1 files changed, 23 insertions, 0 deletions
diff --git a/examples/sum.fwd b/examples/sum.fwd
new file mode 100644
index 0000000..89a2d11
--- /dev/null
+++ b/examples/sum.fwd
@@ -0,0 +1,23 @@
+print_int(i64 a);
+print_nl();
+
+sum_inner(i64 s, i64 n, (i64) res)
+{
+	if n <= 0 {
+		res(s);
+	} else {
+		sum_inner(s + n, n - 1, res);
+	}
+}
+
+sum(i64 n, (i64) res)
+{
+	sum_inner(0, n, res);
+}
+
+main()
+{
+	sum(1000000000) => i64 s;
+	print_int(s);
+	print_nl();
+}