.model small .STACK .DATA msg db 'input data?$' odoa db 0dh,0ah,'$' msg1 db 'the result is --> $' NO1 DB ? NO2 DB ? .CODE ; MOV AX,@DATA MOV DS,AX ; lea dx,msg mov ah,09 int 21h mov ah,01 ; input from kb int 21h sub al,30h mov no1,al lea dx,odoa mov ah,09 int 21h ; lea dx,msg mov ah,09 int 21h mov ah,01 ; input from kb int 21h sub al,30h mov no2,al lea dx,odoa mov ah,09 int 21h ; mov dl,no1 add dl,30h MOV AH,02 INT 21H ; mov dl,'+' INT 21H ; mov dl,no2 add dl,30h INT 21H ; mov dl,'=' INT 21H ; mov al,no1 add al,no2 mov dl,al add dl,30h INT 21H ; mov ah,4ch int 21h END