Ampersand

What this operating-systems memory-addressing question tests

This is a straightforward C++ question about the distinction between different types of addresses in memory. It asks you to reason about what the ampersand operator returns when applied to a variable, and to classify the result correctly.

The question probes whether you understand the fundamental abstraction layers in operating systems: virtual vs. physical addresses, and how the C++ language exposes memory references at the user level. This is foundational knowledge for systems programming, especially in low-latency environments where you need to reason about memory layout, pointer semantics, and cache behaviour.

• Virtual and physical address spaces
• Memory management and address translation
• Pointer semantics in C++
• The role of the memory management unit (MMU)