ass2

.model small

.data

 msg1 db 'Enter first Number $'
 msg2 db 'Enter second number $'
 msg3 db 'Sub is $'

 A db ?
 B db ?

 .code

 main proc

    ; A input

     mov ax,@data
     mov ds,ax

     lea dx,msg1
     mov ah,9
     int 21h

     mov ah,1
     int 21h

     mov A,al
     int 21h

     mov ah,2
     mov dl,0ah ;new line
     int 21h

     mov dl,0dh ;remove space
     int 21h


     ;B input


     lea dx,msg2
     mov ah,9
     int 21h

     mov ah,1
     int 21h
     mov B,al
     int 21h


     mov ah,2
     mov dl,0ah ;new line
     int 21h

     mov dl,0dh ;remove space
     int 21h


     ;print sub

     mov ah,2
     mov dl,0ah ;new line
     int 21h

     mov dl,0dh ;remove space
     int 21h

     lea dx,msg3
     mov ah,9
     int 21h

     mov bh,A
     sub bh,B
     add bh,48

     mov ah,2

     mov dl,bh
     int 21h



     main endp
 end main