7. What value will EAX contain after the following instructions execute? .data d

Question

7. 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

8. Use the following variable definitions to answer parts A, B, and C:

.data

var1 SBYTE -4,-2,3,1

var2 WORD 1000h,2000h,3000h,4000h

var3 SWORD -16,-42

var4 DWORD 1,2,3,4,5

A) For each of the following statements, state whether or not the instruction is valid:

a. mov ax,var1

b. mov ax,var2

c. mov eax,var3

d. mov var2,var3

e. movzx ax,var2

f. movzx var2,al

g. mov ds,ax

h. mov ds,1000h

Explanation / Answer

7. eax = 12341237h

8.

a. mov ax,var1 // not valid

b. mov ax,var2 // Valid

c. mov eax,var3 // not valid

d. mov var2,var3 // not valid

e. movzx ax,var2 // not valid both ax and var2 are same size

f. movzx var2,al // not valid destinatio cannot be memory operand

g. mov ds,ax // valid

h. mov ds,1000h // not valid

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