now version controlled.

1 files changed, 27 insertions, 0 deletions

diff --git a/isptrmod.c b/isptrmod.c
new file mode 100644
index 0000000..912a66d
--- /dev/null
+++ b/isptrmod.c
@@ -0,0 +1,27 @@
+#include <u.h>
+#include <libc.h>
+
+/*
+ * this program proofs that effectively, pointer arguments are passed by
+ * value and its modification doesn't extend beyond the scope of the
+ * currently running procedure.
+ */
+
+void
+incptr(char *p)
+{
+	p += 3;
+	print("%s\n", p);
+}
+
+void
+main()
+{
+	char *s;
+
+	s = "hi there!";
+	print("%s\n", s);
+	incptr(s);
+	print("%s\n", s);
+	exits(0);
+}