In C# terminology, how many values can a subroutine (a void method) effectively return?
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ADepends upon how many params arguments it uses.
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BAny number of values.
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CDepends upon how many ref arguments it uses.
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D0
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E1
Answer
Correct Answer: Depends upon how many ref arguments it uses.
Explanation
Introduction / Context:In some literature, a “subroutine” refers to a method that does not return a value via the return keyword (void). However, C# supports multiple output mechanisms beyond the single return value.
Given Data / Assumptions:
- A subroutine does not return a value with return.
- C# allows ref and out parameters to pass data back to the caller.
- params affects argument count, not return values.
Concept / Approach:While a void method cannot return a value directly, it can modify variables passed by reference using ref or out. Therefore, the number of effective values a subroutine can “return” depends on how many such by-reference parameters it has.
Step-by-Step Solution:
Recognize that void prohibits returning a value explicitly.Identify that ref/out parameters allow writing results back to caller variables.Conclude that the count of values is tied to the count of by-reference parameters.Verification / Alternative check:Inspect method signatures with multiple ref/out parameters and observe caller-side changes after invocation.
Why Other Options Are Wrong:
- params: Only changes how many inputs can be passed; does not affect outputs.
- Any number of values: Too broad without mechanism.
- 0 or 1: Too restrictive given ref/out.
Common Pitfalls:Equating “no return value” with “no way to pass results back.”
Final Answer:Depends upon how many ref arguments it uses.