diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8b9e5a4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+*.out
+*.o
+*.a
+*.swp
+
+#Because I'm not using gcc or csh.
+book_code/unix-xwindows/gccx
diff --git a/ch1/simple_io.c b/ch1/simple_io.c
new file mode 100644
index 0000000..5227f5e
--- /dev/null
+++ b/ch1/simple_io.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include "../book_code/unix-xwindows/genlib.h"
+#include "../book_code/unix-xwindows/simpio.h"
+
+int main() {
+	double n1, n2, n3, average;
+
+	printf("This program averages three numbers.\n");
+	printf("1st number: ");
+	n1 = GetReal();
+	printf("2nd number: ");
+	n2 = GetReal();
+	printf("3rd number: ");
+	n3 = GetReal();
+	average = (n1 + n2 + n3) / 3;
+	printf("The average is %g\n", average);
+
+	return 0;
+}
diff --git a/roberts_clang b/roberts_clang
new file mode 100755
index 0000000..5dbed2a
--- /dev/null
+++ b/roberts_clang
@@ -0,0 +1,5 @@
+#! /usr/bin/env sh
+INCLUDE=/home/matt/dev/c/roberts_abstractions/book_code/unix-xwindows
+CSLIB=$INCLUDE/cslib.a
+LIBRARIES="$CSLIB -lX11 -lm"
+clang -I$INCLUDE $* $LIBRARIES