汇编的各位朋友帮我看看下面这段程序,是清华课本上面的,但是结果总是不对~~~~
nnit 2001-10-30 05:59:24
data segment ;
source_buffer db 40 dup('a')
data ends;
extra segment;
dest_buffer db 40 dup(?)
extra ends;
code segment;
main proc far;
assume cs:code,ds:data,es:extra
start:
push ds;
sub ax,ax;
push ax;
mov ax,data;
mov ds,ax;
mov ax,extra;
mov es,ax;
lea si,source_buffer;
lea di,dest_buffer;
cld;
mov cx,40;
rep movsb;
ret;
main endp;
code ends;
end start;
上边的程序可以运行,但是和课本的结果不对,而且每次运行得到的结果不一样~~~
为什么?
debug会这样吗?