section .bss
    buffer resb 256         ; lưu chuỗi nhập vào
    buffer_len resb 20          ; lưu chuỗi số để in ra
section .data
    msg db "Hãy nhập chuỗi: ", 0
    msg_len equ $ - msg
section .text
    global _start
 
_start:
    ; ===== In thông báo =====
    mov rax, 1                  ; syscall write
    mov rdi, 1
    mov rsi, msg
    mov rdx, msg_len
    syscall
 
    ; ===== Đọc chuỗi từ bàn phím =====
    mov rax, 0                  ; syscall read
    mov rdi, 0
    mov rsi, buffer
    mov rdx, 256
    syscall
 
    ; rax = số byte đọc được (bao gồm cả newline nếu có)
    mov rcx, rax
    dec rcx         ; bỏ qua newline '\n' ở cuối
 
    ; ===== Chuyển số (rcx) sang chuỗi =====
    mov rax, rcx
    mov rdi, buffer_len + 19
    mov byte [rdi], 10      ; newline
    dec rdi
 
 
itoa_loop:
    mov rdx, 0
    mov rbx, 10
    div rbx
    add dl, 48
    mov [rdi], dl
    dec rdi
    test rax, rax
    jnz itoa_loop
 
	inc rdi
 
 
    ; ===== In độ dài =====
    mov rax, 1
    mov rsi, rdi
    mov rdi, 1
    mov rdx, buffer_len + 20   ; rdx = địa chỉ outbuf + 20
	sub rdx, rdi           ; rdx = rdx - rdi
 
    syscall
 
    ; ===== Thoát =====
    mov rax, 60
    mov rdi, 0
    syscall
 
 
 

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