I\'m learning Assembly Language for x86 Processors <Question> Use a loop with in

Question

I'm learning Assembly Language for x86 Processors

<Question>

Use a loop with indirect or indexed addressing to reverse the elements of the integer array in place. Do not copy the elements to any other array. Use the SIZEOF, TYPEOF, and LENGHTOF operators to make the program as flexible as possible if the array size and type should be changed in the future. Optionally, you may display the modified array by calling the DumpMem method from the Irvine32 library. See chapter 5 for details.

Please also attach a screenshot of your output when running on Visual Studio 2015

Thank you!

Explanation / Answer

Hello

Try to execute the below code

If an infinite loop occurs then try to change the instruction in L1

jb L1

to

loop L1

CODE

INCLUDE Irvine32.inc

.DATA

intarray DWORD 20d,30d,90d,40d,70d,60d,10d

.CODE

main PROC

mov esi, offset intarray
mov ecx, lengthof intarray

lea edi,[esi+(lengthof intarray*sizeof intarray)-sizeof intarray]
L1:
mov eax,[esi]
mov ebx,[edi]
mov [edi],eax
mov [esi],ebx
add esi,sizeof intarray   
sub edi,sizeof intarray   
cmp esi,edi
jb L1   

call DumpRegs
call WriteInt

ret

;call DumpMem

exit

main ENDP

END main

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