Array, Array, go away, come again another day.

What this C++ language-knowledge question tests

This is a medium-difficulty question that probes your understanding of C++ array semantics and how they interact with common language features. It rewards careful attention to declaration syntax, type rules, and standard-library behavior rather than memorization.

To answer questions like this, you need to trace through the program mentally, understanding how arrays behave in different contexts—particularly their relationship to pointers, how they decay in function calls, and what operations are valid on array types. These details matter in production C++ code, especially in performance-critical domains like quantitative trading where implicit conversions and type subtleties can hide bugs.

• Array-to-pointer decay and its exceptions
• Array declaration vs. array initialization syntax
• Type deduction and template instantiation with arrays
• Standard-library container interaction with C-style arrays