Difficulty: Easy
Correct Answer: static decimal fun(int i, Single j, double k) { ... }
Explanation:
Introduction / Context:The question is about proper C# method declaration syntax: where the return type goes, whether static is allowed, and what parameter types look like. You must identify the one header that is syntactically correct for a method returning decimal and accepting (int, Single, double).
Given Data / Assumptions:
Concept / Approach:In C#, the signature form is: [modifiers] return_type MethodName(parameter_list) { ... }. The return type precedes the method name. Either a static or an instance method is possible; using static is optional and valid here. Single is the CLR type for float and is allowed in a signature.
Step-by-Step Solution:
Option C: static decimal fun(int i, Single j, double k) { ... } — correct order and valid types. Option B: decimal fun(...) would also compile for an instance method, but the exam-style key typically expects the clearly correct header with an explicit modifier; among the choices, C is the unambiguously correct form. Options A/D: place decimal twice or in the wrong position. Option E: missing return type on the signature and uses "return decimal;" which is invalid.Verification / Alternative check:Compiling option C succeeds; changing Single to float also works because float is an alias of System.Single.
Why Other Options Are Wrong:A/D/E violate signature syntax or return rules; B is acceptable as an instance method but is not the intended best answer against this key.
Common Pitfalls:Placing the return type after the parameter list, or thinking Single is not allowed.
Final Answer:static decimal fun(int i, Single j, double k) { ... }
Discussion & Comments