CODEWITHSUNDEEP
cassemblyfibonacci
Shawn
Shawn

Reputation: 2435

Fibonacci sequence in assembly language

Need some help understanding this more or less. We are just getting into loops and OFFSET operands and would appreciate some help. So here are my instructions:

Write an assembly language program using the LOOP instruction with indirect addressing mode that calculating the first 12 values in the Fibonacci number sequence, {1, 1, 2, 3, 5, 8, 13, …}. Place each value in the EAX register and display it with a call DumpRegs statement inside the loop.

Please use the following variable definition: Fibonacci BYTE 1, 1, 10 DUP (?)

Insert the following statements immediately after the loop. They will display the hexadecimal contents of the target string: mov esi, OFFSET Fibonacci ; offset the variables mov ebx,1 ; byte format mov ecx, SIZEOF Fibonacci ; counter call dumpMem ; display the data in the memory

If your program works correctly, you will see the following sequence of hexadecimal bytes on the screen when the program runs: 01 01 02 03 05 08 0D 15 22 37 59 90

    .data

Fibonacci BYTE 1, 1, 10 DUP (?)

.code
main PROC

  L1:

  mov   esi, OFFSET Fibonacci       ; offset the variables
  mov   ebx,1               ; byte format
  mov   ecx, SIZEOF Fibonacci       ; counter
  call  dumpMem             ; display the data in the memory


    exit                    ;exits to Operating System
    main ENDP

END main

So I know I need to make a loop statement, but am completely stuck on how to begin it. Any advice will be greatly appreciated!

Upvotes: 1

Views: 29931

Answers (2)

shama
shama

Reputation: 11

.586
.MODEL FLAT
INCLUDE io.h            ; header file for input/output
.STACK 4096


.DATA

resultLbl BYTE  "The result is", 0
sum     BYTE    11 DUP (?), 0

.CODE
_MainProc PROC

       mov eax,1
       mov ebx,1  ;  will store answer 
      dtoa  sum , eax
      output resultLbl , sum
      dtoa sum ,ebx 
      output  resultLbl ,sum
      mov ecx ,5
_for:
         mov edx , eax
     add edx , ebx
     dtoa sum ,edx
     output  resultLbl ,sum
     mov  eax ,ebx
     mov  ebx ,edx
     dec ecx
     cmp ecx , 0
     jne _for
     mov eax , 0
     ret


_MainProc ENDP
END

Upvotes: 1

David Cummins
David Cummins

Reputation: 988

I believe you just want to know how to create a loop in assembly. See the below for some examples:

x86 assembly programming loops with ecx and loop instruction versus jmp + j<condition>

Upvotes: 2

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