Question

( Assembly Language )

Write a program that computes the 7th fibonacci number.

The fibonacci sequence -

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, …

what is the initialization of a, b, and d?

-	a	b	d
1	?	?	1
2	?	?	1
3	1	1	2
4	1	2	3
5	2	3	5
6	3	5	8
7	5	8	13

wrong initialization

-	a	b	d
1	0	1	1
2	1	1	2
3	1	2	3
4	2	3	5
5	3	5	8
6	5	8	13
7	8	13	21

the following statements are the body of the loop

a := b

b := d

d := a + b

your assembly language code begins here:

N dword 7

FibN dword ?

…

mov ecx, N

mov eax, 0

mov ebx, 1

toploop:

     …

loop toploop

mov FibN, edx

Answer 1

.MODEL SMALL

.DATA
        NUM_1  DB ?
        NUM_2  DB ?
        NUM_3  DB ?
        V1     DB ?
        V2     DB  ?
        NL     DB  '  ', 0DH,0AH,'$'
        

.CODE                   
       MAIN PROC
                MOV AX,@DATA
                MOV DX,AX
                MOV CX,10
                MOV CH,0
                
                MOV NUM_1,0
                MOV NUM_2,1

                MOV DL,NUM_1
                
                OR  DL,30H
                MOV AH,02H
                INT  21H

                MOV DL,NUM_2
                OR DL,30H
                
                MOV AH,02H
                INT 21H

                
               L1:
                        
                        MOV AL,NUM_1
                        ADD AL,NUM_2
                        MOV AH,0
                        MOV BL,AL
                        MOV DL,10
                        DIV DL
                        ADD AX,3030H

                        MOV V1,AL
                        MOV V2,AH

                        MOV DL,V1
                        MOV AH,02H
                        INT 21H
                        
                        MOV DL,V2
                        MOV AH,02H
                        INT 21H



                SHIFT:
                        MOV AL,NUM_2
                        MOV NUM_1,AL
                        MOV NUM_2,BL
                        LOOP L1

                MOV AX,4C00H
                INT 21H

        MAIN ENDP
       END MAIN
       
;*********************************************
;               OUTPUT
;*********************************************

;0 1 1 02 03 05 08 13 21 34 55 89