C#.NET — What actually happens in: sample c; c = new sample(); Choose the correct interpretation.
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AIt will create an object called sample.
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BIt will create a nameless object of the type sample.
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CIt will create an object of the type sample on the stack.
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DIt will create a reference c on the stack and an object of the type sample on the heap.
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EIt will create an object of the type sample either on the heap or on the stack depending on the size of the object.
Answer
Correct Answer: 2, 4
Explanation
Introduction / Context:This examines reference vs object allocation in C#. For classes (reference types), variables hold references; the new operator allocates an instance (object) on the managed heap.
Given Data / Assumptions:
- sample is a class type.
- c is a local variable (stored as a reference).
Concept / Approach:In c = new sample(); the expression new sample() creates a new object; the object itself does not have an identifier (name) — only the reference variable c has a name. Hence it is sometimes described as creating a “nameless” object and storing its reference in c. The object lives on the managed heap; c is a reference (typically on the stack if local).
Step-by-Step Solution:
Declaration: sample c; → declares a reference variable c.Instantiation: new sample(); → allocates a new object on the heap.Assignment: c = (that object reference).Verification / Alternative check:Printing ReferenceEquals(c, null) after assignment returns false; GC can collect the object if no references remain.
Why Other Options Are Wrong:(a) implies the object gets the name sample; in fact, sample is the type name, not the object name. (c) and (e) are wrong because class objects are allocated on the managed heap in C#.
Common Pitfalls:Thinking objects of reference types can be stack-allocated by size or that the object itself has an identifier beyond its reference(s).
Final Answer:2, 4