Assignment Mechanics

What this C++ assignment mechanics question tests

This is a medium-difficulty C++ language-knowledge question that probes your understanding of how assignment operators work and the order in which expressions are evaluated. It rewards careful reading of code semantics over guessing at output.

To answer correctly, you need to understand the difference between reference semantics and value semantics in assignment, how compound assignment operators interact with their operands, and the precise sequence in which side effects occur during expression evaluation. These details matter in production C++ code, especially in high-frequency systems where subtle bugs can cause costly errors.

• Assignment operator return values and chaining
• Order of evaluation in complex expressions
• Reference vs. copy semantics
• Side effects and their timing