;add two numbers(input) and show two digits
        .model small
        .stack 100h
        .data

           num1 db ?
           num2 db ?
           res db ?

        .code
               main proc

                mov ax,@data        ;prepare data segment
                mov ds,ax

       INPUT:   mov ah,01           ;input char
                int 21h
                mov num1,al
                int 21h
                mov num2,al

                mov cl,num1         ;adding and converting to decimal
                add cl,num2
                sub cl,30h
                mov res,cl

                cmp res,39h         ;if result is greater than
                jg twoDigit

                mov ah,02           ;output char
                mov dl,09h          ;tab
                int 21h
                mov dl,res
                int 21h
                jmp EXIT

     twoDigit:                     ;if result is of two digit
                 mov ah,02         ;output char
                 mov dl,09h
                 int 21h
                 mov dl,'1'
                 int 21h
                 sub res,10        ;show first digit in decimal
                 mov dl,res
                 int 21h

     EXIT:       mov ah,4ch        ;return 0
                 int 21h

         main endp
         end main