In some homework, I have to create a Fibonacci Sequence program in Assembly. I created this code, but it doesn't seem to be working correctly and I am not sure as to why. I believe that I am doing this correctly, but EAX remains "2" every loop.
INCLUDE Irvine32.inc
.data
prev DWORD ?
next DWORD ?
val DWORD ?
count DWORD ?
total DWORD ?
myMsg BYTE "Fibonacci Sequence ",0dh,0ah,0
.code
main PROC
mov ecx,15
mov val,1
mov prev,-1
mov eax,1
mov edx,OFFSET myMsg
call WriteString
L1:
mov count,ecx
mov ebx,val
add ebx,prev
mov total,ebx
mov ebx,val
mov prev,ebx
mov eax,total
mov val, ebx
call WriteInt
call Crlf
loop L1
exit
main ENDP
END main
Could look like this (untested):
mov ecx, 15
mov eax, 0 ;a = 0
mov ebx, 1 ;b = 1
_fib:
mov edx, eax
add edx, ebx ;sum = a + b
mov eax, ebx ;a = b
mov ebx, edx ;b = sum
loop _fib