sub.asm

自己做的程序

DATAREA   SEGMENT
  X      DB    0c6H
  Y      DB    14H
  RS     DB    
DATAREA   ENDS
CODE     SEGMENT 
ASSUME   CS:CODE,DS:DATAREA

START:
MOV AX,DATAREA
MOV DS,AX
MOV AL,X
SUB AL,Y
MOV RS,AL
;输出X
MOV AL,X
MOV CL,4
SHR AL,CL
ADD AL,30H
MOV DL,AL
CMP DL,39H
JLE P1
ADD DL,07H
P1:   MOV  AH,02H
INT 21H
MOV DL,X
AND DL,0FH
ADD DL,30H
CMP DL,39H
JLE P2
ADD DL,07H
P2:   INT 21H
;输出+
MOV DL,'-'
INT 21H
;输出Y
MOV AL,Y
MOV CL,4
SHR AL,CL
ADD AL,30H
MOV DL,AL
CMP DL,39H
JLE P3
ADD DL,07H
P3:   MOV  AH,02H
INT 21H
MOV DL,Y
AND DL,0FH
ADD DL,30H
CMP DL,39H
JLE P4
ADD DL,07H
P4:   INT 21H
;输出=
MOV DL,'='
INT 21H
;输出结果
MOV AL,RS
MOV CL,4
SHR AL,CL
ADD AL,30H
MOV DL,AL
CMP DL,39H
JLE P5
ADD DL,07H
P5:   MOV  AH,02H
INT 21H
MOV DL,RS
AND DL,0FH
ADD DL,30H
CMP DL,39H
JLE P6
ADD DL,07H
P6:   INT 21H
;返回操作系统 
MOV AH,4CH
INT 21H
code   ends
       end   START