assume cs:code, ds:data data segment msg db 'The string is a palindrome','$' msg1 db 'The string is a palindrome','$' msg2 db 'The string is not a palindrome','$' strings db 'abccba', '1234321', 'sdsfds$','$' num_strings equ 3 str_len equ 7 data ends stack segment dw 100h dup(0) stack ends code segment start: mov ax, data mov ds, ax mov si, 0 ; 用si存储字符串的索引 mov cx, 0 mov cl, str_len dec cx mov di, cx ; 用di存储字符串的另一个索引（从后往前） shr cx, 1 mov bx, 0 cmp cx, bx jle palindrome ; 如果字符串长度为0或1，则直接判断是否为回文字符串 outer_loop: mov ah, 0 mov al, num_strings mul si ; 计算当前字符串在二维数组中的偏移量 add al, strings mov bx, ax ; 将偏移量存储在bx中 mov si, 0 ; 重置si和di mov di, str_len - 1 inner_loop: mov al, [bx+si] ; 从二维数组中读取字符 mov ah, [bx+di] cmp al, ah jne not_palindrome inc si dec di cmp si, di jle inner_loop palindrome: lea dx, msg1 mov ah, 09h int 21h inc si ; 检查下一个字符串 cmp si, num_strings jl outer_loop ; 如果还有字符串未判断，则继续循环 jmp exit_program not_palindrome: lea dx, msg2 mov ah, 09h int 21h inc si ; 检查下一个字符串 cmp si, num_strings jl outer_loop ; 如果还有字符串未判断，则继续循环 jmp exit_program exit_program: mov ah, 4ch int 21h code ends end start本题字符窜为空

如果字符串为空，则会发生错误，因为程序会尝试读取空指针地址的内容。此时需要对程序进行修改，添加对空字符串的判断，避免程序崩溃。可以在循环开始前添加对字符串长度的判断，如果长度为0，则直接跳过该字符串的判断。修改后的代码如下：

assume cs:code, ds:data

data segment
msg db 'The string is a palindrome','$'
msg1 db 'The string is a palindrome','$'
msg2 db 'The string is not a palindrome','$'
strings db 'abccba', '1234321', 'sdsfds$','$'
num_strings equ 3
str_len equ 7
data ends

stack segment
dw 100h dup(0)
stack ends

code segment
start:
    mov ax, data
    mov ds, ax
    mov si, 0            ; 用si存储字符串的索引
    mov cx, 0
    mov cl, str_len
    dec cx
    mov di, cx            ; 用di存储字符串的另一个索引（从后往前）
    shr cx, 1
    mov bx, 0
    cmp cx, bx
    jle palindrome       ; 如果字符串长度为0或1，则直接判断是否为回文字符串

outer_loop:
    mov ah, 0
    mov al, num_strings
    mul si                ; 计算当前字符串在二维数组中的偏移量
    add al, strings
    mov bx, ax            ; 将偏移量存储在bx中
    mov si, 0             ; 重置si和di
    mov di, str_len - 1

    ; 判断字符串是否为空
    mov al, [bx+si]
    cmp al, '$'
    je next_string

inner_loop:
    mov al, [bx+si]       ; 从二维数组中读取字符
    mov ah, [bx+di]
    cmp al, ah
    jne not_palindrome
    inc si
    dec di
    cmp si, di
    jle inner_loop

palindrome:
    lea dx, msg1
    mov ah, 09h
    int 21h
    inc si                ; 检查下一个字符串
    cmp si, num_strings
    jl outer_loop         ; 如果还有字符串未判断，则继续循环
    jmp exit_program

not_palindrome:
    lea dx, msg2
    mov ah, 09h
    int 21h
    inc si                ; 检查下一个字符串
    cmp si, num_strings
    jl outer_loop         ; 如果还有字符串未判断，则继续循环
    jmp exit_program

next_string:
    inc si                ; 检查下一个字符串
    cmp si, num_strings
    jl outer_loop         ; 如果还有字符串未判断，则继续循环
    jmp exit_program

exit_program:
    mov ah, 4ch
    int 21h

code ends
end start