2.Multiplication Table.arm

DATAS SEGMENT
     
    MESSAGE    DB "PLEASE INPUT A NUMBER:",0AH,0DH,'$'
    MESSAGE2    DB "error!!!",0AH,0DH,'$'
    A DB 1
    B DB ?
    N DB ?
    RESULT DB ?
    ;此处输入数据段代码 
DATAS ENDS

STACKS SEGMENT
    ;此处输入堆栈段代码
STACKS ENDS

CODES SEGMENT
    ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
    MOV AX,DATAS
    MOV DS,AX
    
    MOV DX,OFFSET MESSAGE   ;输入提示
    MOV AH,09
    INT 21H           
   
    MOV AH,1      
    INT 21H       
    MOV RESULT,AL
    
    CMP AL,30H
    JB  ERROR
    CMP AL,3AH
    JA  ERROR
    
    
    MOV AL,RESULT
    SUB AL,30h    
    MOV N,AL      
    INT 21H  
    
l1:
    MOV AL,A
    MOV CL,AL     ;控制
    MOV B,1       ;从1开始

lop:
    ADD B,30h     ;将数字转成字符
    MOV DL,B     
    MOV AH,2      
    INT 21H       
    
    MOV DL,'*'
    MOV AH,2 
    INT 21H       
   
    ADD A,30h
    MOV DL,A    
    MOV AH,2      
    INT 21H       
    
    MOV DL,'='
    MOV AH,2 
    INT 21H       
    
    SUB A,30h     
    SUB B,30h     
    MOV AL,A      
    MOV BL,B      
    MUL BL        ;积:AL
    
    MOV BL,10        
    DIV BL        ;商：AL 余数：AH
    
    MOV BH,AL     ;商
    MOV BL,AH     ;余数
    ADD BX,3030h  ;分别将AL,AH转化成数字
    
    CMP BH,30h    ;判断商是否为0
    JE l2         ;相等跳转
    
    MOV DL,BH     ;输出商
    MOV AH,2
    INT 21H

l2:
    MOV DL,BL     ;输出余数
    MOV AH,2
    INT 21H
    
    MOV DL,' '
    MOV AH,2
    INT 21H
    
    INC B         
    
    LOOP lop
    
    MOV DL,0AH    ;回车
    MOV AH,2
    INT 21H
    
    INC A
    MOV AL,N 
    CMP A,AL      ;判断是否到达输入的数
    JBE l1        ;行数<=输入数
    JMP EXIT
    
ERROR:
    INT 21H 
    MOV DX,OFFSET MESSAGE2   ;输入提示
    MOV AH,09
    INT 21H    
        
    ;此处输入代码段代码
EXIT:    MOV AH,4CH
    INT 21H
CODES ENDS
    END START