Import official C23 code examples for Modern C (Jens Gustedt, 2024)HEADupstream-importmain

- Add official C source files, Makefile, c23-fallback.h, and LICENSE
- Update README.md with study mirror notice

1 files changed, 32 insertions, 0 deletions

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+/**
+ ** @file Test handling of different Unicode letters in identifiers.
+ **/
+
+#include "c23-fallback.h"
+
+double Å = 1;                  // error, Ångström not normalized
+double Å = 2;                  // ok, A with circle
+double A\u030A = 3;            // error, combination not normalized
+double Ω = 1;                  // error, Ohm not normalized
+double Ω = 2;                  // ok, Greek capital omega
+double K = 1;                  // error, Kelvin not normalized
+double K = 2;
+double fi  = 1;                 // valid, fi does not decompose into f and i
+double fi = 2;                 // valid, different identifier
+typedef double ℝ;              // valid
+typedef unsigned long long ℕ;  // valid
+#define ℜ(Z) real(Z)          // valid
+#define ℑ(Z) imag(Z)           // valid
+ℕ №;                           // error: Numero sign is not a letter
+ℕ ℓ;                           // valid, ell sign is a letter
+double ʃ(double a, double b, double φ(double)); // IPA is also acceptable
+typedef double 각;             // valid, Hangul generally maps to itself
+각 α = 1;
+enum : bool { 응 = true, wɛ = true, };
+char const 얜읐[] = "얜읐";
+int a١ = 1;                    // valid, Arabic digits are considered different
+int a1 = 2;
+int a⁰ = 1;                    // non-portable, gcc and clang extension
+int a𝟬 = 1;                    // valid, but not a good idea
+int a0 = 2;
+unsigned Ⅾ;                    // valid, roman digit 500, really a bad idea