mov dx,offset ostr       ;22.

        mov ah,09h               ;23.输出字符串

        int 21h                  ;24.

                                 ;25.

        mov dx,offset filename   ;26.

        mov ah,0ah               ;27.接收字符串

        int 21h                  ;28.

        mov si,offset filename   ;29.

        mov di,offset tmp        ;30.

lstr:   mov dl,[si+2]            ;31.取字符

        mov [di],dl              ;32.存字符

        inc si                   ;33.地址递增

        inc di                   ;34.

        cmp dl,0dh               ;35.判断是否为回车符

        jne lstr                 ;36.不等转

                                 ;37.

        mov bl,0                 ;38.补0

        mov [di-1],bl            ;39.

        mov dx,offset tmp        ;40.取文件名

        mov cx,0                 ;41.

        mov ah,3ch               ;42.建立文件