Question

Which of the following instruction format is used by stack-organised computer?

• A. Zero-Address Instructions
• B. One-Address Instructions
• C. Two-Address Instructions
• D. Three-Address Instructions

Hint:

In stack-organised computers, operands are implicitly taken from the stack, and results are returned to the stack, requiring no explicit operand addresses.

Answer 1

The Correct Option is A

Step 1: Stack-Organised Computer Architecture.
A stack-organised computer utilizes a stack for storing operands and results, with instructions operating on the stack in a Last-In-First-Out (LIFO) manner.

Step 2: Instruction Addressing Formats.
- Zero-Address Instructions: Operands are implicitly sourced from and results are implicitly placed onto the stack. This is characteristic of stack-organised computers.- One-Address Instructions: One operand is explicitly stated, while the second is implicitly retrieved from the stack.- Two-Address Instructions: Requires two explicit operands; common in register or accumulator architectures.- Three-Address Instructions: Specifies three operands; frequently employed in sophisticated processors.

Step 3: Determination.
The appropriate choice is (A) Zero-Address Instructions, consistent with the operational principles of stack-organised computers.