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/endianness.c b/endianness.c
new file mode 100644
index 0000000..ec589d7
--- /dev/null
+++ b/endianness.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <inttypes.h>
+
+typedef union unsignedInspect unsignedInspect;
+union unsignedInspect {
+  unsigned val;
+  unsigned char bytes[sizeof(unsigned)];
+};
+unsignedInspect twofold = { .val = 0xAABBCCDD, };
+
+int main(void) {
+  printf("value is 0x%.08X\n", twofold.val);
+  for (size_t i = 0; i < sizeof twofold.bytes; ++i)
+    printf("byte[%zu]: 0x%.02hhX\n", i, twofold.bytes[i]);
+  unsigned val = 0xAABBCCDD;
+  unsigned char* valp = (unsigned char*)&val;
+  for (size_t i = 0; i < sizeof val; ++i)
+    printf("byte[%zu]: 0x%.02hhX\n", i, valp[i]);
+}