prog6_6.asm

汇编语言-王爽 源代码 加 卜艳萍版源代码

stack  segment  stack
       db  256 dup(?)
stack  ends
code  segment
       assume  cs:code,ds:code,ss:stack
begin:push  cs
       pop  ds
       mov  ax,x
       or  ax,ax
       je  zero
       jns  plus
       mov  bl,0ffh
       jmp  exit
zero:  mov  bl,0
       jmp  exit
plus:  mov  bl,1
exit:  mov  y,bl
       mov  ah,4ch
       int  21h
       x  dw  300h
       y  db  ?
code  ends
       end  begin