DATA SEGMENT
DATA1 DB '?','24','$'
DATA2 DB '33','$'
STRING DB 's is : $'
DATA ENDS
PUBLIC JISUAN
CODE SEGMENT
JISUAN PROC FAR
ASSUME CS:CODE,DS:DATA
START: MOV AX,DATA
MOV DS,AX
MOV AL,DATA1
AND AL,DATA2
MOV DATA1,AL
; MUL CL
;MOV S, DX
;ADD S,30H
MOV AH,09H
MOV DX,OFFSET STRING
INT 21H
MOV AH,02H
MOV DL,BYTE PTR S
INT 21H
RET
JISUAN ENDP
CODE ENDS
END START
报错Microsoft (R) Macro Assembler Version 5.00
Copyright (C) Microsoft Corp 1981-1985, 1987. All rights reserved.
Object filename [add1.OBJ]:
Source listing [NUL.LST]:
Cross-reference [NUL.CRF]:
add1.asm(38): error A2009: Symbol not defined: S
50160 + 414960 Bytes symbol space free
0 Warning Errors
1 Severe Errors
G:\xpdos>
------解决方案--------------------
问题出现在这两句上：
;MOV S, DX
;ADD S,30H
S在哪里做的定义？它又不是寄存器变量。
------解决方案--------------------
汇编怎么到这里来了