ITPEC FE Subject A October 2025 Question 14

Superposition (Folding) Addressing — split the record key into equal parts and sum them to get the address.

Record key 123456, split into 123 and 456:

• •123 + 456 = 579 → use as address

Address calculation methods (indirect addressing):
- Folding / Superposition — split key into parts, sum them
- Hash (division) — divide key by a prime number, use remainder
- Radix conversion — convert key to a different base
- Direct addressing — use the key itself (no transformation)

Why not others:
- (a) Convert to octal (361100) — radix conversion, not folding
- (b) Divide by 997, remainder 825 — hash/division method
- (d) Use 123456 directly — direct addressing, not indirect

Key rule: "Folding" = split the key into equal-length segments and add them together.

AI-generated — may contain errors