1.dup是一个操作符,在汇编语言中,同db,dd,dw等一样,
db 3 dup(0)
含义: 定义了 3个字节,他们的值都是0,相当于db 0,0,0
db 3 dup (0,1,2)
定义了9个字节,他们是0,1,2,0,1,2,0,1,2
2.例子---实验室7
将data 数据段中的数据写入到table中
程序:
assume cs:code ,ds:data ,es:table
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 16,22,382,1356,2390,8000,16000,24486,50065,97479,140147,197514
dd 345890,590827,865858,1189000,2759000,3753000,4649000,5937000
dw 3,7,9,28,38,130,220,476,778,1001,1442,2258,2793,4037,5635,8226
dw 11542,14430,15257,17800
data ends
table segment
db 21 dup ('year summ ne ??')
table ends
code segment
start:
mov ax,table
mov ds,ax
mov ax,data
mov es,ax
mov di,0
mov si,0
mov bx,0
mov cx,21
s:
mov ax,es:[di]
mov ds:[bx+0],ax
mov ax,es:[di+2]
mov ds:[bx+2],ax
mov ax,es:[54h+di]
mov ds:[bx+5h],ax
mov ax,es:[56h+di]
mov ds:[bx+7h],ax
mov ax,es:[0A8h+si]
mov ds:[bx+0Ah],ax
mov ax,ds:[bx+5h]
mov dx,ds:[bx+7h]
div word ptr ds:[bx+0Ah]
mov ds:[bx+0Dh],ax
add bx,10h
add si,2
add di,4
loop s
mov ax,4c00h
int 21h
code ends
end start
mov ax,4c00H
int 21H
code ends
end
结果:
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