Added CalculateBinFloat() & CalculateHexFloat()

uses X-XXX-XXXX, sign-mantissa-exponent format on binary values to calculate decimal floating point numbers

src/Extensions.cs

@@ -50,5 +50,63 @@ namespace processor
             }
             return r;
         }
+
+        internal static double CalculateBinFloat(string bin)
+        {
+            if (bin.Length is not 8)
+                throw new ArgumentOutOfRangeException(nameof(bin), "Binary representation of float value is not an 8-bit string.");
+            
+            int sign = bin[0] is '1' ? -1 : 1;
+            string exponent = new(new[] { bin[1], bin[2], bin[3] });
+            int exp = exponent switch
+            {
+                "000" => -4,
+                "001" => -3,
+                "010" => -2,
+                "011" => -1,
+                "100" => 0,
+                "101" => 1,
+                "110" => 2,
+                "111" => 3,
+                _ => 0
+            };
+
+            double sum;
+            string mantissa = new(new[] { '.', bin[4], bin[5], bin[6], bin[7] });
+            switch (exp)
+            {
+                case > 0:
+                    mantissa = mantissa.Remove(0, 1).Insert(exp, ".");
+                    break;
+                case < 0:
+                    mantissa = mantissa.Remove(0, 1).Insert(0, Add("0", -1 * exp)).Insert(0, "0.");
+                    break;
+                default:
+                    mantissa = mantissa.Insert(0, "0");
+                    break;
+            }
+            
+
+            string[] parts = mantissa.Split('.');
+            sum = Convert.ToInt32(parts[0], 2);
+            for (int i = 0; i < parts[1].Length; i++)
+                sum += int.Parse(parts[1][i].ToString()) / Math.Pow(2, i + 1);
+
+            return sign * sum;
+        }
+
+        internal static double CalculateHexFloat(string hex)
+        {
+            if (hex.Length is not 2)
+                throw new ArgumentOutOfRangeException(nameof(hex), "Hexadecimal representation of float value is not an 2 character string.");
+            return CalculateBinFloat(Convert.ToString(Convert.ToInt32(hex, 16), 2).PadLeft(8, '0'));
+        }
+
+        private static string Add(string str, int count = 0)
+        {
+            for (int i = 1; i < count; i++)
+                str = str.Insert(0, str[0].ToString());
+            return str;
+        }
     }
 }