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  1. section .bss
  2.  msg resb 1 ; reserva 1 byte para um caractere
  3.  
  4. section .data
  5.  
  6. section .text
  7.  global _start
  8.  
  9. _start:
  10. ; Lê 1 caractere do teclado
  11.  mov eax, 3 ; sys_read
  12.  mov ebx, 0 ; stdin
  13.  mov ecx, msg ; onde armazenar
  14.  mov edx, 5 ; quantos bytes
  15.  int 0x80 ; chamada de sistema
  16.  jmp validar
  17.  
  18. validar:
  19.  mov al, [msg]
  20.  cmp al, 'A'
  21.  jl exit
  22.  cmp al, 'Z'
  23.  jle trocar
  24.  
  25. trocar:
  26.  mov al, [msg]
  27.  or al, 32
  28.  mov [msg], al
  29.  jmp imprime_caractere
  30.  
  31.  imprime_caractere:
  32.  mov eax, 4 ; sys_write
  33.  mov ebx, 1 ; stdout
  34.  mov ecx, msg ; endereço da string
  35.  mov edx, 5 ; tamanho da string (8 chars + newline)
  36.  int 0x80 ; chamada de sistema
  37.  jmp exit
  38.  
  39. exit:
  40.  mov eax, 1 ; sys_exit
  41.  mov ebx, 0
  42.  int 0x80
Success #stdin #stdout 0s 5324KB
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https://ideone.com/JHvJH3
language:
Assembler 32bit (nasm 2.14)
created:
5 hours ago
visibility:
public

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