编写汇编语言程序实现键盘输入字符串（最多64位），统计其中数字的个数，并在屏幕上以十六进制的形式输出

以下是汇编语言程序的实现：

section .data
    input db 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
    output db "Number of digits: ", 0
    hex_output db "0x", 0, 0, 0, 0
    newline db 0Ah, 0

section .text
    global _start

_start:
    ; Read input from keyboard
    mov eax, 3      ; System call for reading input
    mov ebx, 0      ; File descriptor for keyboard input
    mov ecx, input  ; Address of input buffer
    mov edx, 64     ; Maximum number of characters to read
    int 0x80

    ; Count the number of digits
    xor eax, eax
    xor ebx, ebx
loop_start:
    mov bl, byte [input + eax]  ; Load next character
    cmp bl, 0                   ; End of string?
    je end_loop
    cmp bl, '0'                 ; Is it a digit?
    jl not_digit
    cmp bl, '9'
    jg not_digit
    inc ebx                     ; Increment digit count
not_digit:
    inc eax                     ; Move to next character
    jmp loop_start
end_loop:
    ; Convert digit count to hex and print to screen
    mov eax, ebx
    mov ebx, 16
    div ebx         ; Divide by 16
    add edx, '0'    ; Convert remainder to ASCII
    cmp edx, '9'
    jle skip_add    ; Skip if remainder is less than 10
    add edx, 7      ; Add offset for hex digits A-F
skip_add:
    mov byte [hex_output + 2], dl  ; Store least significant digit
    mov ecx, hex_output             ; Address of output buffer
    mov eax, 4                      ; System call for printing output
    mov ebx, 1                      ; File descriptor for screen output
    mov edx, 4                      ; Number of characters to print
    int 0x80

    ; Print newline character to screen
    mov eax, 4      ; System call for printing output
    mov ebx, 1      ; File descriptor for screen output
    mov ecx, newline
    mov edx, 2      ; Number of characters to print
    int 0x80

    ; Exit program
    mov eax, 1      ; System call for exiting program
    xor ebx, ebx    ; Exit status code
    int 0x80

此程序使用系统调用来读取键盘输入，统计数字的数量并将其转换为十六进制格式输出。请注意，此程序仅适用于 x86 架构的 Linux 系统。