From a000308104aab27c2dde9a306f1bc654b2db4806 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Wed, 29 Nov 2017 12:30:41 +0100
Subject: first commit

---
 projects/12/Math.jack | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 projects/12/Math.jack

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

diff --git a/projects/12/Math.jack b/projects/12/Math.jack
new file mode 100644
index 0000000..a57f023
--- /dev/null
+++ b/projects/12/Math.jack
@@ -0,0 +1,47 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/12/Math.jack
+
+/**
+ * A library of commonly used mathematical functions.
+ * Note: Jack compilers implement multiplication and division using OS method calls.
+ */
+class Math {
+
+    /** Initializes the library. */
+    function void init() {
+    }
+
+    /** Returns the absolute value of x. */
+    function int abs(int x) {
+    }
+
+    /** Returns the product of x and y. 
+     *  When a Jack compiler detects the multiplication operator '*' in the 
+     *  program's code, it handles it by invoking this method. In other words,
+     *  the Jack expressions x*y and multiply(x,y) return the same value.
+     */
+    function int multiply(int x, int y) {
+    }
+
+    /** Returns the integer part of x/y.
+     *  When a Jack compiler detects the multiplication operator '/' in the 
+     *  program's code, it handles it by invoking this method. In other words,
+     *  the Jack expressions x/y and divide(x,y) return the same value.
+     */
+    function int divide(int x, int y) {
+    }
+
+    /** Returns the integer part of the square root of x. */
+    function int sqrt(int x) {
+    }
+
+    /** Returns the greater number. */
+    function int max(int a, int b) {
+    }
+
+    /** Returns the smaller number. */
+    function int min(int a, int b) {
+    }
+}
-- 
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