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, 15 insertions, 0 deletions

diff --git a/euclid.c b/euclid.c
new file mode 100644
index 0000000..72d7648
--- /dev/null
+++ b/euclid.c
@@ -0,0 +1,15 @@
+#include "euclid.h"
+
+size_t gcd(size_t a, size_t b) [[__unsequenced__]];
+
+int main(int argc, char* argv[argc+1]) {
+  size_t prev = 0;
+  for (int i = 1; i < argc; ++i) {        // Processes args
+    size_t act = strtoull(argv[i], nullptr, 0); // arg -> unsigned long long
+    if (prev)
+      printf("gcd(%zu, %zu) is %zu\n",
+             prev, act, gcd(prev, act));
+    prev = act;
+  }
+  return EXIT_SUCCESS;
+}