Difficulty: Easy
Correct Answer: 1, 5
Explanation:
Introduction / Context:
This problem highlights that standard C# functions return a single value. It asks you to identify the compile-time errors introduced by attempting to assign two variables from a single function call and by attempting to return two values using a comma expression.
Given Data / Assumptions:
Concept / Approach:
In C#, a method returns exactly one value unless you use out/ref parameters or newer tuple-return syntax (not shown here). The comma between variables in an assignment target is not valid in this context. Likewise, return ss, cc; is not valid to return two values; the method returns int and must return a single int expression.
Step-by-Step Solution:
Verification / Alternative check:
Legal alternatives: use out parameters (e.g., fun(a, out s, out c)) or return a ValueTuple <int,int> and deconstruct: (s, c) = fun(a); with fun returning (int ss, int cc).
Why Other Options Are Wrong:
Common Pitfalls:
Assuming comma-separated returns or multi-target assignment works in C# without tuples or out/ref.
Final Answer:
1, 5
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