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  1. section .data
  2.     a  db 0x01, 0x02, 0x03  ; a = 0x030201
  3.     b  db 0x05, 0x06, 0x07  ; b = 0x070605
  4.     c  db 0x09, 0x0A, 0x0B  ; c = 0x0B0A09
  5.     d  db 0x00, 0x00, 0x00  ; результат (3 байта)
  6.  
  7. section .text
  8.     global _start
  9.  
  10. _start:
  11.     ; Загружаем b в eax
  12.     movzx eax, byte [b]     
  13.     movzx ebx, byte [b+1]   
  14.     movzx ecx, byte [b+2]   
  15.     shl ecx, 16
  16.     shl ebx, 8
  17.     or eax, ebx
  18.     or eax, ecx  ; eax = b
  19.  
  20.     sub eax, 1   ; b - 1
  21.  
  22.     ; Загружаем a в ebx
  23.     movzx ebx, byte [a]
  24.     movzx ecx, byte [a+1]
  25.     movzx edx, byte [a+2]
  26.     shl edx, 16
  27.     shl ecx, 8
  28.     or ebx, ecx
  29.     or ebx, edx  ; ebx = a
  30.  
  31.     add eax, ebx ; b - 1 + a
  32.  
  33.     ; Загружаем c в ebx
  34.     movzx ebx, byte [c]
  35.     movzx ecx, byte [c+1]
  36.     movzx edx, byte [c+2]
  37.     shl edx, 16
  38.     shl ecx, 8
  39.     or ebx, ecx
  40.     or ebx, edx  ; ebx = c
  41.  
  42.     sub eax, ebx ; (b - 1 + a) - c
  43.  
  44.     ; Сохраняем результат в d (3 байта)
  45.     mov [d], al
  46.     shr eax, 8
  47.     mov [d+1], al
  48.     shr eax, 8
  49.     mov [d+2], al
  50.  
  51.     ; Завершаем программу
  52.     mov eax, 1      ; syscall: exit
  53.     xor ebx, ebx    ; status 0
  54.     int 0x80
Success #stdin #stdout 0s 5284KB
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https://ideone.com/bB0gD2
language:
Assembler 32bit (nasm 2.14)
created:
3 days ago
visibility:
public

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