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Unary operator overloading in C#.NET — which unary operators among the list are overloadable?

Difficulty: Easy

Correct Answer: true, false, and unary + can be overloaded.

Explanation:


Introduction / Context:
C# permits overloading many unary operators to customize semantics for user-defined types.



Given Data / Assumptions:

  • Operators under consideration: true, false, +, new, is.


Concept / Approach:
Overloadable unary operators include +, -, !, ~, ++, --, true, and false. Keywords new and is are not overloadable operators.



Step-by-Step Solution:

1) true/false: overloadable to support custom truthiness on types.2) unary +: overloadable; often paired with binary + overloads.3) new: not an operator you can overload.4) is: not overloadable.


Verification / Alternative check:
Compile a struct with public static bool operator true(...) and public static bool operator false(...).



Why Other Options Are Wrong:
B and D include non-overloadable keywords; C is incomplete.



Common Pitfalls:
Confusing language keywords with overloadable operators.



Final Answer:
true, false, and unary + can be overloaded.

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