a6.asm

来自「一些微机接口的例子」· 汇编 代码 · 共 57 行

;A6.asm
;循环程序设计实验

STACK1  SEGMENT STACK
         DW 256 DUP(?)
STACK1  ENDS

DDATA	SEGMENT
NUMB	DB	12H,88H,82H,89H,33H,90H,01H,10H,0BDH,01H
MES1	DB	'The number of negative is:$'
DDATA	ENDS

CODE SEGMENT
	ASSUME CS:CODE,DS:DDATA

START: MOV	AX,DDATA
	   MOV	DS,AX

	   MOV	DI,OFFSET NUMB
	   XOR	BH,BH
	   MOV	CX,10D
A1:	   MOV 	AL,[DI]
	   TEST 	AL,80H
	   JE 	A2
	   INC BL
A2:	   INC DI
	   LOOP A1

	   MOV	DX,OFFSET MES1	   ;show mes
	   MOV	AH,09H		
	   INT 	21H	

	   MOV	AL,BL		       ;show the number of negative
	   AND	AL,0F0H		       ;get the highest 4 bits
	   SHR	AL,4
	   CMP	AL,0AH		
	   JB	C2		
	   ADD	AL,07H		
C2:	   ADD	AL,30H		
	   MOV	DL,AL		       ;show character 
	   MOV	AH,02H
	   INT	21H
	   MOV	AL,BL
	   AND	AL,0FH		       ;get the lowest 4 bits
	   CMP	AL,0AH
	   JB	C3
	   ADD 	AL,07H
C3:	   ADD	AL,30H
	   MOV	DL,AL		        ;show character 
	   MOV	AH,02H
	   INT	21H

	   MOV	AX,4C00H	        ;go back to dos
	   INT	21H
CODE  ENDS
       END START