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  1.  
  2. bits 32             
  3.  
  4. section .data
  5.     num1 dd 15        
  6.     num2 dd 20         
  7.     msg db "Sum (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.  
  20.     add eax, ebx        
  21.  
  22.     mov al, al       
  23.     and al, 0x0F        
  24.  
  25.     cmp al, 0x0A
  26.     jl is_digit
  27.     add al, 0x37
  28.     jmp save_digit
  29.  
  30. is_digit:
  31.     add al, 0x30
  32.  
  33. save_digit:
  34.     mov [hex_digit], al
  35.     mov byte [hex_digit+1], 0
  36.  
  37.     mov eax, 4            
  38.     mov ebx, 1            
  39.     mov ecx, msg          
  40.     mov edx, 19           
  41.     int 0x80
  42.  
  43.     mov eax, 4
  44.     mov ebx, 1
  45.     mov ecx, hex_digit
  46.     mov edx, 1
  47.     int 0x80
  48.  
  49.     mov eax, 4
  50.     mov ebx, 1
  51.     mov ecx, newline
  52.     mov edx, 1
  53.     int 0x80
  54.  
  55.     mov eax, 1            
  56.     xor ebx, ebx
  57.     int 0x80
  58.  
Success #stdin #stdout 0s 5264KB
comments (?)
stdin
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Standard input is empty
stdout
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Sum (lower byte): 03
https://ideone.com/MF6BCr
language:
Assembler 32bit (nasm 2.14)
created:
1 day ago
visibility:
public

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