What will be the value in EAX after the following lines execute?mov eax, 30020000hdec ax
Question
What will be the value in EAX after the following lines execute?
mov eax, 30020000h
dec ax
Solution
The value in EAX after the following lines execute will be 3001FFFFh.
Here's the step by step explanation:
-
The first line
mov eax, 30020000h
moves the hexadecimal value 30020000h into the EAX register. So, EAX now contains 30020000h. -
The second line
dec ax
decrements the value in the AX register by 1. AX is the lower 16 bits of the EAX register. So, this operation will not affect the higher 16 bits (3002h) of EAX, but will decrement the lower 16 bits (0000h) by 1. -
Since 0000h - 1 underflows, it wraps around to the maximum 16-bit value, which is FFFFh.
-
Therefore, after these two lines execute, the value in EAX will be 3001FFFFh.
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