fp compatibility

What this C++ type-compatibility interview question tests

This is a medium-difficulty question that probes your working knowledge of C++ type rules, implicit conversions, and the stricter type-checking introduced in modern C++ standards. It rewards precision: the ability to spot where the compiler will reject an assignment without running the code.

To solve problems like this, you need to understand which conversions the language permits implicitly, which require explicit casts, and how C++17 and later standards tighten the rules around narrowing conversions, floating-point assignments, and type compatibility. Interviewers use these questions to verify that you can reason about code correctness at compile time, not just runtime.

• Implicit vs. explicit type conversion
• Narrowing conversions and aggregate initialization
• Floating-point and integral type compatibility
• Modern C++ standard constraints