blocks|key|1450835|text|对于实际的数学，不需要转换数字。Perl没有区分整数和浮点数(它实际上是在遮罩下进行的，但这与此无关)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1450836|如果要输出带有小数的数字，可以分别使用sprintf或printf。|offset|length|style|CODE|1450837|%25f转换正是您在这里想要的。你可以告诉它在逗号后面有小数。|1450838|printf+'%25.1f',+1000;+#+will+print+1000.0|code-block|syntax|javascript|1450839|这将尊重您的地区，并使用正确的标志逗号。|1450840|entityMap|0|LINK|mutability|MUTABLE|url|https://perldoc.perl.org/functions/sprintf|1|https://perldoc.perl.org/functions/printf^0|0|J|7|R|6|J|7|0|R|6|1|0|0|2|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]|$D|14|E|15|F|G]]|9|@$D|16|E|17|1|18]|$D|19|E|1A|1|1B]]|A|$]]|$1|H|3|I|5|6|7|1C|8|@$D|1D|E|1E|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|1F|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

For actual maths, there is no need to convert numbers. Perl doesn't make a distinction between integers and floats (it actually does under the hood, but that isn't relevant).
If you want to output a number with decimals, you can use <a href="https://perldoc.perl.org/functions/sprintf" rel="nofollow noreferrer"><code>sprintf</code></a> or <a href="https://perldoc.perl.org/functions/printf" rel="nofollow noreferrer"><code>printf</code></a> respectively.
The <code>%f</code> conversion is what you want here. You can tell it to have decimals after the comma.
<pre><code>printf '%.1f', 1000; # will print 1000.0
</code></pre>
This will respect your locale and use the correct sign for the comma.

blocks|key|1450862|text|如果您实际上是在询问如何将浮点数转换为带有小数位的十进制字符串表示形式，那么您可以使用printf/sprintf。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1450863|例如，下面的打印$x带有一个小数位，无论它是存储为整数还是浮点数的数字。|1450864|my+$x+=+1000;
printf+"%25.1f",+$x;+++#+1000.0|code-block|syntax|javascript|1450865|1450866|但是，如果您确实想按照您的要求转换为浮点数，那么就没有内置的函数可以这样做了。|1450867|Perl将在需要时自动将标量转换为浮点数(例如，当整数乘以0.1时)，因此通常不需要这样做。事实上，没有内置的机制来做这件事。|1450868|当1.0创建一个浮点数(NOK)时，您甚至不能通过乘以1.0+(使用*+0.1或*=+0.1)来获得浮点数。|1450869|$+perl+-MDevel::Peek+-e'
+++my+$x+=+1000;++++++Dump(+$x+);
+++my+$y+=+1.0;+++++++Dump(+$y+);
+++my+$z+=+$x+*+$y;+++Dump(+$z+);
'
SV+=+IV(0x55efe5c37e58)+at+0x55efe5c37e68
++REFCNT+=+1
++FLAGS+=+(IOK,pIOK)++++++<--+Signed+integer
++IV+=+1000
SV+=+NV(0x55efe5c37e98)+at+0x55efe5c37eb0
++REFCNT+=+1
++FLAGS+=+(NOK,pNOK)++++++<--+Floating+point+number
++NV+=+1
SV+=+IV(0x55efe5c37ff0)+at+0x55efe5c38000
++REFCNT+=+1
++FLAGS+=+(IOK,pIOK)++++++<--+Signed+integer
++IV+=+1000|1450870|这是你不应该做的事。|1450871|问题是，一些接口赋予了如何存储数字的意义。例如，JSON序列化程序可能会序列化以整数形式存储的数字，而不是存储为浮点数的数字。这可以被认为是一种错误。|1450872|不管是否有错误，它都不会改变您需要所请求的转换的事实。它可以使用Perl来完成。|1450873|use+Inline+C+=>+<<'__EOS__';

+++SV*+SvNV_force(+SV*+sv+)+{
++++++SvREFCNT_inc(+sv+);
++++++sv_setnv(+sv,+SvNV(+sv+)+);
++++++return+sv;
+++}

__EOS__

use+Devel::Peek+qw(+Dump+);

my+$x+=+1000;+++++++Dump(+$x+);
SvNV_force(+$x+);+++Dump(+$x+);|1450874|SV+=+IV(0x55a354e92508)+at+0x55a354e92518
++REFCNT+=+1
++FLAGS+=+(IOK,pIOK)++++++<--+Signed+integer
++IV+=+1000
SV+=+PVNV(0x55a354e611a0)+at+0x55a354e92518
++REFCNT+=+1
++FLAGS+=+(NOK,pNOK)++++++<--+Floating+point+number
++IV+=+1000
++NV+=+1000
++PV+=+0|1450875|entityMap^0|17|6|1E|7|0|8|2|0|0|0|0|T|3|0|1|3|C|3|R|3|Y|5|14|6|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1H|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|R|3|S|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]|$9|1Q|A|1R|B|C]|$9|1S|A|1T|B|C]|$9|1U|A|1V|B|C]]|D|@]|E|$]]|$1|T|3|U|5|J|7|1W|8|@]|D|@]|E|$K|L]]|$1|V|3|W|5|6|7|1X|8|@]|D|@]|E|$]]|$1|X|3|Y|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|Z|3|10|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|11|3|12|5|J|7|20|8|@]|D|@]|E|$K|L]]|$1|13|3|14|5|J|7|21|8|@]|D|@]|E|$K|L]]|$1|15|3|-4|5|6|7|22|8|@]|D|@]|E|$]]]|16|$]]

If you're actually asking how to convert a float into a decimal string representation with decimal places, then you can use <code>printf</code>/<code>sprintf</code>.
For example, the following prints <code>$x</code> with one decimal place, whether it's a number stored as an integer or float.
<pre class="lang-perl prettyprint-override"><code>my $x = 1000;
printf &quot;%.1f&quot;, $x; # 1000.0
</code></pre>
<hr />
But if you really do want to convert to a float as you asked, there is no builtin function to do this.
Perl will automatically convert a scalar to a floating point number when needed (e.g. when multiplying an integer by <code>0.1</code>), so there's normally no need for something this. In fact, there's no builtin mechanism to do it.
While <code>1.0</code> creates a float (<code>NOK</code>), you can't even get one by multiplying by <code>1.0</code> (using <code>* 0.1</code> or <code>*= 0.1</code>).
<pre class="lang-none prettyprint-override"><code>$ perl -MDevel::Peek -e'
 my $x = 1000; Dump( $x );
 my $y = 1.0; Dump( $y );
 my $z = $x * $y; Dump( $z );
'
SV = IV(0x55efe5c37e58) at 0x55efe5c37e68
 REFCNT = 1
 FLAGS = (IOK,pIOK) &lt;-- Signed integer
 IV = 1000
SV = NV(0x55efe5c37e98) at 0x55efe5c37eb0
 REFCNT = 1
 FLAGS = (NOK,pNOK) &lt;-- Floating point number
 NV = 1
SV = IV(0x55efe5c37ff0) at 0x55efe5c38000
 REFCNT = 1
 FLAGS = (IOK,pIOK) &lt;-- Signed integer
 IV = 1000
</code></pre>
It's simply not something you should want to do.
The issue is that some interfaces impart meaning on how a number is stored. For example, a JSON serializer might serialize numbers stored as integers differently than numbers stored as floats. This could be considered a bug.
Bug or not, it doesn't change the fact that you need the requested conversion. It can be done using the Perl API.
<pre class="lang-perl prettyprint-override"><code>use Inline C =&gt; &lt;&lt;'__EOS__';

 SV* SvNV_force( SV* sv ) {
 SvREFCNT_inc( sv );
 sv_setnv( sv, SvNV( sv ) );
 return sv;
 }

__EOS__

use Devel::Peek qw( Dump );

my $x = 1000; Dump( $x );
SvNV_force( $x ); Dump( $x );
</code></pre>
<pre class="lang-none prettyprint-override"><code>SV = IV(0x55a354e92508) at 0x55a354e92518
 REFCNT = 1
 FLAGS = (IOK,pIOK) &lt;-- Signed integer
 IV = 1000
SV = PVNV(0x55a354e611a0) at 0x55a354e92518
 REFCNT = 1
 FLAGS = (NOK,pNOK) &lt;-- Floating point number
 IV = 1000
 NV = 1000
 PV = 0
</code></pre>

I searched for a built in function to convert an integer to float type, but there isn't any. I want to convert a number 1000 into 1000.0

How can I convert an integer to a float value in Perl?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我搜索内置函数将整数转换为浮动类型，但是没有。我想把一个数字1000转换成1000.0。

问如何在Perl中将整数转换为浮点值？
EN

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问如何在Perl中将整数转换为浮点值？EN