汇编语言（五）实验7 寻址方式在结构化数据访问中的应用

assume cs:code,ds:data
data segment
   db '1975','1976','1977','1978','1979','1980','1981','1982','1983'
   db '1984','1985','1986','1987','1988','1989','1990','1991','1992'
   db '1993','1994','1995'

   dd 16,22,382,1356,2390,8000,16000,24486,50065,97479,140417,197514
   dd 345980,590827,803530,1183000,1843000,2759000,3753000,4649000,5937000

   dw 3,7,9,13,28,38,130,220,476,778,1001,1442,2258,2793,4037,5635,8226
   dw 11542,14430,15257,17800
data ends

table segment
   db 21 dup('year summ ne ?? ')
table ends

code segment
start:
     mov ax,data
     mov ds,ax
     mov ax,table
     mov es,ax
     mov bx,0
     mov bp,0
     mov cx,21
     mov ax,0

l:   push cx

     mov si,0
     mov cx,4
a:
     mov dl,[bx][si]
     mov es:[bp][si],dl  ;使用bp 默认段寄存器为ss，所以须指定为es
     inc si
     loop a
;     mov es:[bp].0[si],byte ptr ' '

     mov si,0
     mov cx,2
b:
     mov dx,[bx].84[si]
     mov es:[bp].5[si],dx
     push dx	;保存dx用于后面除法计算
     inc si
     inc si
     loop b
;     mov es:[bp].5[si],byte ptr ' '

     mov si,0
     push bx      ;对bx判断，前两项数据每个都是双字型，在定位时+4 正确，而第三项数据为字型，需处理
     cmp bx,0
     ja s 
     
c:
     mov dx,[bx].168[si]
     mov es:[bp].10[si],dx
     
     inc si
     inc si
;     mov es:[bp].10[si],byte ptr ' '

     mov di,dx  ;将dx值给di用于除法计算
     pop bx
     pop dx    ;div默认使用dx存放被除数的高8位，ax存放被除数的低8位
     mov ds:[210],ax  ;保存ax
     pop ax
     div di  
     mov es:[bp].0dh,ax  
     mov ax,ds:[210]  ;恢复ax

     pop cx

     add bp,16   ;定位下一行table
     add bx,4    ;定位下一项数据
     loop l
     jmp v
s:
     
     inc al
     push ax  ;保存al值，防止在乘法运算中被修改
     mov ah,2
     mul ah
     sub bx,ax
     pop ax
     jmp c

v:   mov ah,4ch
     int 21h
code ends
     end start