Added Set Function

Assignment 1/Program.cs

@@ -180,6 +180,40 @@ namespace Assignment_1
                 return true;
             }
 
+            bool Set(Stream source)
+            {
+                string identifier;
+                long resultPos = FindIdentifier(source, out identifier);
+                if (resultPos < 0)
+                {
+                    // Couldn't match an identifier
+                    // If ID Doesn't exist, we should make it
+                    return false;
+                }
+                source.Position = resultPos;
+                string expression;
+                resultPos = FindExpression(source, out expression);
+                if (resultPos < 0)
+                {
+                    // Couldn't match expression
+                    return false;
+                }
+                if (Symbols.ContainsKey(identifier))
+                {
+                    if (Symbols[identifier].Item2 == VariableFlags.Reserved)
+                    {
+                        Console.WriteLine("Error: Cannot assign to {0} as it is a reserved constant.");
+                        return false;
+                    }
+                    Symbols[identifier] = new Tuple<string, VariableFlags>(expression, Symbols[identifier].Item2);
+                }
+                else
+                {
+                    Symbols.Add(identifier, new Tuple<string, VariableFlags>(expression, VariableFlags.Empty));
+                }
+                return true;
+            }
+
             #endregion
             #region Data Handling
             // Data Handling