What value will EAX contain after the following instructions execute?.datadVal DWORD 12345678h.codemov ax, 3mov WORD PTR dVal+2, axmov eax, dVal
Question
What value will EAX contain after the following instructions execute?
.data
dVal DWORD 12345678h
.code
mov ax, 3
mov WORD PTR dVal+2, ax
mov eax, dVal
Solution
The instructions are written in Assembly language. Here's a step-by-step explanation:
-
mov ax, 3
: This instruction moves the value 3 into the AX register. AX is the lower 16 bits of the EAX register. -
mov WORD PTR dVal+2, ax
: This instruction moves the value in AX (which is 3) into the memory location atdVal+2
. SincedVal
is a DWORD (32 bits or 4 bytes),dVal+2
refers to the third and fourth bytes ofdVal
. The original value ofdVal
is12345678h
(in hexadecimal), which in binary is0001 0010 0011 0100 0101 0110 0111 1000
. The third and fourth bytes are0101 0110 0111 1000
, which will be replaced by0000 0000 0000 0011
(the binary representation of 3). -
mov eax, dVal
: This instruction moves the value indVal
into the EAX register. After the second instruction,dVal
is0001 0010 0000 0000 0000 0011
, which in hexadecimal is120003h
.
So, after these instructions execute, EAX will contain the value 120003h
.
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