Initial commit

Chapter1/Section2/hello.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#if 0
+void main(void);
+void main(int argc, char **argv);// char *argv[]
+int main(int argc, char **argv);
+int main(void);
+#endif
+
+int main(void)
+{
+    printf("Hello world!\n");
+
+    exit(0);
+}