1.1 程序修改 .486
DATA SEGMENT USE16 SUM DB ?,? MESG DB '25+9=' DB 0,0,'$' N1 DB 9,0F0H N2 DB 25 DATA ENDS
CODE SEGMENT USE16 ASSUME CS:CODE,DS:DATA BEG: MOV AX,DATA MOV DS,AX
MOV BX,OFFSET SUM MOV AH,N1 MOV AL,N2 ADD AH,AL MOV [BX],AH CALL CHANG MOV AH,9
MOV DX,OFFSET MESG INT 21H MOV AH,4CH INT 21H
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CHANG PROC
LAST: CMP BYTE PTR [BX],10 JC NEXT
SUB BYTE PTR[BX],10 INC BYTE PTR [BX+7] MOV AH, BYTE PTR[BX] JMP LAST
NEXT: MOV DX,WORD PTR SUM ADD [BX+8],DX
ADD BYTE PTR [BX+7],30H ADD BYTE PTR [BX+8],30H RET CHANG ENDP CODE ENDS END BEG
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2.3.4从数据段NUM单元开始存有9个有符号数，并编写一个程序实现：找出最小值存放到数据段MIN单元，并将负数的个数以十进制的形式显示在屏幕上。 .486
DATA SEGMENT USE16
NUM DB -8,-44,-88,-37,2,-1,8,-26,-18 MIN DB ? AB DB '0' DATA ENDS
CODE SEGMENT USE16 ASSUME CS:CODE , DS:DATA BEG: MOV AX,DATA MOV DS,AX MOV BX,OFFSET NUM
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MOV CH,0 MOV CL,9
AGAIN: CMP BYTE PTR [BX] ,0 JG NEXT1 INC AB
CMP BYTE PTR [BX], CH JG NEXT1
MOV CH,BYTE PTR [BX] NEXT1: INC BYTE PTR BX DEC CL JNE AGAIN MOV MIN,CH MOV AH,2 MOV DL,AB INT 21H MOV AH,4CH INT 21H CODE ENDS END BEG
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.486
DATA SEGMENT USE16 BUF1 DB '123456' BUF2 DB '000000'
BUF3 DB 'Please input communication words:',0DH,0AH,'$' BUF4 DB 3
OUT1 DB 'ERRORS',0DH,0AH,'$' OUT2 DB 'RIGHT',0DH,0AH,'$' OUT3 DB '*','$' OUT4 DB 0DH,0AH,'$'
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