99乘法表程序.txt

（1） 问题描述：在屏幕上输出ASII码表和九九乘法表。 （2） 程序应有操作提示、输入和输出

;print data
print   macro    x                
 mov    dl,x                         
 mov    ah,02h                   
 int    21h                      
 endm 
;Enter code
CR      macro                      
 print  10
 print  13
 endm
;----------------------------
data segment
 i   db   1                       
 j   db   1
data ends

code segment
main proc far
 assume cs:code,ds:data
start:  
 push ds                                  
 sub ax,ax                     
 push ax                        
 mov ax,data
 mov ds,ax
 mov cx,9
 ;---------------------------
loop_1: 
 mov j,1
loop_2:
 mov bl,j
 cmp bl,i                      
 jz  exit                      
 mov al,i
 mul bl                        
 mov bl,10
 div bl                        
 mov bx,ax
 call printCode
 call spacesub
 inc j                          
 jmp loop_2
exit:
 mov al,i
 mul bl                        
 mov bl,10
 div bl                       

 mov bx,ax
 call printCode
 call entersub
 inc i                         
 loop loop_1
 ret                           
main endp

printCode proc near            
 mov al,j
 add al,30h
 print al
 print '*'
 mov al,i
 add al,30h
 print al
 print '='
 cmp bl,0
 jz  isZero                    
 add bl,30h
 print bl
 add bh,30h
 print bh
 ret                           
 
isZero:
 print 20h                    
 add bh,30h
 print bh
 ret
printCode endp

entersub proc near            
 CR                            
 ret
entersub endp

spacesub proc near          
 print 20h                     
 ret
spacesub endp
code ends
 end start