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  1. section .data
  2.     prompt db "Enter a number (0 to exit): ", 0
  3.     binary db 10, "Binary: ", 0
  4.     newline db 10, 0 
  5.  
  6. section .bss
  7.     input resb 10
  8.  
  9. section .text
  10.     global _start
  11.  
  12. _start:
  13.     ; Display prompt
  14.     mov eax, 4
  15.     mov ebx, 1
  16.     mov ecx, prompt
  17.     mov edx, 26
  18.     int 0x80
  19.  
  20.     ; Read input
  21.     mov eax, 3
  22.     mov ebx, 0
  23.     mov ecx, input
  24.     mov edx, 10
  25.     int 0x80
  26.  
  27.     ; Null-terminate input safely
  28.     mov esi, eax
  29.     dec esi
  30.     mov byte [input + esi], 0
  31.  
  32.     ; Convert input string to integer
  33.     mov esi, input
  34.     call str_to_int
  35.     cmp eax, 0
  36.     je exit
  37.     mov ebx, eax
  38.  
  39.     ; Display "Binary:"
  40.     mov eax, 4
  41.     mov ebx, 1
  42.     mov ecx, binary
  43.     mov edx, 9
  44.     int 0x80
  45.  
  46.     ; Print binary representation
  47.     call print_binary
  48.  
  49.     ; Print newline
  50.     mov eax, 4
  51.     mov ebx, 1
  52.     mov ecx, newline
  53.     mov edx, 1
  54.     int 0x80
  55.  
  56.     jmp _start
  57.  
  58. exit:
  59.     mov eax, 1
  60.     xor ebx, ebx
  61.     int 0x80
  62.  
  63. ; -----------------------------------------
  64. ; Convert string at [esi] to integer in eax
  65. str_to_int:
  66.     xor eax, eax
  67.     xor ecx, ecx
  68. .loop:
  69.     mov cl, byte [esi]
  70.     cmp cl, 0
  71.     je .done
  72.     sub cl, '0'
  73.     imul eax, eax, 10
  74.     add eax, ecx
  75.     inc esi
  76.     jmp .loop
  77. .done:
  78.     ret
  79.  
  80. ; -----------------------------------------
  81. ; Print binary representation of EBX
  82. print_binary:
  83.     mov eax, ebx
  84.     mov ecx, 32
  85.     mov edx, 0
  86.     mov esi, 1
  87.     shl esi, 31       ; Highest bit mask
  88.     mov edi, 0        ; Flag: first 1 printed
  89.  
  90. .loop:
  91.     test eax, esi
  92.     jz .maybe_skip
  93.     mov edi, 1
  94.     mov dl, '1'
  95.     jmp .print
  96.  
  97. .maybe_skip:
  98.     cmp edi, 0
  99.     je .skip
  100.     mov dl, '0'
  101.  
  102. .print:
  103.     mov [input], dl
  104.     mov eax, 4
  105.     mov ebx, 1
  106.     mov ecx, input
  107.     mov edx, 1
  108.     int 0x80
  109.  
  110. .skip:
  111.     shr esi, 1
  112.     dec ecx
  113.     jnz .loop
  114.     ret
  115.  
Success #stdin #stdout 0s 5312KB
comments (?)
stdin
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Standard input is empty
stdout
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Enter a number (0 to exit)
https://ideone.com/oPVcSv
language:
Assembler 32bit (nasm 2.14)
created:
2 days ago
visibility:
public

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