DO NOT ANSWER IF NOT EXPERT ON ASSEMBLY LABGUAGE PROGRAMMING X86 DOSBox-X This is assembly language code, it has no warning or errors but doesn't run as expected. This program asks the user for 2 numbers that are only from 0 to 9. Then should print all the results from the operations which are add, subtract, divide and multiply these 2 numbers. Please fix. Here is the code: .model small .stack 100h .data prompt1 db 10,13,'Enter first digit: $' prompt2 db 10,13,'Enter second digit: $' result dw ? error_message db 'Invalid input, enter a digit between 0 and 9: $' divide_by_zero_message db 'Cannot divide by 0, enter a non-zero second digit: $' .code main proc mov ax, @data mov ds, ax call GET_FIRST_DIGIT call GET_SECOND_DIGIT ; Check if the second digit is 0 cmp dx, 0 je DIVIDE_BY_ZERO ; Automatically perform all four arithmetic operations mov bx, ax mov cx, dx ; Addition add ax, cx mov result, ax call SHOW_RESULT ; Subtraction mov ax, bx sub ax, cx mov result, ax call SHOW_RESULT ; Multiplication mov ax, bx mul cx mov result, ax call SHOW_RESULT ; Division mov ax, bx div cx mov result, ax call SHOW_RESULT jmp END_PROGRAM DIVIDE_BY_ZERO: ; Display an error message lea dx, divide_by_zero_message call DISPLAY_PROMPT END_PROGRAM: ret main endp ; get the first digit GET_FIRST_DIGIT proc ; display the prompt lea dx, prompt1 call DISPLAY_PROMPT ; get the digit call GET_DIGIT ret GET_FIRST_DIGIT endp ; get the second digit GET_SECOND_DIGIT proc ; display the prompt lea dx, prompt2 call DISPLAY_PROMPT ; get the digit call GET_DIGIT ret GET_SECOND_DIGIT endp ; display the result SHOW_RESULT proc ; display the result mov dx, result mov ax, result call DISPLAY_NUMBER ret SHOW_RESULT endp ; display a prompt DISPLAY_PROMPT proc ; display the prompt mov ah, 9 int 21h ret DISPLAY_PROMPT endp ; get a digit GET_DIGIT proc ; get the digit call GET_CHAR sub al, 48 cmp al, 0 jge VALID_DIGIT cmp al, 9 jl VALID_DIGIT ; display an error message ERROR: lea dx, error_message call DISPLAY_PROMPT jmp GET_DIGIT VALID_DIGIT: mov ah, 0 ret GET_DIGIT endp GET_CHAR proc ; get the character mov ah, 1 int 21h cmp al, 13 je EXIT_GET_CHAR cmp al, 10 je EXIT_GET_CHAR jmp GET_CHAR EXIT_GET_CHAR: ret GET_CHAR endp DISPLAY_DIGIT PROC mov ah, 2 int 21h ret DISPLAY_DIGIT ENDP ; display a number DISPLAY_NUMBER proc ; get the number of digits in the result mov cx, result cmp cx, 0 je DISPLAY_ZERO mov bx, 10 xor dx, dx mov bp, 0 div bx inc bp cmp dx, 0 jne @F @B: ; get the current digit mov dx, cx mov ax, 10 mul bp div ax add dl, 48 ; display the digit call DISPLAY_DIGIT ; prepare for next digit dec bp mov cx, ax cmp ax, 0 jne @B jmp @E @F: inc bp jmp @B @E: ret DISPLAY_ZERO: mov dl, 48 call DISPLAY_DIGIT ret DISPLAY_NUMBER endp END main This is the output of the program: C:\>cd final C:\FINAL>final.exe Enter first digit: 2 Enter second digit: 3 00 .

1. DO NOT ANSWER IF NOT EXPERT ON ASSEMBLY LABGUAGE PROGRAMMING X86
DOSBox-X
This is assembly language code, it has no warning or errors but doesn't run as expected. This
program asks the user for 2 numbers that are only from 0 to 9. Then should print all the results
from the operations which are add, subtract, divide and multiply these 2 numbers. Please fix.
Here is the code:
.model small
.stack 100h
.data
prompt1 db 10,13,'Enter first digit: $'
prompt2 db 10,13,'Enter second digit: $'
result dw ?
error_message db 'Invalid input, enter a digit between 0 and 9: $'
divide_by_zero_message db 'Cannot divide by 0, enter a non-zero second digit: $'
.code
main proc
mov ax, @data
mov ds, ax
call GET_FIRST_DIGIT
call GET_SECOND_DIGIT
; Check if the second digit is 0
cmp dx, 0
je DIVIDE_BY_ZERO
; Automatically perform all four arithmetic operations
mov bx, ax
mov cx, dx
; Addition
add ax, cx
mov result, ax
call SHOW_RESULT
; Subtraction
mov ax, bx
sub ax, cx
mov result, ax
call SHOW_RESULT

2. ; Multiplication
mov ax, bx
mul cx
mov result, ax
call SHOW_RESULT
; Division
mov ax, bx
div cx
mov result, ax
call SHOW_RESULT
jmp END_PROGRAM
DIVIDE_BY_ZERO:
; Display an error message
lea dx, divide_by_zero_message
call DISPLAY_PROMPT
END_PROGRAM:
ret
main endp
; get the first digit
GET_FIRST_DIGIT proc
; display the prompt
lea dx, prompt1
call DISPLAY_PROMPT
; get the digit
call GET_DIGIT
ret
GET_FIRST_DIGIT endp
; get the second digit
GET_SECOND_DIGIT proc
; display the prompt
lea dx, prompt2
call DISPLAY_PROMPT
; get the digit
call GET_DIGIT
ret
GET_SECOND_DIGIT endp

3. ; display the result
SHOW_RESULT proc
; display the result
mov dx, result
mov ax, result
call DISPLAY_NUMBER
ret
SHOW_RESULT endp
; display a prompt
DISPLAY_PROMPT proc
; display the prompt
mov ah, 9
int 21h
ret
DISPLAY_PROMPT endp
; get a digit
GET_DIGIT proc
; get the digit
call GET_CHAR
sub al, 48
cmp al, 0
jge VALID_DIGIT
cmp al, 9
jl VALID_DIGIT
; display an error message
ERROR:
lea dx, error_message
call DISPLAY_PROMPT
jmp GET_DIGIT
VALID_DIGIT:
mov ah, 0
ret
GET_DIGIT endp
GET_CHAR proc
; get the character
mov ah, 1
int 21h
cmp al, 13
je EXIT_GET_CHAR
cmp al, 10

4. je EXIT_GET_CHAR
jmp GET_CHAR
EXIT_GET_CHAR:
ret
GET_CHAR endp
DISPLAY_DIGIT PROC
mov ah, 2
int 21h
ret
DISPLAY_DIGIT ENDP
; display a number
DISPLAY_NUMBER proc
; get the number of digits in the result
mov cx, result
cmp cx, 0
je DISPLAY_ZERO
mov bx, 10
xor dx, dx
mov bp, 0
div bx
inc bp
cmp dx, 0
jne @F
@B:
; get the current digit
mov dx, cx
mov ax, 10
mul bp
div ax
add dl, 48
; display the digit
call DISPLAY_DIGIT
; prepare for next digit
dec bp
mov cx, ax
cmp ax, 0
jne @B
jmp @E

5. @F:
inc bp
jmp @B
@E:
ret
DISPLAY_ZERO:
mov dl, 48
call DISPLAY_DIGIT
ret
DISPLAY_NUMBER endp
END main
This is the output of the program:
C:>cd final
C:FINAL>final.exe
Enter first digit: 2
Enter second digit: 3
00