C#.NET — choose the valid ways to convert a Single (float) to a String.

Difficulty: Easy

s = (String)(f);
s = Convert.ToString(f);
s = f.ToString();
s = Clnt(f);
s = CString(f);

Correct Answer: s = Convert.ToString(f);

Explanation:

Introduction / Context:
Converting numeric types to strings is routine in C#.NET. The question presents several code snippets and asks which are valid for converting a Single (alias float) into a String.

Given Data / Assumptions:

Single f = 9.8f; then assign a string variable s.
Snippets may include syntax from other languages or invalid casts.

Concept / Approach:
In C#, use Convert.ToString or the instance ToString() method. Direct casting from float to string is illegal, and VB-specific functions like CString or Clnt do not exist in C#.

Step-by-Step Solution:

Valid: s = Convert.ToString(f); → uses framework converter.Valid: s = f.ToString(); → instance method on value type.Invalid: (String)(f) → no direct cast defined.Invalid: Clnt and CString → VB-style; not C# identifiers.

Verification / Alternative check:
Try formatting: f.ToString("F2") for 2 decimal places, demonstrating rich formatting support.

Why Other Options Are Wrong:
They are either syntactically invalid in C# or rely on non-existent conversion helpers.

Common Pitfalls:
Assuming a C-style cast will work for disparate types like float to string.

C#.NET — choose the valid ways to convert a Single (float) to a String.

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