阅读下面的程序，回答问题 DATA SEGMENT BUF DB '1234' N=$-BUF BCD DB N DUP(?) DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START：MOV AX,DATA MOV DS,AX LEA SI,BUF MOV CX,N LEA DI,BCD+N-1 LOOP1：MOV AL,[SI] SUB AL,30H MOV [DI],AL INC SI DEC DI DEC CX JNE LOOP1 MOV AH,4CH INT 21H CODE ENDS END START 取消数据段的BCD存储区，将处理后的数据放回原处，应如何修改程序？
正确答案:
取消数据段的BCD存储区,将经处理后的数据放回原处,修改程序如下：
DATA SEGMENT
BUF DB '1234'
N=$-BUF
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START：MOV AX,DATA
MOV DS,AX
LEA SI,BUF
MOV CX,N
LOOP1：MOV AL,[SI]
SUB AL,30H
MOV [SI],AL
INC SI
DEC CX
JNE LOOP1
MOV AH,4CH
INT 21H
CODE ENDS
END START
DATA SEGMENT
BUF DB '1234'
N=$-BUF
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START：MOV AX,DATA
MOV DS,AX
LEA SI,BUF
MOV CX,N
LOOP1：MOV AL,[SI]
SUB AL,30H
MOV [SI],AL
INC SI
DEC CX
JNE LOOP1
MOV AH,4CH
INT 21H
CODE ENDS
END START
答案解析:有
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