Question

Zero address instructions are stack instructions

let the instructions be

PUSH #3

PUSH #5

ADD  ------------ Add's top 2 elements of stack and stores the result in top of stack

what if initially stack is empty and

PUSH #3

ADD ---------Then what elements are added ???

If I'm wrong Please correct me

Answer 1

ADD IS A BINARY OPERATOR ..MUST NEED TWO INPUT TO ADD....HOW CAN WE ADD WITH ONE ELEMENT

Comments

Thats what I'm asking what would be the result

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will it add with 0 ??

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What "ADD" does is as specified by the architecture.
@shivani no- it won't do that. It will just take wrong value from stack - say stack is assigned to be read from memory location 4000 and is growing up, then this will read from location 3996 (assuming 4 byte operand).