在Perl能够准确储存数字的范围:
> perl -e printf qq{%.f
}, 1234000000000000 + $_ for +1, 0, -1
1234000000000001
1234000000000000
1233999999999999
DB<1> sub is_num { my $x = shift; "$x " ~~ $x }
DB<2> print is_num(123)
1
DB<3> print is_num( 123 )
DB<4>
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