data segment
result dw ?
data ends

code segment
assume CS:code,DS:data
start:

MOV AH,01h
int 21h
xor DL,DL
mov DL,AH
mov AH,01H
INT 21H
add ah,dL
mov ah,09h
int 21h
MOV AH,4ch
int 21h

code ends
end start
键盘上输入两个数相加｀｀　帮看下｀｀