blocks|key|2669276|text|目前没有办法做到这一点。然而，有一项建议是引入digit+seperators+(N3499)。他们还没有选择他们想要用作分隔符的字符。目前的建议是：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2669277|重音空间：4+815+162+342|style|CODE|2669278|Grave+|unordered-list-item|2669279|
|2669280|：4'815'162'342|2669281|2669282|Underscore：4_815_162_342|2669283|
+|2669284|2669285|2669286|不幸的是，它们都存在提案中描述的问题。|2669287|您可以通过使用用户定义的文字来采用hacky方法：|2669288|long+long+operator+""+_s(const+char*+cstr,+size_t)+
{
++++std::string+str(cstr);
++++str.erase(std::remove(str.begin(),+str.end(),+','),+str.end());
++++return+std::stoll(str);
}

int+main()
{
++++std::cout+<<+"4,815,162,342"_s+<<+std::endl;
}|code-block|syntax|javascript|2669289|这将打印出来：|2669290|4815162342|2669291|它只是从给定的文字中删除所有逗号，并将其转换为整数。|2669292|entityMap|0|LINK|mutability|MUTABLE|url|http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3499.html^0|N|O|0|0|5|D|0|0|0|1|D|0|0|B|D|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@]|9|@$A|1J|B|1K|1|1L]]|C|$]]|$1|D|3|E|5|6|7|1M|8|@$A|1N|B|1O|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|1P|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|M|3|N|5|J|7|1R|8|@$A|1S|B|1T|F|G]]|9|@]|C|$]]|$1|O|3|L|5|6|7|1U|8|@]|9|@]|C|$]]|$1|P|3|Q|5|J|7|1V|8|@$A|1W|B|1X|F|G]]|9|@]|C|$]]|$1|R|3|S|5|6|7|1Y|8|@]|9|@]|C|$]]|$1|T|3|-4|5|J|7|1Z|8|@]|9|@]|C|$]]|$1|U|3|-4|5|6|7|20|8|@]|9|@]|C|$]]|$1|V|3|W|5|6|7|21|8|@]|9|@]|C|$]]|$1|X|3|Y|5|6|7|22|8|@]|9|@]|C|$]]|$1|Z|3|10|5|11|7|23|8|@]|9|@]|C|$12|13]]|$1|14|3|15|5|6|7|24|8|@]|9|@]|C|$]]|$1|16|3|17|5|11|7|25|8|@]|9|@]|C|$12|13]]|$1|18|3|19|5|6|7|26|8|@]|9|@]|C|$]]|$1|1A|3|-4|5|6|7|27|8|@]|9|@]|C|$]]]|1B|$1C|$5|1D|1E|1F|C|$1G|1H]]]]

There is no way to do this currently. There is, however, a proposal to introduce <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3499.html">digit seperators (N3499)</a>. They haven't yet chosen which character they'd like to use as a separator though. The current suggestions are:

<ul>
<li>Space: <code>4 815 162 342</code></li>
<li>Grave accent: <code>4`815`162`342</code></li>
<li>Single quote: <code>4'815'162'342</code></li>
<li>Underscore: <code>4_815_162_342</code></li>
</ul>

Unfortunately, they all have problems as described in the proposal.

You can take the hacky approach by using a user-defined literal:

<pre><code>long long operator "" _s(const char* cstr, size_t) 
{
 std::string str(cstr);
 str.erase(std::remove(str.begin(), str.end(), ','), str.end());
 return std::stoll(str);
}

int main()
{
 std::cout &lt;&lt; "4,815,162,342"_s &lt;&lt; std::endl;
}
</code></pre>

This will print out:

<pre><code>4815162342
</code></pre>

It simply removes all of the commas from the given literal and converts it to an integer.

blocks|key|1099459|text|通过使用适当的语言环境facet+(在本例中为num_put)+imbue()+I/O流，您所寻找的内容是完全可能的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1099460|(假设您谈论的是I/O。如果您谈论的是源本身，那么从C%2B%2B11开始，这是不可能的。)|1099461|entityMap|0|LINK|mutability|MUTABLE|url|http://en.cppreference.com/w/cpp/locale/num_put^0|W|7|N|7|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

What you are looking for is perfectly possible by <code>imbue()</code>ing the I/O stream with the appropriate locale facet (in this case, <a href="http://en.cppreference.com/w/cpp/locale/num_put" rel="nofollow">num_put</a>).

(This is assuming you are talking about I/O. If you are talking about the source itself, that is not possible as of C++11.)

blocks|key|545397|text|从C%2B%2B14开始，您可以将'用作digit+group+separator|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|545398|auto+one_m+=+1'000'000;|code-block|syntax|javascript|545399|以前的C%2B%2B版本本身并不支持这一点。有两种主要的解决方法：|545400|545401|Using+user-defined+literals+in+C%2B%2B11；这将允许您编写如下代码：|unordered-list-item|545402|545403|auto+x=+"1_000_000"_i；|545404|(将这段代码写成constexpr会更麻烦，- but是完全可能的。)|545405|允许以下代码的|545406|Using+a+straightforward+macro，：|545407|545408|自动x=+NUM(1,000,000);|545409|entityMap|0|LINK|mutability|MUTABLE|url|https://en.cppreference.com/w/cpp/language/integer_literal#Single_quote|1|https://stackoverflow.com/a/14220849/1968|2|https://stackoverflow.com/a/14220401/1968^0|D|1|G|L|0|0|0|0|0|0|10|1|0|0|0|8|9|0|0|0|T|2|0|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|F|3|G|5|H|7|1K|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1L|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1N|8|@]|D|@$9|1O|A|1P|1|1Q]]|E|$]]|$1|Q|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1S|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|1T|8|@$9|1U|A|1V|B|C]]|D|@]|E|$]]|$1|V|3|W|5|6|7|1W|8|@]|D|@]|E|$]]|$1|X|3|Y|5|P|7|1X|8|@]|D|@$9|1Y|A|1Z|1|20]]|E|$]]|$1|Z|3|-4|5|6|7|21|8|@]|D|@]|E|$]]|$1|10|3|11|5|6|7|22|8|@]|D|@]|E|$]]|$1|12|3|-4|5|6|7|23|8|@]|D|@]|E|$]]]|13|$14|$5|15|16|17|E|$18|19]]|1A|$5|15|16|17|E|$18|1B]]|1C|$5|15|16|17|E|$18|1D]]]]

As of C++14, you can use <code>'</code> as a <a href="https://en.cppreference.com/w/cpp/language/integer_literal#Single_quote" rel="nofollow noreferrer">digit group separator</a>:
<pre><code>auto one_m = 1'000'000;
</code></pre>
Previous versions of C++ did not support this natively. There were two major workarounds:
<ul>
<li><a href="https://stackoverflow.com/a/14220849/1968">Using user-defined literals in C++11</a>; this would allow you to write code as follows:
<pre><code>auto x = &quot;1_000_000&quot;_i;
</code></pre>
(Writing this as a <code>constexpr</code> would be trickier – but is definitely possible.)
</li>
<li><a href="https://stackoverflow.com/a/14220401/1968">Using a straightforward macro</a>, which would allow the following code:
<pre><code> auto x = NUM(1,000,000);
</code></pre>
</li>
</ul>

blocks|key|6022225|text|您可以只定义一个可变的宏，就像N(123,456,678)一样使用。不过，它的麻烦比它的价值多一点。特别是，对于用于计算参数的可移植代码，您可能必须解决一些视觉上的c%2B%2B特性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|6022226|entityMap^0|F|E|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

you can always just define a variadic macro, used like <code>N(123,456,678)</code>. it's a bit more trouble than it's worth, though. in particular, you may have to workaround some visual c++ peculiarities for portable code for counting arguments.

blocks|key|2669417|text|int+main()
{
+++int+x+=+1e6;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2669418|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

In Ada it is possible to write numbers with underscores for separating digits, which greatly improves readability. For example: 1_000_000 (which is equivalent to 1000000)
Is there some similar way for C++?

EDIT: This is question about source code, not I/O.

Nicely formatting numbers in C++

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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在Ada中，可以用下划线分隔数字，这极大地提高了可读性。例如: 1_000_000 (相当于1000000)对C++有类似的方式吗？编辑:这是关于源代码的问题，而不是I/O。

问在C++中很好地格式化数字
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