4.sum-n-so.asm

;nhap vao 1 so, tinh tong tu 1 den n

.model small
.stack 100h
.data      
    s1  db  "nhap n: $"
    s2  db  10, 13, "tong = : $"
    
.code
    main proc 
        mov ax, @data  
        mov ds, ax
        
        mov ah, 9
        lea dx, s1
        int 21h
        
        mov ah, 1
        int 21h   
        sub al, 48   ;n , doi thanh so   
       
        mov cl, 1    ; i
        mov bl, 0    ; s
    
        back:    
        add bl, cl
        inc cl   
        cmp cl, al 
        jle back   
        
        mov ah, 9
        lea dx, s2
        int 21h 
        
        ;in ra 2 so, chia 10  
        mov ah, 0 
        mov al, bl  
        mov bl, 10
        div bl
        
        mov bh, ah   
        mov bl, al
       
        mov ah, 2
        mov dl, bl
        add dl, 48
        int 21h   
        mov dl, bh
        add dl, 48
        int 21h
        
        mov ah, 4ch
        int 21h
        
        main endp
    end main