section .data
    arr     dw 10, 25, 33, 47, 58      ; массив из 5 чисел
    len     equ ($ - arr) / 2
    msg     db "Результат: ", 0
 
section .bss
    buffer  resb 20                    ; буфер для числа
 
section .text
    global _start
 
_start:
    ; --- Вычисление разницы ---
    movzx eax, word [arr]                     ; первый элемент
    movzx ebx, word [arr + (len - 1) * 2]     ; последний элемент
    sub   eax, ebx                            ; разница = первый - последний
 
    ; --- Вывод "Результат: " ---
    mov   rdi, msg
    call  print_string
 
    ; --- Преобразование и вывод числа ---
    mov   rdi, rax
    call  print_int
 
    ; --- Новая строка ---
    mov   rdi, 10
    call  print_char
 
    ; --- Выход ---
    mov   rax, 60      ; sys_exit
    xor   rdi, rdi     ; код 0
    syscall
 
; === Подпрограмма: вывод строки (rdi = адрес строки, завершённой нулём) ===
print_string:
    push rax
    push rbx
    push rcx
    push rdx
    mov rcx, rdi
    xor rdx, rdx
.strlen_loop:
    cmp byte [rcx + rdx], 0
    je .got_len
    inc rdx
    jmp .strlen_loop
.got_len:
    mov rax, 1         ; sys_write
    mov rdi, 1         ; stdout
    mov rsi, rcx
    ; rdx уже содержит длину
    syscall
    pop rdx
    pop rcx
    pop rbx
    pop rax
    ret
 
; === Подпрограмма: вывод одного символа (rdi = символ) ===
print_char:
    push rax
    push rdi
    mov [buffer], dil
    mov rax, 1
    mov rdi, 1
    mov rsi, buffer
    mov rdx, 1
    syscall
    pop rdi
    pop rax
    ret
 
; === Подпрограмма: вывод целого числа (rdi = число) ===
print_int:
    push rax
    push rbx
    push rcx
    push rdx
    push rdi
 
    mov rax, rdi        ; число в rax
    cmp rax, 0
    jge .positive
 
    ; Если отрицательное — выводим минус и делаем положительным
    mov dil, '-'
    call print_char
    neg rax
 
.positive:
    mov rbx, 10
    mov rcx, buffer + 19
    mov byte [rcx], 0   ; завершаем строку нулём
    dec rcx
 
.digit_loop:
    xor rdx, rdx
    div rbx             ; rax = rax / 10, rdx = остаток
    add dl, '0'
    mov [rcx], dl
    dec rcx
    test rax, rax
    jnz .digit_loop
 
    ; rcx+1 — начало строки цифр
    mov rdi, rcx
    inc rdi
    call print_string
 
    pop rdi
    pop rdx
    pop rcx
    pop rbx
    pop rax
    ret

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