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
Solution
The given code is in Assembly language. Let's break it down:
-
mov eax, 1002FFFFh
: This line moves the hexadecimal value1002FFFF
into the EAX register. -
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
.
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