Made Easy Test Series: Stack Address

Question

A stack based CPU executes the instruction. Memory location $500$ contain $0X 88$ and memory location $700$ contain $0X37$. The stack pointer is at $0X003F$

The instruction are as follows:

$I_{1}:PUSH$  $500$

$I_{2}:PUSH$. $700$

$I_{3}:ADD$

$I_{4}:POP$. $600$

$I_{5}:PUSH$  $300$

Now which of the following is correct?

$A)$ Stack pointer will be $0X0040$ after executing instructions.

$B)$  Memory location $0X40$ contain $0X88$ after execution of instruction.

$C)$  Memory location $600$ contain $0XBF$ after execution of instruction.

$D)$ Both $a)$ and $c)$

Comments

Option (C):

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As there will not be any change in memory location 40 after the execution of the above set of instructions so option B) should also be true...

and memory location 600 contains 0XBF so C) is true.  

i.e. both B) & c) should be the correct Answers.

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Since 0X88 is initially stored at memory location 500 then how will 0X88 move to 0X40.

Memory location 0X40 never stored 0X88

Answer 1

since the memory location 600 is popped when the stack pointer was pointing to the sun 0X88  so clearly the location of 0X88 is 600. Therefore option “c” is correct.