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16.      What value will be in rax after the following operation(s)             Assume the code will...

16.      What value will be in rax after the following operation(s)

            Assume the code will assemble and run without error

            mov     rax,      0x10

            xor     rdx,     rdx

            mov     rbx,     0x4

            div     rbx

            A.        0x4

            B.         0x2

C.         0x25

            D.        0x0

17.      What value will be in rdx after the following operation(s)

            Assume the code will assemble and run without error

Note: This question is asking about RDX

            mov     rax,      0x10

            xor     rdx,     rdx

            mov     rbx,     0x4

            div     rbx

            A.        0x4

            B.         0x2

C.         0x25

            D.        0x0

18.      What value will be in rax after the following operation(s)

            Assume the code will assemble and run without error

mov     rax,      1010b

mov     rbx,     1100b

and      rax,      rbx

           

            A.        1110

            B.         1000

C.         0111

            D.        0110

19.      What value will be in rax after the following operation(s)

            Assume the code will assemble and run without error

            mov     rax,      1010b

            mov     rbx,     1100b

            or        rax,      rbx

            A.        1110

            B.         1000

C.         0111

            D.        0110

20.      What value will be in rax after the following operation(s)

            Assume the code will assemble and run without error

            mov     rax,      1010b

            mov     rbx,     1100b

            xor      rax,      rbx

A.        1110

            B.         1000

C.         0111

            D.        0110

21.      What value will be in rax after the following operation(s)

            Assume the code will assemble and run without error

            mov     rax,      0xAA

            shr       al,        2          

           
A.        AA

            B.         2A

C.         A8

            D.        EA

            E.         55

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Answer #1

(16)   What value will be in rax after the following operation(s):

mov     rax,      0x10

xor     rdx,     rdx

mov     rbx,     0x4

div     rbx

Answer: (A) 0x4

Description:

mov     rax,      0x10 ; Move the value 0x10 to rax register. rax = 0x10

xor     rdx,     rdx ; Set rdx to 0 value. rdx = 0x0

mov     rbx,     0x4  ; Move the value 0x4 to rbx register. rbx = 0x4

div     rbx ; Divide rax by rbx. Store the result in rax register and reminder in rdx register.

0x10 ÷ 0x4 = 0x4 with reminder 0x0.

rax = 0x4 and rdx = 0x0.

(17)  What value will be in rdx after the following operation(s):

mov     rax,      0x10

xor     rdx,     rdx

mov     rbx,     0x4

div     rbx

Answer: (D) 0x0

Description:

mov     rax,      0x10 ; Move the value 0x10 to rax register. rax = 0x10

xor     rdx,     rdx ; Set rdx to 0 value. rdx = 0x0

mov     rbx,     0x4  ; Move the value 0x4 to rbx register. rbx = 0x4

div     rbx ; Divide rax by rbx. Store the result in rax register and reminder in rdx register.

0x10 ÷ 0x4 = 0x4 with reminder 0x0.

rax = 0x4 and rdx = 0x0.

(18) What value will be in rax after the following operation(s):

mov     rax,      1010b

mov     rbx,     1100b

and      rax,      rbx

Answer: (B) 1000

Description:

mov     rax, 1010b ; Move the value 1010b to rax register. rax = 1010b

mov     rbx, 1100b ; Move the value 1100b to rbx register. rbx = 1100b

and      rax, rbx ;Perform the logical AND between rax and rbx register and store the result in rax register.

1010 AND 1100 = 1000

(19) What value will be in rax after the following operation(s):

mov     rax,      1010b

mov     rbx,     1100b

or        rax,      rbx

Answer: (A) 1110

Description:

mov     rax, 1010b ; Move the value 1010b to rax register. rax = 1010b

mov     rbx, 1100b ; Move the value 1100b to rbx register. rbx = 1100b

or rax, rbx ;Perform the logical OR between rax and rbx register and store the result in rax register.

1010 OR 1100 = 1110

(20) What value will be in rax after the following operation(s):

mov     rax,      1010b

mov     rbx,     1100b

xor      rax,      rbx

Answer: (D) 0110

Description:

mov     rax, 1010b ; Move the value 1010b to rax register. rax = 1010b

mov     rbx, 1100b ; Move the value 1100b to rbx register. rbx = 1100b

xor rax, rbx ;Perform the logical XOR between rax and rbx register and store the result in rax register.

1010 XOR 1100 = 0110

(21) What value will be in rax after the following operation(s):

mov     rax,      0xAA

shr       al,        2      

Answer: (B) 2A

Description:

mov     rax,      0xAA ; rax = 0xAA

shr       al,        2 ; Logical shift right register AL by 2 bits

Logical Shift Right 2 times AL value AA = 1010 1010 → shift → 0010 1010 = 2A

rax = 0x2A value.

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