C ++ Unicode字符打印 [英] C++ unicode characters printing

问题描述

我需要使用 iostream 在Linux终端上打印一些Unicode字符。奇怪的事情发生了。当我写时：

I need to print some unicode characters on the Linux terminal using iostream. Strange things happen though. When I write:

cout << "\u2780";

我得到：➀，几乎正是我想要的但是，如果我这样写：

I get: ➀, which is almost exactly what I want. However if I write:

cout << '\u2780';

我得到： 14851712 。

问题是，我不知道在编译时要打印的确切字符。因此，我想执行以下操作：

The problem is, I don't know the exact character to be printed at compile-time. Therefore I'd like to do something like:

int x;
// some calculations...
cout << (char)('\u2780' + x);

哪些印刷品：。。使用 wcout 或 wchar_t 也不起作用。如何获得正确的打印？

Which prints: �. Using wcout or wchar_t instead don't work either. How do I get correct printing?

从网上发现的情况来看，直接使用Debian Wheezy仓库中的g ++ 4.7.2编译器似乎很重要。

From what I found around on the Internet it seems important that I use g++ 4.7.2 compiler straight from Debian Wheezy repository.

推荐答案

Unicode字符 \u2780 不在<$的范围内c $ c> char 数据类型。您应该已经收到此编译器警告，告诉您有关它的信息：（至少我的g ++ 4.7.3给出了此提示）

The Unicode character \u2780 is outside of the range for the char datatype. You should have received this compiler warning to tell you about it: (at least my g++ 4.7.3 gives it)

test.cpp:6:13: warning: multi-character character constant [-Wmultichar]

如果要像U + 2780这样的字符作为单个单位使用，您将必须使用widechar数据类型 wchar_t ，或者如果您很幸运能够使用C ++ 11 ， char32_t 或 char16_t 。请注意，一个16位单元不足以表示Unicode字符的全部范围。

If you want to work with characters like U+2780 as single units you'll have to use the widechar datatype wchar_t, or if you are lucky enough to be able to work with C++11, char32_t or char16_t. Note that one 16-bit unit is not enough to represent the full range of Unicode characters.

如果这对您不起作用，可能是因为默认的 C语言环境不支持非ASCII输出。要解决该问题，您可以在程序开始时调用 setlocale 。这样，您可以输出用户语言环境支持的所有字符：（可能支持或不支持您使用的所有字符）

If that's not working for you, it's probably because the default "C" locale doesn't have support for non-ASCII output. To fix that problem you can call setlocale in the start of the program; that way you can output the full range of characters supported by the user's locale: (which may or may not have support for all of the characters you use)

#include <clocale>
#include <iostream>

using namespace std;

int main() {
    setlocale(LC_ALL, "");
    wcout << L'\u2780';
    return 0;
}

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