p97.asm

本程序是汇编语言的一些基本功能的组合

data segment
 tab dw p1,p2,p3,p4,p5,p6,p7,p8
 n db 8
data ends
stack segment stack
 db 200 dup(0)
stack ends
code segment
 assume ds:data,ss:stack,cs:code
start:
 mov ax,data
 mov ds,ax
 mov al,n;(al)=5
 dec al  ;(al)=4
 add al,al ;(al)=8
 mov bl,al ;(bl)=8
 mov bh,0  ;(bx)=8
 jmp tab[bx] 
p1:
 mov ah,2
 mov dl,'1'
 int 21h
 jmp exit
p2:
 mov ah,2
 mov dl,'2'
 int 21h
 jmp exit
p3:
 mov ah,2
 mov dl,'3'
 int 21h
 jmp exit
p4:
 mov ah,2
 mov dl,'4'
 int 21h
 jmp exit
p5:
 mov ah,2
 mov dl,'5'
 int 21h
 jmp exit
p6:
 mov ah,2
 mov dl,'6'
 int 21h
 jmp exit
p7:
 mov ah,2
 mov dl,'7'
 int 21h
 jmp exit
p8:
 mov ah,2
 mov dl,'8'
 int 21h
exit:
 mov ah,4cH
 int 21h
code ends
 end start