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DB 99H, 89H, 79H, 69H,75H,85H,63H,73H,83H,93H SUM DW 0 AVER DB 0

BUF DB 100 DUP (?) DATA ENDS CODE SEGMENT

ASSUME CS:CODE,DS:DATA,SS:STACK START: PUSH DS MOV AX,DATA MOV DS,AX

MOV DI, OFFSET LIST MOV BX, 19 LP0: MOV SI, DI MOV CX, BX LP1: MOV AL, [SI] INC SI

CMP AL, [SI] JNC LP2 MOV DL, [SI] MOV [SI-1], DL MOV [SI], AL LP2: LOOP LP1 DEC BX JNZ LP0 LP3: MOV CX, 20

MOV BX, OFFSET LIST MOV SUM, 0 XOR AX, AX LP4: ADD AL, [BX] DAA ADC AH, 0 INC BX LOOP LP4 MOV SUM, AX MOV BL, 20H DIV BL ADD AL,0 DAA

MOV AVER AL POP DS HLT CODE ENDS END START

17

20. ±à³Ì½«´æ·ÅÔÚALÖеÄÎÞ·ûºÅ¶þ½øÖÆÊý£¬×ª»¯³ÉÊ®Áù½øÖÆÊý£¬ÔÙת»»³ÉASIIÂë²¢ÏÔʾÔÚÆÁÄ»ÉÏ¡£ ½â£º ³ÌÐòÈçÏ£º

STACK SEGMENT STACK DB 100 DUP(?) STACK ENDS DATA SEGMENT DB 100 DUP(?) DATA ENDS CODE SEGMENT

ASSUME CS:CODE, DS:DATA, SS:STACK START: PUSH DS MOV AX, DATA MOV DS, AX MOV DH, AL MOV CH, 02H ST1: MOV CL, 4 ROR DH, CL MOV AL, DH AND AL, 0FH ADD AL, 30H CMP AL, 39H JBE DISP ADD AL, 07H DISP: MOV DL, AL MOV AH, 02H INT 21H DEC CH JNZ ST1 POP DS MOV AH, 4CH INT 21H HLT CODE ENDS END START

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STACK SEGMENT STACK BUF DB 01111000B

DB 100 DUP(?) STACK ENDS DATA SEGMENT DB 100 DUP(?)

18

DATA ENDS CODE SEGMENT

ASSUME CS:CODE, DS:DATA, SS:STACK START: PUSH DS MOV AX, DATA MOV DS, AX MOV AL, BUF MOV DH, AL MOV CH, 02H ST1: MOV CL, 4 ROR DH, CL MOV AL, DH AND AL, 0FH ADD AL, 30H CMP AL, 39H JBE DISP ADD AL, 07H DISP: MOV DL, AL MOV AH, 02H INT 21H DEC CH JNZ ST1 POP DS MOV AH, 4CH INT 21H HLT CODE ENDS END START

21. ±àд³ÌÐò£¬Ê¹ÓÃÈýÖÖÒÔÉϵķ½·¨£¬½«´æ´¢Æ÷ÖÐ2000H¿ªÊ¼µÄµØÖ·µ¥ÔªÖеÄ100×Ö½ÚÊý¾Ý¸´ÖƵ½3000H¿ªÊ¼µÄ´æ´¢Æ÷µØÖ·µ¥ÔªÖС£

½â£º

£¨1£©ÀûÓÃͨÓô«ËÍÖ¸ÁîMOV

MOV SI£¬2000H ×¢ÒâÕâÀïÈç¹ûÊDZêºÅµØÖ· £¬Ôò±ØÐëÓÃOFFSET MOV DI£¬3000H MOV CX£¬100 LP1£º MOV AL£¬[SI]

MOV [DI]£¬AL INC SI INC DI

LOOP LP1 HLT

MOV CX£¬100 MOV BX£¬0

LP0£ºMOV AL£¬2000[BX]

MOV 3000[BX]£¬AL INC BX

19

LOOP LP0 HLT

£¨2£©ÀûÓý»»»Ö¸ÁîXCHG MOV SI£¬2000H MOV DI£¬3000H MOV CX£¬100 LP2£º MOV AL£¬[SI]

XCHG [DI]£¬AL INC SI INC DI

LOOP LP2 HLT

£¨3£©ÀûÓû»ÂëÖ¸ÁîXLAT MOV BX£¬2000H MOV DI£¬3000H MOV CX£¬100

LP3£º XOR AL£¬AL

XLAT

MOV [DI], AL INC BX INC DI LOOP LP3 HLT

£¨4£©ÀûÓöÑջʵÏÖÊý¾Ý´«ËÍ MOV SI£¬2000H MOV DI£¬3000H MOV CX£¬50 LP4£º PUSH [SI]

POP [DI] INC SI INC SI INC DI INC DI

LOOP LP4 HLT

£¨5£©ÀûÓô®²Ù×÷Ö¸ÁîREP MOVSB

MOV SI£¬2000H MOV DI£¬3000H MOV CX£¬100

CLD £»DF=0£¬SI¡¢DI×Ô¶¯+1 REP MOVSB HLT µ÷ÊÔ³ÌÐò£º

STACK SEGMENT STACK DB 100 DUP(?) STACK ENDS DATA SEGMENT ORG 2000H

DB 11H,22H,33H,44H,55H.66H,77H,88H,99H DB 100 DUP(?) ORG 3000H

DB 100 DUP(?) DATA ENDS

CODE SEGMENT

ASSUME CS:CODE,DS:DATA,SS:STACK

20

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