29.asm

字符串逆序,这是第一次来上传东西,希望大家给个介意.

Maxlengh=254
data  segment
STRG db Maxlengh
      db ?
      db Maxlengh dup(?),'$'
data ends
code segment
assume cs:code,ds:data
start: mov ax,data
       mov ds,ax
       mov dx,offset STRG
       mov ah,0ah
       int 21h
       mov di,offset STRG+1
       mov cl,ds:[di]
     mov ch,00h
     add di,cx
 lop: mov dl,[di]
      dec di
      mov ah,02h
      int 21h
      loop lop
      mov ah,01h
      int 21h
      mov ah,4ch
      int 21h
code ends
    end start