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, 19 insertions, 0 deletions

diff --git a/fibonacci.c b/fibonacci.c
new file mode 100644
index 0000000..640304e
--- /dev/null
+++ b/fibonacci.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include "c23-fallback.h"
+
+size_t fib(size_t n) [[__unsequenced__]] {
+  if (n < 3)
+    return 1;
+  else
+    return fib(n-1) + fib(n-2);
+}
+
+
+int main(int argc, char *argv[]) {
+  for (int i = 1; i < argc; ++i) {             // Processes args
+    size_t const n = strtoull(argv[i], nullptr, 0);  // arg -> size_t
+    printf("fib(%zu) is %zu\n",
+           n, fib(n));
+  }
+  return EXIT_SUCCESS;
+}