关于区域设置的问题 [英] question about locale

问题描述

请说明在c ++中使用locale的目的？我已阅读文档，但不要uderstand请帮助

please explain purpose of usage of locale in c++? i have read documents but dont uderstand please help

推荐答案

基本目的是本地化应用程序。例如，在美国，带有小数分隔符的大数字通常写成：1,234.56。在欧洲大部分地区，相同的数字通常写成：1.234,56。

The basic purpose is for localizing applications. For example, in the US a large number with a decimal separator would normally be written like: "1,234.56". Throughout much of Europe the same number would normally be written like: "1.234,56".

区域设置允许您隔离有关此类格式的信息国家之间，语言，文化等）到一个地方。例如，我可以使用：

A locale allows you to isolate information about such formatting (and other things that vary between countries, languages, cultures, etc.) into one place. For example, I might use:

std::locale loc("");
std::cout.imbue(loc);

std::cout << 1234.56;

未命名的语言环境（）是特殊的：它会自动选择用户配置的语言环境。当我运行这个代码，我得到的输出是：1,234.56。其他人可以运行完全相同的代码，但是如果他们的环境配置了一些其他约定，他们可能会得到1.234,56或1 234,56等。

The unnamed locale ("") is special: it automatically picks out whatever locale the user has configured. When I run this code, the output I get is: "1,234.56". Somebody else could run exactly the same code, but if their environment was configured for some other convention, they might get "1.234,56" or "1 234,56", etc.

所以，区域设置购买我们的大部分（在这种情况下）是保持写一个数字单独格式化该数字适合特定的观众。当然，区域设置具有多个facet，每个都包括单独的... well，本地化的方面，例如格式化数字，格式化货币，确定什么被认为是小写或大写字母等。

So, most of what the locale buys us (in this case) is keeping writing a number separate from formatting that number appropriately for a specific audience. Of course, a locale has a number of "facets", each of which covers a separate...well, facet of localization, such as formatting numbers, formatting currency, determining what's considered a lower-case or upper-case letter, etc.

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