Replace switch with if-else in Calc.cs

Author: amidgol

dotnet_3/cs/rest/SCS/Imp/Calc.cs

@@ -8,22 +8,32 @@ public static string Subject(string op, double arg1 , double arg2 )
         {
             op = op.ToLower();
 
-            var result = op switch
-            {
-                "pi" => Math.PI,
-                "e" => Math.E,
-                "sqrt" => Math.Sqrt(arg1),
-                "log" => Math.Log(arg1),
-                "sine" => Math.Sin(arg1),
-                "cosine" => Math.Cos(arg1),
-                "tangent" => Math.Tan(arg1),
-                "plus" => arg1 + arg2,
-                "subtract" => arg1 - arg2,
-                "multiply" => arg1 * arg2,
-                "divide" => arg1 / arg2,
-                _ => 0.0
-            };
-            
+            double result;
+            if (op == "pi")
+                result = Math.PI;
+            else if (op == "e")
+                result = Math.E;
+            else if (op == "sqrt")
+                result = Math.Sqrt(arg1);
+            else if (op == "log")
+                result = Math.Log(arg1);
+            else if (op == "sine")
+                result = Math.Sin(arg1);
+            else if (op == "cosine")
+                result = Math.Cos(arg1);
+            else if (op == "tangent")
+                result = Math.Tan(arg1);
+            else if (op == "plus")
+                result = arg1 + arg2;
+            else if (op == "subtract")
+                result = arg1 - arg2;
+            else if (op == "multiply")
+                result = arg1 * arg2;
+            else if (op == "divide")
+                result = arg1 / arg2;
+            else
+                result = 0.0;
+
             return "" + result;
         }
     }