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unicode.md: print -> println
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docs/unicode.md

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@@ -765,14 +765,14 @@ UTF-8 无法取出单个非 ASCII 字符,对于单个中文字符,仍然只
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```cpp
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std::string s = "小彭老师公开课万岁";
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fmt::print("UTF-8 下第一个字节:{}", s[0]);
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fmt::println("UTF-8 下第一个字节:{}", s[0]);
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// 可能会打印 ‘å’ (0xE5),因为“小”的 UTF-8 编码是 0xE5 0xB0 0x8F
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// 也可能是乱码“�”,取决于终端理解的编码格式
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```
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```cpp
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std::u32string s = U"小彭老师公开课万岁";
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fmt::print("UTF-32 下第一个字符:{}", utf8::utf32to8(s.substr(0, 1)));
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fmt::println("UTF-32 下第一个字符:{}", utf8::utf32to8(s.substr(0, 1)));
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// 会打印 ‘小’
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```
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