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我正在嘗試使用masm做迴文檢查程序，並使用下面的代碼，但我總是沒有迴文作爲輸出，無法弄清楚爲什麼。請幫助修改代碼。該代碼在下面給出以供進一步澄清。 在此先感謝。masm迴文檢查輸出困境
read macro
mov ah,01h
int 21h
endm
write macro
mov ah,02h
int 21h
endm
assume cs:code,ds:data
data segment
a db 20 dup(?)
b db 20 dup(?)
msg1 db "enter text: $"
msg2 db "reverse string is: $"
msg3 db " palindrome$"
msg4 db " not palindrome$"
data ends
code segment
start:mov ax,data
mov ds,ax
mov es,ax
mov cx,0000h
lea si,a
lea dx,msg1
mov ah,09h
int 21h
r:read
cmp al,0dh
je l
mov [si],al
inc si
inc cx
jmp r
l:dec si
lea di,b
mov ax,cx
l1:mov dl,[si]
mov [di],dl
inc di
dec si
loop l1
l2:
mov cx,ax
lea si,b
lea dx,msg2
mov ah,9h
int 21h
w:mov dl,[si]
write
inc si
loop w
mov cx,ax
cld
lea si,a
lea di,b
l4:cmpsb
jne l5
loop l4
lea dx,msg3
mov ah,09h
int 21h
mov ah,4ch
int 21h
l5:lea dx,msg4
mov ah,09h
int 21h
mov ah,4ch
int 21h
code ends
end start
無論是輸入字符串它不給迴文。