源代码：
dectohex segment
assume cs:dectohex
main proc far
repeat:
call dectobin
call crlf
call bintohex
call crlf
jmp repeat
main endp
dectobin proc near
mov bx,0
newchar:
mov ah,1
int 21h
sub al,30h
jl exit
cmp al,9d
jg exit
cbw
xchg ax,bx
mov cx,10d
mul cx
xchg ax,bx
add bx,ax
jmp newchar
exit:
ret
dectobin endp
bintohex proc near
mov ch,4
roate: mov cl,4
rol bx,cl
mov al,bl
and al,0fh
add al,30h
cmp al,3ah
jl printit:
add al,7h
printit:
mov dl,al
mov ah,2
int 21h
dec ch
jnz rotate
ret
bintohex endp
crlf proc near
mov dl,0dh
mov ah,2
int 21h
mov dl,0ah
mov ah,2
int 21h
ret
crlf endp
dectohex endp
end main
