A character in a C string
The C string "\u00E4" specifies “Latin small letter a with diaeresis.” Its Unicode code point is 228, or 0xE4. The escape names the character; the multibyte string’s byte sequence is a separate matter. section 14.3
A code point identifies a character concept, not its printed shape, or glyph. “Latin capital letter A” can have several glyphs, while “Greek capital letter Alpha” can look similar. Unicode also classifies characters and records relationships such as capitalization. section 14.3
43 #define VBAR "\u2502" /**< a vertical bar character */
44 #define HBAR "\u2500" /**< a horizontal bar character */
45 #define TOPLEFT "\u250c" /**< topleft corner character */
46 #define TOPRIGHT "\u2510" /**< topright corner character */
!@%STYLE%@!
{"css":"{\"css\": \"font-weight: bold;\"}","target":"[[{\"line\":0,\"ch\":0},{\"line\":0,\"ch\":2}],[{\"line\":0,\"ch\":5},{\"line\":0,\"ch\":12}],[{\"line\":1,\"ch\":5},{\"line\":1,\"ch\":12}],[{\"line\":2,\"ch\":5},{\"line\":2,\"ch\":12}],[{\"line\":3,\"ch\":5},{\"line\":3,\"ch\":12}],[{\"line\":1,\"ch\":0},{\"line\":1,\"ch\":2}],[{\"line\":0,\"ch\":5},{\"line\":0,\"ch\":12}],[{\"line\":1,\"ch\":5},{\"line\":1,\"ch\":12}],[{\"line\":2,\"ch\":5},{\"line\":2,\"ch\":12}],[{\"line\":3,\"ch\":5},{\"line\":3,\"ch\":12}],[{\"line\":2,\"ch\":0},{\"line\":2,\"ch\":2}],[{\"line\":0,\"ch\":5},{\"line\":0,\"ch\":12}],[{\"line\":1,\"ch\":5},{\"line\":1,\"ch\":12}],[{\"line\":2,\"ch\":5},{\"line\":2,\"ch\":12}],[{\"line\":3,\"ch\":5},{\"line\":3,\"ch\":12}],[{\"line\":3,\"ch\":0},{\"line\":3,\"ch\":2}],[{\"line\":0,\"ch\":5},{\"line\":0,\"ch\":12}],[{\"line\":1,\"ch\":5},{\"line\":1,\"ch\":12}],[{\"line\":2,\"ch\":5},{\"line\":2,\"ch\":12}],[{\"line\":3,\"ch\":5},{\"line\":3,\"ch\":12}]]"}
!@%STYLE%@!
These C macros use four-digit \u escapes to specify box-drawing characters, including horizontal and vertical bars. section 14.3
TAKEAWAY: In C11, \u followed by four hexadecimal digits specifies a Unicode code point; \U followed by eight digits provides a wider range. A configured system may also let you type the character directly into a multibyte string. section 14.3
