Addressing Mode Matching Guide

This solution explains the matching between different addressing modes (List I) and their corresponding data elements or structures (List II) commonly found in computer architecture and programming.

Addressing Mode Explanations

• P. Immediate: This mode uses the operand value directly as part of the instruction. It directly matches with 4. Constant.
• Q. Indirect: This mode uses a register or memory location that holds the address of the actual operand. This is the definition of a 2. Pointer.
• R. Base with index: This mode calculates the effective address by summing a base address with an index value. This technique is primarily used for accessing an 1. Element of an array.
• S. Base with offset/displacement: This mode computes the effective address by adding a base address to a fixed offset or displacement. This is commonly employed to access fields within a 3. Element of a record or structure.

Final Match Summary

The correct pairings derived from the explanations are:

• P – 4 (Immediate – Constant)
• Q – 2 (Indirect – Pointer)
• R – 1 (Base with index – Element of an array)
• S – 3 (Base with offset/displacement – Element of a record)

This results in the complete match: P–4, Q–2, R–1, S–3.