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问题描述：

你好，
我决定学习一些Perl，并通过Nik Silver找到了本教程: http://www.comp.leeds.ac. uk/Perl/ [ ^ ].在控制结构练习中，我解决了第一部分:在每行之前放置一个行号，但是我不知道如何解决第二部分:在前面放置一个3位数字每行. 有人有什么想法吗?

真诚的
Mike

Hello,
I decided to learn some Perl and I found this tutorial by Nik Silver: http://www.comp.leeds.ac.uk/Perl/[^]. In the Control Structures exercise, I solved the first part: putting a line number before each line, but I don''t know how to solve the second part: putting a 3-digit number before each line. Does anyone have any ideas?

Sincerely,
Mike

答

如果您可以展示尝试过的方法，那会很好，但是如果没有这样做，我想您可能需要做的只是查找，并使用%03d之类的格式.假设您已经安装了不错的Perl，使用perldoc -f sprintf应该可以在命令行中找到所需的所有内容.请注意，sprintf和printf使用相同的格式代码，如果您完全了解C，他们应该非常熟悉.

一种替代方法是使用Perl的format工具，该工具功能非常强大，但在当今的HTML等中几乎未使用.过去，我已经使用它进行了一些漂亮的文本格式化，以生成报告，如果您使用的是简单文本，则可能值得一看.

欢呼！
Don

It would be good if you would show what you have tried, but in absence of that, I think all you likely need to do is look up printf, and use a format like %03d. Assuming you have a decent Perl installation, you should be able to find out all you need at the command line with perldoc -f sprintf. Note that sprintf and printf use the same formatting codes, and if you know C at all they should be very familiar.

An alternative would be to use Perl''s format facility which is quite powerful, but mostly unused in these days of HTML and so on. I have done some pretty fancy text formatting with it in the past for report generation, and if you''re working in simple text it may be worth a look.

cheers!
Don

这里是一个打印行号的程序:

Here is a program that prints line numbers:

file =``results.log'';
打开(INFO，

file = ''results.log'';
open(INFO,

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