Wire Format

What this C++ wire-format language-knowledge question tests

This is a hard C++ question that probes deep familiarity with how the language handles data layout, type conversions, and low-level memory representation. It is the kind of problem trading firms use to identify candidates who understand not just syntax, but the actual machine-level behaviour of their code—critical in high-performance and systems contexts where subtle bugs can be expensive.

To answer correctly, you need to reason about how types are packed in memory, how compilers handle implicit conversions, and what the actual output will be when that code runs. This tests your mental model of C++ semantics beyond what most tutorials cover, and rewards candidates who have debugged real programs or studied the standard closely.

• Type casting and implicit conversions
• Memory layout and alignment
• Operator precedence and evaluation order
• Output stream formatting defaults