Question

Fibonacci in Assembly code

Asked by: Barreraj1

Generate the first 21 members of the Fibonacci sequence, store them in Memory, and use Dump Memory to display the sequence using Assembly code for intel based computers.  I am trying to use use loops and jumps...Please help

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Asked On
2007-02-24 at 20:41:12ID22411670
Tags

fibonacci

,

assembly

,

code

Topics

Assembly Programming Language

,

C++ Programming Language

Participating Experts
2
Points
125
Comments
10

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Answers

 

by: MacroLandPosted on 2007-02-25 at 01:53:38ID: 18604587

I think you better check iterative fibonacci algorithm which will be more easier to handle with Assembly language

 

by: Barreraj1Posted on 2007-02-25 at 03:30:46ID: 18604736

Below is what I have found in the book but I don't know how to get the first 21 members:

INCLUDE Irvine32.inc
.data
fibonacci DWORD 100 dup (0)
.code
main PROC
mov edx,offset fibonacci
mov eax,1
mov ebx,1
mov ecx,49
@@:
mov DWORD PTR [edx],eax
mov DWORD PTR [edx+4],ebx
add eax,ebx
add ebx,eax
add edx,8
sub ecx,1
jnz @B
call DumpRegs
      exit
main ENDP
END main

 

by: MacroLandPosted on 2007-02-25 at 04:22:51ID: 18604818

I am not very familiar with assembly coding but here is the C++ code;

int begin=0,middle=1,sum=1;

      for(int i=0;i<21;i++)
      {
            cout<<sum<<"  ";
            begin=middle;
            middle=sum;
            sum=begin+middle;
      }

Regards,

 

by: BrianGEFF719Posted on 2007-02-25 at 19:31:50ID: 18607153

This should do it for you:

INCLUDE Irvine32.inc
.data
fibonacci DWORD 100 dup (0)
.code
main PROC
mov edx,offset fibonacci
mov eax,0
mov ebx,1
mov ecx,21
loop:
mov DWORD PTR [edx],eax
mov DWORD PTR [edx+4],ebx
add eax,ebx
add ebx,eax
add edx,8
sub ecx,1
cmp ecx,00h
jne loop
call DumpRegs
      exit
main ENDP
END main

 

by: BrianGEFF719Posted on 2007-02-25 at 19:34:01ID: 18607158

The code you provided pretty much does exactly what you want, except technically eax should start at 0, and ecx should start at 21.

 

by: Barreraj1Posted on 2007-02-26 at 12:58:14ID: 18612401

Thanks for your help...
JB

 

by: Barreraj1Posted on 2007-02-27 at 00:57:34ID: 18615498

Brian,
  I tried that code but I get an error on jne loop.  Please advise

 

by: BrianGEFF719Posted on 2007-02-27 at 07:47:11ID: 18617767

INCLUDE Irvine32.inc
.data
fibonacci DWORD 100 dup (0)
.code
main PROC
mov edx,offset fibonacci
mov eax,1
mov ebx,1
mov ecx,12
@@:
mov DWORD PTR [edx],eax
cmp ecx,1
je skip
mov DWORD PTR [edx+4],ebx
skip:
add eax,ebx
add ebx,eax
add edx,8
sub ecx,1
jnz @B
call DumpRegs
      exit
main ENDP
END main

 

by: Barreraj1Posted on 2007-02-27 at 18:19:14ID: 18622300

That works! Thanks a bunch

 

by: BrianGEFF719Posted on 2007-02-27 at 21:35:28ID: 18622911

You're very welcome.

20120131-EE-VQP-002

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