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. SincedValis a DWORD (32 bits or 4 bytes),dVal+2refers to the third and fourth bytes ofdVal. The original value ofdValis12345678h(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 indValinto the EAX register. After the second instruction,dValis0001 0010 0000 0000 0000 0011, which in hexadecimal is120003h.
So, after these instructions execute, EAX will contain the value 120003h.
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