August 2018
Beginner to intermediate
382 pages
7h 14m
Chinese
Content preview from Perl语言入门
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44
｜
第
2
章
解决思路就是隔离。和在
shell
下的写法相同，我们可以在变量名两边加上花括号，
明确表示需要内插的变量。或者在变量名结尾断开，另外采用字符串串接操作符连
接：
$what = "brontosaurus steak";
$n = 3;
print "fred ate $n $whats.\n"; #
不是牛排，而是变量
$whats
的值
print "fred ate $n ${what}s.\n"; #
内插的是
$what
print "fred ate $n $what" . "s.\n"; #
效果同上
print 'fred ate ' . $n . ' ' . $what . "s.\n"; #
另一种折腾的写法
如果在变量名后紧跟的字符是左方括号或左花括号，请使用反斜线转义。如果
跟的是撇号或者连着的两个冒号，也请使用反斜线转义，或者直接使用花括号
隔离。之后我们会加以说明，不转义的写法还有另外的意义。
用代码点创建字符
有时候我们需要输入键盘上没有的那些字符，比如
é
，
å
，
α
或者
$barney = "fred ate a $meat"; # $barney is now "fred ate a "
You see more about this later in this chapter when we introduce the undef value.
Don’t bother with interpolating if you have ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.