Question

;the task is to print out the result no matter how many digits 
; it should work on Emu8086
;the code should be in assembly language 
; add comments to your code



org 100h

.data

F db 0
num1 db 0
num2 db 0
op db 0
result db 0
msg db 0dh,0ah,"Error"


.code
mov ax,@data
mov ds,ax


LL1:
call get1 
cmp ax,0
je print
cmp F,0
je LL1  

LL2:
call get2 
cmp ax,0
je print
cmp F,1
je LL2


Solve: 

cmp op,'+'
je addition
mov bl, num1
sub bl,num2
mov result,bl
jmp printresult
addition:
mov bl, num1
add bl,num2
mov result,bl

printresult:

;Task: add code to print result

jmp done




print:

mov cx,7
mov si,0
screen:
mov dl,msg[si]
mov ah,2
int 21h
inc si
loop screen


done:
ret


get1 proc
     
    mov ah,1
    int 21h
        
    cmp al,'+'
    je L4 
    cmp al,'-'
    je L5
    
    sub al,30h
    
    cmp al,0
    jb L2
    cmp al,9
    ja L2
    
    mov cx,10
    mov bh,0
    L3:
    add bh,num1
    loop L3
    add bh,al
    mov num1,bh
    ret 
    
    L4:
    mov op,'+'
    mov F,1
    ret
    L5:
    mov op,'-'
    mov F,1
    ret
    L2:
    mov ax,0
       
    ret
    endp

get2 proc
     
    mov ah,1
    int 21h
        
    cmp al,'='
    je L41 
    
    
    sub al,30h
    
    cmp al,0
    jb L21
    cmp al,9
    ja L21
    
    mov cx,10
    mov bh,0
    L31:
    add bh,num2
    loop L31
    add bh,al
    mov num2,bh
    ret 
    
    L41:
    mov F,2
    ret
    
    L21:
    mov ax,0
       
    ret
    endp

Answer 1

Greetings!!

• Only the code for display is added

Code:

.DATA

RES DB 4 DUP(?) ;array to store the decimal result

printresult:
LEA SI,RES ;load the address of result array
ADD SI,2 ;increments the array index by 2 to access the array from last to first
PUSH AX ;saves the previous answers on to the stack
PUSH CX
PUSH DX
  
MOV CL,10 ;load 10 to CL for converting the answer to decimal
MOV AL,BL ;copy the answer into register AL
AGAIN:
MOV AH,0 ;clear AH
DIV CL ;divide the answer with 10 and store the remainder(is the equivalent decinal) into the result array
ADD AH,30H ;add 30H to convert into ASCII
MOV [SI],AH ;store the decimal digit into the array
DEC SI ;decrement array index
CMP AL,0 ;check the convetion is over or not
JZ END ;if finished go to the label END
JMP AGAIN ;otherwise repeat the division process to convert the answer to decimal
END:
LEA SI,RES
MOV [SI+3],'$' ;insert end of string character at the end of the result array
  
MOV DX,OFFSET RES ;display the answer stored in the result array
MOV AH,9
INT 21H
  
POP DX ;reload the registers
POP CX
POP AX

jmp done

Output screenshots:

Hope this helps