DATA SEGMENT
ORG 10H
X DW 1
ORG 20H
Y DW 2
ORG 30H
Z DW ?
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX
MOV AX,X
SUB AX,Y
JGE NEXT;如果是无符号数就改成JAE
NEG AX
NEXT:MOV Z,AX
MOV AX,4C00H
INT 21H
CODE ENDS
END START
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