initial commit

c/hello-world/src/hello_world.c

@@ -0,0 +1,7 @@
+#include <stddef.h>
+#include "hello_world.h"
+
+const char *hello(void)
+{
+   return "Hello, World!";
+}

c/hello-world/src/hello_world.h

@@ -0,0 +1,14 @@
+// This is called an include guard, which ensures that the header is only
+// included once. You could alternatively use '#pragma once'. See
+// https://en.wikipedia.org/wiki/Include_guard.
+#ifndef HELLO_WORLD_H
+#define HELLO_WORLD_H
+
+// Declare the 'hello()' function, which takes no arguments and returns a
+// 'const char *', i.e. a pointer to a character (in this case the first
+// character in a string). The function itself is defined in the hello_world.c
+// source file. Ths function is called by the test case(s) in the test source
+// file test/test_hello_world.c.
+const char *hello(void);
+
+#endif