Hello, please help me with this problem

Question

.model small

.data

msg1 db 10,13,"Enter first no.$"

msg2 db 10,13,"Enter second no.$"

msg3 db 10,13,"Result is:$"

.code

start:

mov ax,@data

mov ds,ax

lea dx,msg1

mov ah,09H

int 21H

mov ah,01H

int 21H

sub al,30H

cmp al,09H

JBE L1

sub al,07H

L1: mov cl,04H

ROL al,cl

mov bl,al

mov ah,01H

int 21H

sub al,30H

cmp al,09H

JBE L2

sub al,07H

L2: ADD bl,al

lea dx,msg2

mov ah,09H

int 21H

mov ah,01H

int 21H

sub al,30H

cmp al,09H

JBE L3

sub al,07H

L3: mov cl,04H

ROL al,cl

mov bh,al

mov ah,01H

int 21H

sub al,30H

cmp al,09H

JBE L4

sub al,07H

L4: ADD bh,al

ADD bl,bh

lea dx,msg3

mov ah,09H

int 21H

mov ch,02H

mov cl,04H

L5: ROL bl,cl

mov bh,bl

AND bl,0FH

cmp bl,09H

JBE L6

ADD bl,07H

L6: ADD bl,30H

mov dl,bl

mov ah,02H

int 21H

mov bl,bh

dec ch

JNZ L5

mov ah,4ch

int 21H

sub al,0

end start

I need to rework the above code. I need to ask the user to enter the 3rd number. Then that 3rd number needs to be subtracted from the sum of the first 2 numbers.

PLEASE CAN SOMEONE HELP

Answer 1

.model small

.data

msg1 db 10,13,"Enter first no.$"

msg2 db 10,13,"Enter second no.$"

msg3 db 10,13,"Enter third no.$"

msg4 db 10,13,"Result is:$"

.code

start:

mov ax,@data

mov ds,ax

lea dx,msg1

mov ah,09H

int 21H

mov ah,01H

int 21H

sub al,30H

cmp al,09H

JBE L1

sub al,07H

L1: mov cl,04H

ROL al,cl

mov bl,al

lea dx,msg2

mov ah,09H

int 21H

mov ah,01H

int 21H

sub al,30H

cmp al,09H

JBE L2

sub al,07H

L2: ADD bl,al

lea dx,msg3

mov ah,09H

int 21H

mov ah,01H

int 21H

sub al,30H

cmp al,09H

JBE L3

sub al,07H

L3: mov cl,04H

ROL al,cl

SUB bl,al

lea dx,msg4

mov ah,09H

int 21H

mov cl,04H

ROL bl,cl

mov bh,bl

AND bl,0FH

cmp bl,09H

JBE L4

ADD bl,07H

L4: ADD bl,30H

mov dl,bl

mov ah,02H

int 21H

mov ah,4ch

int 21H

end start

Here, I added the code to receive a third number just like the first two numbers, then subtract that third number from the bl register which held the sum of the first two numbers. The message to enter the third number is saved in msg3, and the code to print and receive this number is identical to the code for the first two numbers.

Please note that if the subtraction results in a negative number, this code will not handle that case correctly. It simply performs the subtraction without checking for underflow. If you need to handle potential negative results, you will need to add additional code.