section .text

global _start ;must be declared for linker (ld)

_start:

mov eax,3 ;number bytes to be summed

mov ebx,0 ;EBX will store the sum

mov ecx, x ;ECX will point to the current element to be summed

top: add ebx, [ecx]

add ecx,1 ;move pointer to next element

dec eax ;decrement counter

jnz top ;if counter not 0, then loop again

done:

add ebx, '0'

mov [sum], ebx ;done, store result in "sum"

display:

mov edx,1 ;message length

mov ecx, sum ;message to write

mov ebx, 1 ;file descriptor (stdout)

mov eax, 4 ;system call number (sys_write)

int 0x80 ;call kernel

mov eax, 1 ;system call number (sys_exit)

int 0x80 ;call kernel

section .data

global x

x:

db 2

db 4

db 3

sum:

db 0

Click here to compile and execute assembly code.

Change the program to display F as a sum of the array.