Double input & Double output in Assembly

include "emu8086.inc"
.model small
.stack 100h
.code
main proc
    dig1 db ?
    dig2 db ?
    num1 db ?
    num2 db ?


    mov ah,1
    int 21h
    sub al,30h
    mov dig1,al
    int 21h
    sub al,30h
    mov dig2,al

    mov al,dig1
    mov bl,10
    mul bl

    add al,dig2
    mov num1,al

    printn
    mov ah,1
    int 21h
    sub al,30h
    mov dig1,al
    int 21h
    sub al,30h
    mov dig2,al

    mov al,dig1
    mul bl

    add al,dig2
    mov num2,al

    add al,num1

    mov ah,0
    div bl
    mov bx,ax
    add bh,30h
    add bl,30h

    printn
    mov ah,2
    mov dl,bl
    int 21h
    mov dl,bh
    int 21h