I'm using emu8086, I need the following code to take negative numbers to perform the add, subtract, divide and multiply operation. Make the following code to add, subtract, divide and multiply positive and negative inputs given by the user.

org 100h

jmp start

msg: db 0dh,0ah, "==CAlCULATOR==", 0dh,0ah,0dh,0ah,"1-Addition",0dh,0ah,"2-Multiplication",0dh,0ah,"3-Subtraction",0dh,0ah,"4-Division", 0dh,0ah, msg2: db 0dh,0ah, "Enter First Number: $" msg3: db 0dh,0ah, "Enter Second Number: $" msg4: db 0dh,0ah, "Choice error $" msg5: db 0dh,0ah, "Result : $" msg6: db 0dh,0ah, 'Thank you for using this calculator...', 0dh,0ah, '$' msg7: db 0dh,0ah, 'clear(1) or Exit(0)...', 0dh,0ah,'$' msg8: db 0dh,0ah, 0dh,0ah, "Please choose An Operation: $"

start: mov ah,9 mov dx, offset msg int 21h mov ah,9 mov dx, offset msg8 int 21h mov ah,0 int 16h cmp al,31h je Addition cmp al,32h je Multiply cmp al,33h je Subtract cmp al,34h je Divide mov ah,09h mov dx, offset msg4 ;11 y 64,77 int 21h mov ah,0 int 16h jmp start

Addition: mov ah,09h mov dx, offset msg2 int 21h mov cx,0 call InputNo push dx mov ah,9 mov dx, offset msg3 int 21h mov cx,0 call InputNo pop bx add dx,bx push dx mov ah, 9 mov dx, offset msg5 int 21h mov cx,10000 pop dx call View jmp exit

InputNo: mov ah,0 int 16h mov dx,0 mov bx,1 cmp al,0dh je FormNo sub ax,30h call ViewNo mov ah,0 push ax inc cx jmp InputNo

FormNo: pop ax push dx mul bx pop dx add dx,ax mov ax,bx mov bx,10 push dx mul bx pop dx mov bx,ax dec cx cmp cx,0 jne FormNo ret

View: mov ax,dx mov dx,0 div cx call ViewNo mov bx,dx mov dx,0 mov ax,cx mov cx,10 div cx mov dx,bx mov cx,ax cmp ax,0 jne View ret

ViewNo: push ax push dx mov dx,ax add dl,30h mov ah,2 int 21h pop dx pop ax ret

exit: mov dx,offset msg7 mov ah, 09h int 21h mov ah,0 int 16h cmp al,31h mov ax,0 je start mov dx,offset msg6 mov ah, 09h int 21h ret

Multiply: mov ah,09h mov dx, offset msg2 int 21h mov cx,0 call InputNo push dx mov ah,9 mov dx, offset msg3 int 21h mov cx,0 call InputNo pop bx mov ax,dx mul bx mov dx,ax push dx mov ah,9 mov dx, offset msg5 int 21h mov cx,10000 pop dx call View jmp exit

Subtract: mov ah,09h mov dx, offset msg2 int 21h mov cx,0 call InputNo push dx mov ah,9 mov dx, offset msg3 int 21h mov cx,0 call InputNo pop bx sub bx,dx mov dx,bx push dx mov ah,9 mov dx, offset msg5 int 21h mov cx,10000 pop dx call View jmp exit

Divide: mov ah,09h mov dx, offset msg2 int 21h mov cx,0 call InputNo push dx mov ah,9 mov dx, offset msg3 int 21h mov cx,0 call InputNo pop bx mov ax,bx mov cx,dx mov dx,0 mov bx,0 div cx mov bx,dx mov dx,ax push bx push dx mov ah,9 mov dx, offset msg5 int 21h mov cx,10000 pop dx call View pop bx cmp bx,0 je exit jmp exit