Question

汇编语言怎样将一个含有20个有符号的数组arrayM分成正负两组数据

Answer 1

DATA SEGMENT
arrayM DB 03H，46H，0F4H，0AFH，0AH，90H，87H，50H
DB 99H，0FFH，30H，77H，15H，53H，0B3H，9EH
COUNT EQU $-arrayM ；数据块的长度
PLUBUF DB 20 DUP（？）；放正数
MINBUF DB 20 DUP（？）；放负数
DATA ENDS
CODE SEGMENT
ASSUME CS：CODE，DS:DATA
START: MOV AX,DATA
MOV DS,AX
MOV SI,OFFSET arrayM
MOV DI,OFFSET PLUBUF
MOV BX,OFFSET MINBUF
MOV CX,COUNT
CLD
AGAIN: LODSB
TEST AL,80H
JNZ MINUS
STOSB
JMP NEXT
MINUS: XCHG BX,DI
STOSB
XCHG BX,DI
NEXT: LOOP AGAIN
MOV AH,4CH
INT 21H
CODE ENDS
END START