Programming construct terminology: Using one CASE construct inside another CASE construct in HDL is known as ________.

Introduction / Context:
HDL source code frequently uses selection constructs such as CASE to implement decision trees. When designs require multi-level decisions, a CASE may appear inside another CASE. Knowing the correct term avoids confusion in code reviews and documentation.

Given Data / Assumptions:

• Language: VHDL or Verilog.
• Construct: CASE-of alternatives.
• Scenario: A CASE statement is placed inside another CASE statement.

Concept / Approach:
The standard software and HDL term for putting one control structure inside another of the same or different type is “nesting.” This applies to CASE, IF, loops, and other block constructs. It does not imply looping or special behavior beyond hierarchical decision-making.

Step-by-Step Solution:

Verification / Alternative check:
Language references and coding guidelines use the term “nested CASE” consistently.

Why Other Options Are Wrong:

Common Pitfalls:
Creating deep nesting that harms readability; forgetting default/others cases, which can infer latches or leave signals unassigned.

Final Answer:
nesting