bits 32
global start
extern exit; tell nasm that exit exists even if we won't be defining it
import exit msvcrt.dll; exit is a function that ends the calling process. It is defined in msvcrt.dll
; our data is declared here (the variables  needed by our program)
segment data use32 class=data
    sir db 'bcdefgha'
    len equ ($-sir);lungimea sirului (in dublucuvinte)
    swap db 0
; our code starts here
segment code use32 class=code
    start:
        mov esi, 0
        comparison:
            mov al, [sir + esi]
            cmp al, [sir + esi+ 1]
            jb noswap
                mov dl, [sir+esi+1]
                mov [sir+esi+1], al
                mov [sir+esi], dl

                mov byte[swap], 1
            noswap:
            add esi, 1
            cmp esi, len-1
            jnz comparison

            cmp byte[swap], 0
            jnz start
        push dword 0; push the parameter for exit onto the stack
        call [exit]; call exit to terminate the program