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Thinking, Express

测验题目

问题：

In Perl, we can write following code:

$b = $a;
$b =~ s/m/n/;

What does above code mean？
How to write above code in one statement?

参考答案：

It means first make a copy of $a into variable $b, and then replace 'm' with 'n' in
variable $b.

Write it in one statement like below:

($b=$a) =~ s/m/n/;

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