From 8fcf8c747d98820a63f0a493ed1c94591388ee65 Mon Sep 17 00:00:00 2001
From: Artur Drobot <405502@bsd48.org>
Date: Mon, 24 Jul 2017 10:53:23 -0700
Subject: [PATCH] Create Number interface.

---
 src/org/nwapw/abacus/number/Number.java | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 src/org/nwapw/abacus/number/Number.java

diff --git a/src/org/nwapw/abacus/number/Number.java b/src/org/nwapw/abacus/number/Number.java
new file mode 100644
index 0000000..726bd23
--- /dev/null
+++ b/src/org/nwapw/abacus/number/Number.java
@@ -0,0 +1,11 @@
+package org.nwapw.abacus.number;
+
+public interface Number {
+
+    Number multiply(Number multiplier);
+    Number divide(Number divisor);
+    Number add(Number summand);
+    Number subtract(Number subtrahend);
+    Number negate();
+
+}