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What will be the value in EAX after the following lines execute?mov eax, 1002FFFFhneg ax

Question

What will be the value in EAX after the following lines execute?

mov eax, 1002FFFFh
neg ax
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Solution

The given code is in Assembly language. Let's break it down:

  1. mov eax, 1002FFFFh: This line moves the hexadecimal value 1002FFFF into the EAX register.

  2. neg ax: This line negates the lower 16 bits of the EAX register.

The neg instruction computes the two's complement of the operand. The two's complement of a binary number is obtained by inverting the bits and adding 1 to the result.

The lower 16 bits of 1002FFFFh are 2FFFFh which is 0010 1111 1111 1111 in binary.

Inverting the bits gives 1101 0000 0000 0000 and adding 1 gives 1101 0000 0000 0001 which is D001h in hexadecimal.

So, after the neg ax instruction, the EAX register will contain 1002D001h.

This problem has been solved

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