C#.NET — Identify the correct statements among the following operators: The conditional operator (?:) returns one of two values depending on a Boolean expression. The as operator is used to perform conversions between compatible reference types. The * operator is also used to declare pointer types and dereference pointers. The -> operator combines pointer dereferencing and member access. Brackets [ ] specify array indexing, while parentheses () are used for grouping and type casts.
C# Programming
Operators
Difficulty: Medium
Choose an option
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A1, 2, 4
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B2, 3, 5
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C3, 4, 5
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D1, 3, 5
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ENone of these
Answer
Correct Answer: 1, 2, 4
Explanation
Introduction / Context:This question assesses understanding of different operators in C#.NET, including conditional, casting, pointer, and array operators.
Given Data / Assumptions:
- Operator ?: is conditional.
- Operator as performs safe casting between compatible reference or nullable types.
- Operator * in unsafe contexts declares pointers or dereferences them.
- Operator -> is valid in unsafe code for member access via a pointer.
- Brackets [] are for array indexing. Parentheses () are for grouping/casts, not [].
Concept / Approach:Cross-check each statement with the C# specification for operators.
Step-by-Step Solution:
Statement 1: Correct — ?: is ternary operator returning one of two values. Statement 2: Correct — as operator safely attempts conversion to a reference/nullable type, returns null if incompatible. Statement 3: Incorrect — The operator is *, not &*, for pointer operations. Statement 4: Correct — -> is used in unsafe pointer code. Statement 5: Incorrect — [] are for array indexing; casts use ().Verification / Alternative check:Simple tests with arrays, pointers (in unsafe code), and casting confirm these behaviors.
Why Other Options Are Wrong:Options including 3 or 5 rely on incorrect statements.
Common Pitfalls:Confusing [] with type casting or misremembering pointer operators from C++ vs C#.
Final Answer:1, 2, 4