;检查两个字符串是否相同,若相同标志单元flag置0,否则置-1。
data segment
s1 db 'The Number is 0471-3974355'
org 20h
s2 db 'The number is 0471-3974355'     
                                     ;加org 40h后count的值为20h
count equ $-s2                       ;不能是$-s1
flag db ?
data ends
code segment
assume cs:code,ds:data,es:data
start: mov ax,data
       mov ds,ax
       mov es,ax
       lea si,s1
       lea di,s2
       mov cx,count
       cld
       repz cmpsb
       jnz j1
       mov flag,0
       jmp stop
j1:    mov flag,0ffh
stop:  mov ah,4ch    
       int 21h
code   ends
       end start