Add 2 numbers failed.asm

        
        
        ;add 2 numbers 
        
        
         .model small 
         .stack 100h
         .data 
         
         a db "input first digit $"
         b db "Input second digit $"
         c db "Result $"
         
         .code 
         
         main proc 
            mov ax,@data 
            mov ds,ax
            
            mov ah,9
            lea dx,a 
            int 21h
            
            mov ah,1
            int 21h
            mov bl,al
            
            mov ah,9
            lea dx,b
            int 21h
            
            mov ah,9
            lea dx,c 
            int 21h
            
            mov ah,9
            lea dx,c
            int 21h
            
            add bl,bh
            sub bl,48
            mov ah,2
            
            mov ah,2
            mov dl,bl
            int 21h
            
            exit:
            mov ah,4ch
            int 21h
            
            main endp
         end main