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# Write an assembly program (MASM and Irvine’s libraries) that calculates the nth Fibonacci number.

INSTRUCTIONS TO CANDIDATES
###### ANSWER ALL QUESTIONS

Write an assembly program (MASM and Irvine’s libraries) that calculates the nth Fibonacci number.
To do this we need to calculate the series of Fibonacci numbers upto n
{F0=0; F1=1; F2=1; F3=F1+F2; F4=F3+F2; F5=F4+F3}

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

If we use 0, 1 and initial conditions the sequence of the first 6 numbers would be:
0, 1, 1, 2, 3, 5
^
6th

You will need to ask the user for the last number in the series is to be.. So if the user wants the
6th Fibonacci number your progam shoule print out 5.   If they want the 9th then 21
Ask/prompt the user for the index,or sequence umber   Use ReadDec to get value

Use the ebx, eax, and edx registers.
This is similar to our last project (see below)
BUT THIS TIME WE NEED TO USE ecx AS THE LOOP COUNTER

Some other specifications:
Format your code correctly (indent) and have the correct comments at top for the file
(see lecture note) Name the file 221xproj03<username>.asm (where x is your section number
and <username> is your campus username (i.e. login, toro-mail, etc). Do not use spaces,
capital letters or any special characters in the naming. submit (upload) just the .asm
file to the blackboard assignment link (type out full-name).

SOME HELP

READING a number from user

...
mov edx, offset prompt  ; copy the address of your byte array (string)
call WriteString        ; write your string to console
call ReadDec      ; read unsigned number from user
mov ecx, eax      ; save it into the loop counter (ECX is the loop counter)
...

LOOPS example
; print "hi" on the screen 10 times

mov ecx, 10             ; set loop counter to 10
TOP:                    ; label for top of the loop
mov edx, OFFSET msg  ; msg is byte array with "hi",13,10,0
call WriteString
loop TOP                ; does a dec ecx AND then if ECS != 0 jumps to TOP

; print 10,9,8,7,....2,1 to the screen
comaspace  BYTE ", ",0

mov ecx, 10             ; set loop counter
TOP:
mov eax, ecx            ; copy value in loop counter to eax
call WriteDec           ; print value in eax (same as ecx)
mov edx, OFFSET comaspace
call WriteString
loop top

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