From fef36fd11c9d3d7f632098c5005bf0e3e5ce5ad9 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Wed, 17 Jan 2018 12:01:40 +0100
Subject: finished Screen.

- a bit slow though
---
 projects/12/MathTest/Math.jack | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'projects/12/MathTest/Math.jack')

diff --git a/projects/12/MathTest/Math.jack b/projects/12/MathTest/Math.jack
index 6bac42e..01bce8f 100644
--- a/projects/12/MathTest/Math.jack
+++ b/projects/12/MathTest/Math.jack
@@ -28,6 +28,18 @@ class Math {
         return ~(x & twoToThe[i] = 0);
     }
 
+    function int sign(int x) {
+        if (x > 0) {
+            return 1;
+        } else {
+            if (x < 0) {
+                return -1;
+            } else {
+                return 0;
+            }
+        }
+    }
+
     /** Returns the absolute value of x. */
     function int abs(int x) {
         if (x > 0){
-- 
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