汇编加法小实习

实验1    顺序程序设计

一、实习题目

两个多位十进制数相加。

二、实习目的和要求

1．  学习数据传送和算术运算指令的用法。

2．  熟悉在PC机上建立、汇编、链接、调试和运行8088/8086汇编语言程序的过程。

三、实习内容

将两个多位十进制数相加，要求被加数、加数均以ASCⅡ码形式各自顺序存放在以DATA1和DATA2为首的五个内存单元中（低位在前），结果送回DATA1处。

data segment
	DATA1 DB "2","2","3","4","5","$";
	DATA2 DB "1","9","2","1","3","$";
	DATA3 DB  "0","0","0","0","0","$";
	STR1 DB "THE RESULT IS :",0AH,"$"; 
	STR2 DB "THE FIRST NUM :",0AH,"$";  
	STR3 DB "THE SECOND NUM :",0AH,"$";

data ends
code segment
	assume cs:code,ds:data;
start:
	MOV AX,DATA;
	MOV DS,AX;
	MOV CX,5; 
	MOV DL,0;
	MOV BX,0;  
	MOV AH,09H; 提示信息
	LEA DX,STR2;
	INT 21H; STR1   
	INPUT1: ;输入第一个数
	MOV AH,01H;
	INT 21H;
	MOV DATA1[BX],AL;
	INC BX;
	LOOP INPUT1;  

	MOV AH,02H;
	MOV DL,32;
	INT 21H;  
	MOV BX,0;
	MOV CX,5;  

	MOV AH,09H; 提示信息
	LEA DX,STR3;
	INT 21H; STR1  
	INPUT2:   ;输入第二个数
	MOV AH,01H;
	INT 21H;
	MOV DATA2[BX],AL;
	INC BX;
	LOOP INPUT2;

	MOV CX,5; 
	MOV DL,0;
	MOV BX,0;
	MOV AH,02H;
	MOV DL,0AH;
	INT 21H; 
	PLUS:    

	MOV DL,DATA1[BX];  
	ADD DL,DATA2[BX];
	SUB DL,48;    
	INC BX;
	CMP DL,'9';
	JB NOUP  
	ADD DATA1[BX],1;进位
	SUB DL,10;
	NOUP:       
	MOV DATA1[BX-1],DL;
	LOOP PLUS;

	MOV AH,09H; 提示信息
	LEA DX,STR1;
	INT 21H; STR1   


	LEA DX,DATA1;
	MOV AH,09H;
	INT 21H;
	MOV AX,4C00H
	INT 21H;
	CODE ENDS
END START;