C# 原碼與補碼的轉換

            /// <summary>
            /// 求一個16位數數的補碼
            /// </summary>
            /// <param name="OriginalCode">傳入一個Int16整型</param>
            /// <returns></returns>
            public static int ConvertComplementCode(int OriginalCode)
            {
                int a = short.MaxValue;
                int b = short.MinValue;
                int c = a - b;
                int d = 0;
                if (OriginalCode > 0)
                {
                    d = -(c - OriginalCode + 1);
                }
                else
                {
                    d = c + OriginalCode + 1;
                }
                return d;
            }

            /// <summary>
            /// 求一個32位數的補碼
            /// </summary>
            /// <param name="OriginalCode">傳入一個Int32整型</param>
            /// <returns></returns>
            public static long ConvertComplementCode(long OriginalCode)
            {
                long a = int.MaxValue;
                long b = int.MinValue;
                long c = a - b;
                long d = 0;
                if (OriginalCode > 0)
                {
                    d = -(c - OriginalCode + 1);
                }
                else
                {
                    d = c + OriginalCode + 1;
                }
                return d;
            }