data segment
    x           db      1
    y           db      2
    sum      db      ?
    string    db      "The result of x+y=$"
data ends
code segment
     assume cs:code,ds:data
start:     
     mov ax,data
     mov ds,ax
     mov dx,offset string
     mov ah,09h
     int 21h
     mov al,x
     add al,y
     mov sum,al
     add al,30h
     mov dl,al
     mov ah,02h
     int 21h
     mov ah,4ch
     int 21h
code ends
     end start