Which of the following is NOT included in the pass systems?

Question

Options

• ASingle pass system
• BMultiple pass system
• CPass-exchange system
• DPass-control system

• A
  3% (1)
• B
  10% (3)
• C
  83% (25)
• D
  3% (1)

Explanation

Pass-exchange system is not a recognized category within pass systems - it is a fabricated term that does not correspond to any standard pass system type used in assembler or compiler design, making C the correct answer.

Why the distractors are wrong:

• A (Single pass system): This is a legitimate pass system in which the assembler or compiler processes the entire source code in exactly one scan, resolving symbols as it goes.
• B (Multiple pass system): Also valid - the source code is scanned more than once (commonly twice), allowing forward references and other complexities to be resolved across passes.
• D (Pass-control system): This refers to a mechanism that governs and coordinates how passes are executed and managed within the compilation or assembly process.

Memory tip: Think of pass systems as describing how many times or how source code is scanned - single, multiple, and the control of those passes all fit that logic. "Pass-exchange" implies swapping passes, which is not a concept in this domain, making it the clear outlier.

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