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  1. bits 32             
  2.  
  3. section .data
  4.     num1 dd 250        
  5.     num2 dd 10         
  6.     num3 dd 5          
  7.     msg db "Result (lower byte): 0x", 0
  8.     newline db 10
  9.  
  10. section .bss
  11.     hex_digit resb 2
  12.  
  13. section .text
  14.     global _start
  15.  
  16. _start:
  17.     mov eax, [num1]
  18.     mov ebx, [num2]
  19.     mov ecx, [num3]
  20.  
  21.     add eax, ebx
  22.  
  23.     sub eax, ecx
  24.     mov al, al
  25.     and al, 0x0F        
  26.  
  27.     cmp al, 0x0A
  28.     jl is_digit
  29.     add al, 0x37
  30.     jmp save_digit
  31.  
  32. is_digit:
  33.     add al, 0x30
  34.  
  35. save_digit:
  36.     mov [hex_digit], al
  37.     mov byte [hex_digit+1], 0
  38.  
  39.     mov eax, 4            
  40.     mov ebx, 1            
  41.     mov ecx, msg          
  42.     mov edx, 20           
  43.     int 0x80
  44.  
  45.     mov eax, 4
  46.     mov ebx, 1
  47.     mov ecx, hex_digit
  48.     mov edx, 1
  49.     int 0x80
  50.  
  51.     mov eax, 4
  52.     mov ebx, 1
  53.     mov ecx, newline
  54.     mov edx, 1
  55.     int 0x80
  56.  
  57.     mov eax, 1            
  58.     xor ebx, ebx
  59.     int 0x80
  60.  
Success #stdin #stdout 0s 5272KB
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stdin
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Standard input is empty
stdout
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Result (lower byte):F
https://ideone.com/hranao
language:
Assembler 32bit (nasm 2.14)
created:
3 hours ago
visibility:
public

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