CODEWITHSUNDEEP
assemblyx86-16
Lola
Lola

Reputation: 218

Sum elements in vector assembly

Could someone please explain to me why the following program won't show anything on screen? So what I tried to do is calculate the sum of a vector like so:

.model small
.stack 100h
.data
  vector db  1,2,3,4,5,6,7,8,9
  suma db 0
  count db 9
  msg db 10,13,"Sum is:$"

.code
  mov ax,@data
  mov ds,ax

  mov si,0
  xor si,si
  xor cx,cx
  mov cl,count
repeta:
  mov al,vector[si]
  add suma,al
  inc si
loop repeta

  mov bx,ax
  mov ah,09
  lea dx,msg
  int 21h
  mov ah,2
  mov dl,bl
  int 21h
  mov ah,2
  mov dl,bl
  int 21h

  mov ah,4ch
  int 21h    
end

Upvotes: 2

Views: 2250

Answers (1)

Sep Roland
Sep Roland

Reputation: 39556

mov bx,ax

There's nothing meaningful in AX at this point in the program. The value that you're after is in the suma variable.

Next code will show results provided the sum stays below 100.

mov ah, 09h
lea dx, msg
int 21h

mov al, suma     ;Result happens to be 55
aam              ;Tens go to AH, units go to AL
or  ax, "00"     ;Make ASCII characters
mov bx, ax       ;Move to safe place

mov ah, 02h
mov dl, BH       ;Display tens
int 21h
mov ah, 02h
mov dl, BL       ;Display units
int 21h

mov ah, 00h
int 16h          ;Wait for a key

Upvotes: 7

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