assume cs:code ,ds:datadata segmentda1 db 'acdefghijklmnopqrstuvwxyz'db '$'data endscode segmentstart: mov ax,data mov ds,axxor bx,bx
;BX统计字符个数,AX统计A或a个数 xor ax,ax again:cmp da1[bx],'$'
;检测结束符 je exit cmp da1[bx],'A'
;检测A jne next1 inc ax jmp next2
next1:
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