27.asm

字符串逆序,这是第一次来上传东西,希望大家给个介意.

data segment
string1 db ' abcdefg'
count  equ $-string1
string2 db count dup(?),'$'
data ends
code segment
assume cs:code,ds:data
start:mov ax,data
      mov ds,ax
      mov cx,count
      mov si,offset string1
      add si,cx
      dec si
      mov di,offset string2
lop1: mov al,[si]
      mov [di],al
      dec si
      inc di
loop  lop1
mov dx,offset string2
mov ah,9
int 21h
mov ah,4ch
int 21h
code ends
end start