C/C++ literals: By default, a real (floating) numeric literal such as 3.5 is treated as which type?

Introduction / Context:Literal types influence overload resolution, precision, and performance. In both C and C++, an unsuffixed real literal like 3.5 is assigned a default floating type unless a suffix changes it. Recognizing this default helps you pick correct function overloads and avoid unintentional narrowing conversions.

Given Data / Assumptions:

• No suffix is present (e.g., 'f' or 'L').
• We refer to standard language rules, not compiler extensions.
• The literal is written in decimal floating notation.

Concept / Approach:

• Unsuffixed floating literals are of type double.
• Adding 'f' or 'F' yields type float; adding 'l' or 'L' yields long double (subject to implementation specifics).
• There is no 'far double' in standard C/C++.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

• float/long double require explicit suffixes or contexts.
• far double: Not a standard type.

Common Pitfalls:

• Accidentally calling 'float' overloads with double arguments, causing extra casts or ambiguity.
• Assuming 'long double' is always higher precision; implementation details vary.

Final Answer: