From 47264b5a455ac9b6dc1b6f902857ad5ac8c41ff5 Mon Sep 17 00:00:00 2001
From: Don Zhu <85122787+DZ-FSDev@users.noreply.github.com>
Date: Thu, 10 Feb 2022 08:51:30 -0600
Subject: [PATCH 1/3] Create SIUnit.cs

---
 src/main/cs/SIUnit.cs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 src/main/cs/SIUnit.cs

diff --git a/src/main/cs/SIUnit.cs b/src/main/cs/SIUnit.cs
new file mode 100644
index 0000000..7910309
--- /dev/null
+++ b/src/main/cs/SIUnit.cs
@@ -0,0 +1,28 @@
+/*  Original Licensing Copyright
+ * 
+ *  Contains all International System of Units constants and definitions.
+ *  Copyright (C) 2021  DZ-FSDev
+ *  
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+namespace COM.DZ_FSDev.Physics
+{
+    /// <summary>
+    /// Contains all International System of Units constants and definitions.
+    /// </summary>
+    public abstract class SIUnit : IUnit
+    {
+
+    }
+}

From 3559e80e0c89dc826a9dc72577370eb07ab7523c Mon Sep 17 00:00:00 2001
From: Don Zhu <85122787+DZ-FSDev@users.noreply.github.com>
Date: Fri, 25 Feb 2022 15:44:17 -0600
Subject: [PATCH 2/3] Skel. Impl. IUnit

---
 src/main/cs/SIUnit.cs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/main/cs/SIUnit.cs b/src/main/cs/SIUnit.cs
index 7910309..17d0432 100644
--- a/src/main/cs/SIUnit.cs
+++ b/src/main/cs/SIUnit.cs
@@ -23,6 +23,28 @@ namespace COM.DZ_FSDev.Physics
     /// </summary>
     public abstract class SIUnit : IUnit
     {
+        public string Name { get => throw new System.NotImplementedException(); set => throw new System.NotImplementedException(); }
+        public string Symbol { get => throw new System.NotImplementedException(); set => throw new System.NotImplementedException(); }
+        public int Order { get => throw new System.NotImplementedException(); set => throw new System.NotImplementedException(); }
 
+        public bool CanAdd(IUnit unit)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public IUnit DivideBy(IUnit unit)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public IUnit MultiplyBy(IUnit unit)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        public IUnit Pow(decimal exponent)
+        {
+            throw new System.NotImplementedException();
+        }
     }
 }

From 6133c61d216ccd984b33e069258a53efc02c06de Mon Sep 17 00:00:00 2001
From: Don Zhu <85122787+DZ-FSDev@users.noreply.github.com>
Date: Thu, 3 Mar 2022 09:00:01 -0600
Subject: [PATCH 3/3] Update SIUnit.cs

---
 src/main/cs/SIUnit.cs | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/src/main/cs/SIUnit.cs b/src/main/cs/SIUnit.cs
index 17d0432..b1d4343 100644
--- a/src/main/cs/SIUnit.cs
+++ b/src/main/cs/SIUnit.cs
@@ -16,6 +16,8 @@
  *  You should have received a copy of the GNU General Public License
  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
+using System;
+
 namespace COM.DZ_FSDev.Physics
 {
     /// <summary>
@@ -23,9 +25,29 @@ namespace COM.DZ_FSDev.Physics
     /// </summary>
     public abstract class SIUnit : IUnit
     {
-        public string Name { get => throw new System.NotImplementedException(); set => throw new System.NotImplementedException(); }
-        public string Symbol { get => throw new System.NotImplementedException(); set => throw new System.NotImplementedException(); }
-        public int Order { get => throw new System.NotImplementedException(); set => throw new System.NotImplementedException(); }
+        private int _order;
+
+        /// <summary>
+        /// Gets the name of this SIUnit.
+        /// </summary>
+        public string Name { get; }
+
+        /// <summary>
+        /// Gets the symbol of this SIUnit
+        /// </summary>
+        public string Symbol { get; }
+
+        /// <summary>
+        /// Gets the Order of this SIUnit.
+        /// </summary>
+        public int Order { 
+            get { return _order; } 
+            private set 
+            {
+                if (value < 0) throw new ArgumentException("Order cannot be zero.","value");
+                _order = value;
+            }
+        }
 
         public bool CanAdd(IUnit unit)
         {