C#.NET enums — analyze the following declaration: enum color : byte { red = 500, green = 1000, blue = 1500 } Which statement about this code is correct?
-
Abyte values cannot be assigned to enum elements.
-
Benum elements should always take successive values.
-
CSince 500, 1000, 1500 exceed the valid range of byte, the compiler will report an error.
-
Denum must always be of int type.
-
Eenum elements should be declared as private.
Answer
Correct Answer: Since 500, 1000, 1500 exceed the valid range of byte, the compiler will report an error.
Explanation
Introduction / Context:In C#, an enum’s underlying type controls the representable range of its named constants. This question checks if you remember that constraint.
Given Data / Assumptions:
- The enum underlying type is
byte(range 0..255). - Assigned values are 500, 1000, 1500.
Concept / Approach:Enum members must be compile-time constants convertible to the underlying type without overflow. Assigning a value outside the underlying type’s range is a compile-time error.
Step-by-Step Solution:
Check range: 500, 1000, 1500 > 255 → not representable asbyte.Compiler emits an error for each out-of-range assignment.Verification / Alternative check:Change the underlying type to int or reduce constants to within 0..255 to make it compile.
Why Other Options Are Wrong:(a) is false — you can assign compatible constants; (b) successive values are not required; (d) underlying type can be any integral type except char by default (int if unspecified); (e) access modifiers on enum members are not used — they are constants.
Common Pitfalls:Assuming the compiler silently wraps values; it does not for enum member declarations.
Final Answer:Since 500, 1000, 1500 exceed the valid range of byte, the compiler will report an error.