CODEWITHSUNDEEP
assemblyemu8086
PoorProgrammer
PoorProgrammer

Reputation: 121

How to access an element of a 2D array in assembly?

How to access an element of a 2D array in assembly? I found a few code examples, but they are using edx and eax registers, which are not supported by emu8086 (16-bit registers only).
I want to make variable t equal to the value of array[0][1] (t = 2).
What should I do? 

.8086
.model small
.stack 100h

.data 

    t dw ?

    array   dw 1, 2, 3,
            dw 4, 5, 6,
            dw 7, 8, 9

.code 
    ; ax <- array[0][1]
    mov eax, DWORD PTR[array + 8] ; not working
    ; t <- ax
    mov t, eax ; t = 2

Upvotes: 2

Views: 2122

Answers (1)

Sep Roland
Sep Roland

Reputation: 39691

I want to make variable t equal to the value of array[0][1] (t = 2).

The array is filled with words. The 2nd element on the 1st row is at offset 2 in the array.

mov ax, [array + 2]
mov [t], ax

Depending on the assembler the last line could read:

mov t, ax

Since you're working with .model small, did you setup the DS segment register?

If you change to .model tiny, you wouldn't need to setup any segment registers.

Upvotes: 3

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