汇编语言B试题及答案(8)

DEC SI

DEC DI

REP MOVSB

39、 XOR AX, AX

XOR DX, DX

LOP:STC

RCL AX, 1

RCL DX, 1

LOOP LOP

40、DATA SEGMENT

DB1 DB X X

DB2 DB ?

DATA ENDS

STACK1 SEGMENT PARA STACK

DB 10H DUP(0)

STACK1 ENDS

CODE SEGMENT

ASSUME CS:CODE, SS: STACK1, DS: DATA START: MOV AX, DATA

MOV DS, AX

MOV CX, 8

MOV AL, DB1

XOR AH, AH

LOP: SAL AL, 1 或SHR AL, 1

RCR AH, 1 RCL AH, 1

LOOP LOP

MOV DB2, AH

MOV AH, 4CH

INT 21H

CODE:ENDS

END START

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