17.asm

讲数据块中的正负数分开

DATA  SEGMENT
      RAMDATA DB 1,2,3,4,5,6,7,-7,-6,-5,-4,-3,-2,-1
      COUNT EQU $-RAMDATA
      POSBUF DB COUNT DUP(0)
      NEGBUF DB COUNT DUP(0)
      POSNUM DB 0
      NEGNUM DB 0
DATA  ENDS
STACK1 SEGMENT PARA STACK
       DW 40 DUP(?)
STACK1 ENDS
CODE  SEGMENT
      ASSUME CS:CODE,DS:DATA,SS:STACK1
START:MOV AX,DATA
      MOV DS,AX
      LEA BX,RAMDATA
      MOV SI,OFFSET POSBUF
      MOV DI,OFFSET NEGBUF
      MOV CX,COUNT
LOP:MOV AL,[BX]
    TEST AL,80H
    JS NEGATIVE               ;符号位为1转NEGATIVE
    CMP AL,0
    JG POSITIVE               ;大于0转POSITIVE
    JMP GOLOP
NEGATIVE:MOV [DI],AL
         INC DI
         INC NEGNUM
         JMP GOLOP
POSITIVE:MOV [SI],AL
         INC SI
         INC POSNUM
         JMP GOLOP
GOLOP:INC BX
      DEC CX
      JNZ LOP                 ;结果不为0转LOP                 
      MOV AH,4CH
      INT 21H
CODE  ENDS
      END START