diff --git a/code/awk/demo-func.awk b/code/awk/demo-func.awk
new file mode 100755
index 0000000..dbcb1bf
--- /dev/null
+++ b/code/awk/demo-func.awk
@@ -0,0 +1,20 @@
+#!/usr/bin/awk -f
+BEGIN	{
+	print "---- demo fonction ----"
+	print_sinus(1.0)
+	print_dist(0.5, 0.5, 0.0)
+	}
+
+# the simple version
+function print_sinus ( value )
+{
+printf "sin(%f) = %f\n", value, sin(value)
+}
+
+# version with local variables.
+function print_dist(x, y, z,    dist)
+{
+dist = sqrt(x*x + y*y + z*z)
+printf "distance from center = %f\n", dist
+}
+