汇编_十进制转二进制

;*******************************************************    
;从键盘输入一个不超过65535的正整数以回车结束输入，将这个数保存在BX中 
DEC2BIN   proc near
      
          push ax
          push cx
          push dx

          lea dx,tipD
          mov ah,9
          int 21h
          call CTLF
                        
          xor bx,bx
 newchar1:mov ah,1
          int 21h
          cmp al,0Dh
          je  ret1
          sub al,30h
          jl exit1
          cmp al,9d
          jg exit1
          cbw
          
          xchg ax,bx
          mov cx,10d
          mul cx
          xchg ax,bx
          add bx,ax 
          jmp newchar1