In this chapter, we will design a new C# langauge feature that we call Switch operator (?::). This feature is derived from two existing C# language constructs: switch statement (https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/switch) and conditional operator (?:) (https://docs.microsoft.com/en-us/cpp/cpp/conditional-operator-q). It allows writing conditional expressions that can switch on multiple values of the expression and return a corresponding value or a default value. For example, consider the following switch statement that computes a string representation for an integral expression:
public string GetString(int expression){ string expressionStr; switch (expression) ...
