在Perl中，如何使用sprintf将零填充到可变长度? [英] How do I use sprintf to zero fill to a variable length in Perl?

问题描述

我想使用Perl的 sprintf 来对变量进行零填充.

I want to use Perl's sprintf to zerofill a variable.

sprintf("%08d", $var);

但是我想动态确定要填零的位数.

But I want to dynamically determine how many digits to zerofill.

如何用名为$zerofill的变量替换sprintf("%08d", $var)中的"8"?

How do I replace the "8" in sprintf("%08d", $var) with a variable called $zerofill?

推荐答案

sprintf的第一个参数只是一个字符串:

 my $zerofill = 9;
 my $number = 1000;
 my $filled = sprintf "%0${zerofill}d", $number;

请注意用大括号将变量名与字符串的其余部分区分开.

Notice the braces to set apart the variable name from the rest of the string.

在学习Perl 时，我们会遇到一个特殊的问题，即提醒人们该字符串是只是字符串. :)

We have this particular problem as a slightly clever exercise in Learning Perl to remind people that strings are just strings. :)

但是，作为

However, as mobrule points out in his answer, sprintf has many features to give you this sort of flexibility. The documentation for such a seemingly simple function is quite long and there are a lot of goodies in it.

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