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This scares me. is a hard quant interview question on language knowledge in Cpp.
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This is a hard C++ question that probes deep familiarity with language semantics, particularly around subtle behaviours that trip up even experienced developers. It rewards candidates who read and reason about code carefully rather than relying on intuition alone.
Questions of this type appear in technical interviews because they distinguish between candidates who have memorised API patterns and those who understand the underlying rules governing scope, lifetime, type conversion, operator precedence, or undefined behaviour. The ability to predict exact output—or to recognise when behaviour is unspecified—is valuable in systems programming and high-frequency trading, where correctness is non-negotiable.