GATE CSE 2026 | Set 1 | Question: 4

Question

Match each addressing mode in $\textbf{List I}$ with a data element or an element of a data structure (in a high-level language) in $\textbf{List II}$:
\[
\begin{array}{|l|l|}
\hline
{\textbf{List I}} & {\textbf{List II}} \\
\hline \hline
P.\ \text{Immediate} & 1.\ \text{Element of an array} \\
\hline
Q.\ \text{Indirect} & 2.\ \text{Pointer} \\
\hline
R.\ \text{Base with index} & 3.\ \text{Element of a record} \\
\hline
S.\ \text{Base with offset/displacement} & 4.\ \text{Constant} \\
\hline
\end{array}
\]

• A. $\mathrm{P}-4, \mathrm{Q}-3, \mathrm{R}-1, \mathrm{~S}-2$
• B. $\mathrm{P}-4, \mathrm{Q}-2, \mathrm{R}-1, \mathrm{~S}-3$
• C. $\mathrm{P}-1, \mathrm{Q}-4, \mathrm{R}-3, \mathrm{~S}-2$
• D. $\mathrm{P}-2, \mathrm{Q}-3, \mathrm{R}-1, \mathrm{~S}-4$

Comments

Addressing Mode	Think Like	High-Level Analogy	Quick Example
Immediate	value inside instruction	constant	x = 5
Direct	exact memory address given	global/static variable	LOAD 5000
Indirect	address contains another address	pointer	*p
Register	data already in CPU register	local fast variable	R1
Register Indirect	register stores memory address	pointer via register	[R1]
Base + Offset	fixed distance from base	structure/record field	student.age
Base + Index	changing index from base	array element	A[i]
Indexed	array traversal	arrays/strings	arr[i]
PC Relative	relative jump from current instruction	loops/branches	if, while jumps
Auto Increment	use then move next	array traversal iterator	*p++
Auto Decrement	move then use	stack push	--SP
Stack Addressing	top of stack operations	function calls	push/pop
Implied/Inherent	operand automatically known	accumulator operations	CMA

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@Jayvijay Chauhan source ?

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(for reference only)

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For clear Understanding refer this pdf 

https://people.scs.carleton.ca/~sivarama/asm_book_web/Instructor_copies/ch5_addrmodes.pdf

Answer 1

Answer is option $\boxed{B).\text{P-4, Q-2, R-1, S-3}}$

Immediate: Constant $(P\to 4)$

In Imm. Addressing mode the operand field of the instruction contains the actual data itself. 

Indirect :Pointer $(Q\to 2)$

Address field of the instruction points to a memory location which contains the effective address . This is similar to working of pointer. 

Base with index: Elements of an array $(R \to1)$

Base will hold the starting address of the array and index will tell us wihch element of the array we need. Both value can change here.  

Base with offset/displacement: Element of a record $(S\to 3)$

Here displacement would be a fixed value and Base will change. Like for example this is used to access linked list contents. where base acts as starting address of linked list node and displacement will  tell us which content of the Linked List to access. 

 

Good question to solve: https://gateoverflow.in/118291/gate-cse-2017-set-1-question-11

 

Answer 2

 

Answer 3

option B is Correct

P -----> 4

Q -------> 2

R --------> 1

S ---------> 3