Something wrong with my assembly code for movie ticketing system

I have written the code for a movie ticketing system, and I have only implemented it for Action Movie 1 to test its functionality. When I run the code, everything goes well until I enter the quantity. At that point, it displays weird symbols until the payment part. How should I address this? I used emu8086 to run the code.

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<code>.MODEL SMALL
.STACK 100h
.DATA
; for login
username db "testing$" ;set username
password db "1234$" ; set password
welcome_msg db 10,13,"Welcome to City Cineplex Ticketing System!$"
enterName_msg db 10,13,"Please enter your username: $"
enterPwd_msg db 10,13,"Please enter your password: $"
wrong_msg db 10,13,"Invalid username or password. Please try again.$"
correct_msg db 10,13,"Login successful!$"
categories_msg db 10,13,"Please choose a category (1-5): $"
category1 db 10,13,"1. Action$"
category2 db 10,13,"2. Comedy$"
category3 db 10,13,"3. Drama$"
category4 db 10,13,"4. Sci-Fi$"
category5 db 10,13,"5. Horror$"
movies_msg db 10,13,"Please choose a movie(1-5): $"
action_movie1 db 10,13,10,13,"1. Avengers: Startgame - 2hrs 30mins RM15$"
action_movie2 db 10,13,"2. Mission possible - 2hrs 15mins RM13$"
action_movie3 db 10,13,"3. Slow & Calm 100 - 2hrs 20mins RM14$"
action_movie4 db 10,13,"4. John Wick: Chapter 30 - 2hrs 10mins RM12$"
action_movie5 db 10,13,"5. White Panther - 2hrs 15mins RM13$"
comedy_movie1 db 10,13,"1. The Sober - 1hr 45mins RM11$"
comedy_movie2 db 10,13,"2. SuperGood - 1hr 55mins RM12$"
comedy_movie3 db 10,13,"3. Livepool - 2hrs 5mins RM13$"
comedy_movie4 db 10,13,"4. 21 Walk Street - 1hr 50mins RM11$"
comedy_movie5 db 10,13,"5. Teddy - 1hr 45mins RM10$"
drama_movie1 db 10,13,"1. The Shawshank Redemption - 2hrs 22mins RM14$"
drama_movie2 db 10,13,"2. Schindler's List - 3hrs 15mins RM15$"
drama_movie3 db 10,13,"3. Forest Gump - 2hrs 22mins RM14$"
drama_movie4 db 10,13,"4. The Godfather - 2hrs 55mins RM16$"
drama_movie5 db 10,13,"5. The Red Mile - 3hrs 9mins RM15$"
scifi_movie1 db 10,13,"1. Inception - 2hrs 28mins RM15$"
scifi_movie2 db 10,13,"2. Blade Runner 2049 - 2hrs 44mins RM17$"
scifi_movie3 db 10,13,"3. The Matrix - 2hrs 16mins RM14$"
scifi_movie4 db 10,13,"4. Interstellar - 2hrs 49mins RM16$"
scifi_movie5 db 10,13,"5. Moon Wars - 2hrs 1min RM13$"
horror_movie1 db 10,13,"1. The Spiritual Healer - 2hrs 2mins RM12$"
horror_movie2 db 10,13,"2. The Gleaming - 2hrs 26mins RM14$"
horror_movie3 db 10,13,"3. Psychopath - 1hr 49mins RM11$"
horror_movie4 db 10,13,"4. The Summoning - 1hr 52mins RM11$"
horror_movie5 db 10,13,"5. A Daymare on Elm Street - 1 hr 31mins RM10$"
action1_prices db 15
action2_prices db 13
action3_prices db 14
action4_prices db 12
action5_prices db 13
comedy1_prices db 11
comedy2_prices db 12
comedy3_prices db 13
comedy4_prices db 11
comedy5_prices db 10
drama1_prices db 14
drama2_prices db 15
drama3_prices db 14
drama4_prices db 16
drama5_prices db 15
scifi1_prices db 15
scifi2_prices db 17
scifi3_prices db 14
scifi4_prices db 16
scifi5_prices db 13
horror1_prices db 12
horror2_prices db 14
horror3_prices db 11
horror4_prices db 11
horror5_prices db 10
prompt_msg db 10,13,"Enter your choice (1-5): $"
invalid_msg db 10,13,"Invalid choice. Please try again.$"
quantity_msg db 10,13,"Enter the quantity: $"
proceed_msg db 10,13,"Proceed to payment? (Y for Yes/N for No): $"
payment_success_msg db 10,13,"Payment successful!$"
payment_fail_msg db 10,13,"Payment failed. Please try again.$"
menu_msg db 10,13,"Do you want to buy another ticket? (Y/N): $"
goodbye_msg db 10,13,"Thank you for using City Cineplex Ticketing System. Enjoy your movie!$"
beforetax_msg db 10,13,"This is your price before tax: $"
TAX_RATE equ 105
username_buffer db 20, ?
password_buffer db 20, ?
category_selection db ?
movie_selection db ?
quantity db ?
price_before_tax db ?
payment_confirmation db ?
price_after_tax db ?
.CODE
MAIN PROC
MOV AX, @data
MOV DS, AX
; Display welcome message
MOV AH, 09h
LEA DX, welcome_msg
INT 21h
login_prompt:
; Display message asking for username
MOV AH, 09h
LEA DX, enterName_msg
INT 21h
; Read username input
MOV AH, 0Ah
MOV DX, OFFSET username_buffer
INT 21h
; Display message asking for password
MOV AH, 09h
LEA DX, enterPwd_msg
INT 21h
; Read password input
MOV AH, 0Ah
MOV DX, OFFSET password_buffer
INT 21h
; Check if username and password are correct
MOV SI, OFFSET username
MOV DI, OFFSET username_buffer + 2
MOV CX, 7 ; Length of username
CALL compare_strings ; Compare strings
JC login_error ; If not equal, jump to error
MOV SI, OFFSET password
MOV DI, OFFSET password_buffer + 2
MOV CX, 5 ; Length of password
CALL compare_strings ; Compare strings
JC login_error ; If not equal, jump to error
; Username and password are correct, proceed to main menu
MOV AH, 09h
LEA DX, correct_msg
INT 21h
JMP MAIN_MENU
compare_strings:
; Compare strings
@@compare_loop:
LODSB ; Load byte from SI into AL, increment SI
MOV BL, [DI] ; Load byte from DI into BL
CMP AL, BL ; Compare bytes
JNE @@not_equal ; If not equal, jump to not_equal
TEST AL, AL ; Check for end of string
JZ @@equal ; If end of string, strings are equal
INC DI ; Increment DI
LOOP @@compare_loop ; Repeat loop
@@not_equal:
RET ; Return with carry flag set
@@equal:
CLC ; Clear carry flag
RET ; Return
login_error:
; Display error message
MOV AH, 09h
LEA DX, wrong_msg
INT 21h
JMP login_prompt ; Loop back to login prompt
MAIN_MENU:
; Display categories
MOV AH, 09h
LEA DX, category1
INT 21h
LEA DX, category2
INT 21h
LEA DX, category3
INT 21h
LEA DX, category4
INT 21h
LEA DX, category5
INT 21h
; Read category selection
MOV AH, 09h
LEA DX, categories_msg
INT 21h
MOV AH, 01h
INT 21h
SUB AL, '0' ; Convert ASCII to number
CMP AL, 1
JB invalid_category_selection
CMP AL, 5
JA invalid_category_selection
MOV category_selection, AL
; Display movies for the selected category
MOV AH, 09h
CMP category_selection, 1
JE display_action_movies
CMP category_selection, 2
JE display_comedy_movies
CMP category_selection, 3
JE display_drama_movies
CMP category_selection, 4
JE display_scifi_movies
CMP category_selection, 5
JE display_horror_movies
JMP invalid_category_selection
display_action_movies:
MOV AH, 09h
LEA DX, action_movie1
INT 21h
LEA DX, action_movie2
INT 21h
LEA DX, action_movie3
INT 21h
LEA DX, action_movie4
INT 21h
LEA DX, action_movie5
INT 21h
JMP SELECT_ACTION
display_comedy_movies:
MOV AH, 09h
LEA DX, comedy_movie1
INT 21h
LEA DX, comedy_movie2
INT 21h
LEA DX, comedy_movie3
INT 21h
LEA DX, comedy_movie4
INT 21h
LEA DX, comedy_movie5
INT 21h
;JMP SELECT_COMEDY
display_drama_movies:
MOV AH, 09h
LEA DX, drama_movie1
INT 21h
LEA DX, drama_movie2
INT 21h
LEA DX, drama_movie3
INT 21h
LEA DX, drama_movie4
INT 21h
LEA DX, drama_movie5
INT 21h
;JMP SELECT_DRAMA
display_scifi_movies:
MOV AH, 09h
LEA DX, scifi_movie1
INT 21h
LEA DX, scifi_movie2
INT 21h
LEA DX, scifi_movie3
INT 21h
LEA DX, scifi_movie4
INT 21h
LEA DX, scifi_movie5
INT 21h
;JMP SELECT_SCIFI
display_horror_movies:
MOV AH, 09h
LEA DX, horror_movie1
INT 21h
LEA DX, horror_movie2
INT 21h
LEA DX, horror_movie3
INT 21h
LEA DX, horror_movie4
INT 21h
LEA DX, horror_movie5
INT 21h
;JMP SELECT_HORROR
invalid_category_selection:
; Display error message
MOV AH, 09h
LEA DX, invalid_msg
INT 21h
JMP MAIN_MENU ; Loop back to main menu
SELECT_ACTION:
MOV AH,09h
LEA DX,movies_msg
INT 21h
MOV AH,01h
INT 21h
SUB AL, '0'
CMP AL,1
JB invalid_action_selection
CMP AL,5
JA invalid_action_selection
MOV movie_selection, AL
MOV AH,09h
CMP movie_selection, 1
JE action1
; CMP movie_selection, 2
;JE action2
; CMP movie_selection, 3
;JE action3
; CMP movie_selection, 4
;JE action4
; CMP movie_selection, 5
; JE action5
JMP invalid_category_selection
action1:
; Display prompt for quantity
MOV AH, 09h
LEA DX, quantity_msg
INT 21h
; Read quantity input
MOV AH, 01h
INT 21h
SUB AL, '0' ; Convert ASCII to number
MOV quantity, AL
; Multiply action1_prices with quantity
INDEC3 PROC ;INDEC3 IS FOR TAKING INPUT FOR MULTIPLY WITH THE GIVEN AMOUNT
PUSH BX ;TAKE VALUES INTO STACK
PUSH CX
PUSH DX
XOR BX,BX ;HOLDS TOTAL
XOR CX,CX ;SIGN
MOV AH,1 ;TAKE CHARACTER IN AL
INT 21H
REPEAT4:
CMP AL,48 ;IF AL<0, PRINT ERROR MESSAGE
JL invalid_action_selection
CMP AL,57 ;IF AL>9, PRINT ERRIR MESSAGE
JG invalid_action_selection
AND AX,00FH ;CONVERT TO DIGIT
PUSH AX ;SAVE ON STACK
MOV AX,10 ;GET 10
MUL BX ;AX=TOTAL * 10
POP BX ;GET DIGIT BACK
ADD BX,AX ;TOTAL = TOTAL X 10 +DIGIT
MOV AH,1
INT 21H
CMP AL,0DH ;CARRIAGE RETURN
JNE REPEAT4 ;IF NO CARRIEGE RETURN THEN MOVE ON
MOV AX,BX ;STORE IN AX
;AND RETURN
; Display price before tax
MOV AH, 09h
LEA DX, beforetax_msg
INT 21h
; Display the calculated price
MOV AH, 09h
LEA DX, price_before_tax
INT 21h
; Continue with payment confirmation
JMP PAYCONFIRMATION
invalid_action_selection:
; Display error message
MOV AH, 09h
LEA DX, invalid_msg
INT 21h
JMP display_action_movies ; Loop back selection of action movies
PAYCONFIRMATION:
; Display payment confirmation message
MOV AH, 09h
LEA DX, proceed_msg
INT 21h
; Read payment confirmation
MOV AH, 01h
INT 21h
CMP AL, 'Y'
JNE not_proceed_payment
; Calculate price after tax
MOV Ah, price_before_tax
MOV Bh, TAX_RATE
MUL Bh
MOV Bh, 100
DIV BH
MOV price_after_tax, AL
; Display price after tax
MOV AH, 09h ; Display function
MOV DL, '$'
INT 21h
MOV AH, price_after_tax
; Display payment success message
MOV AH, 09h
LEA DX, payment_success_msg
INT 21h
; Prompt for another ticket purchase
MOV AH, 09h
LEA DX, menu_msg
INT 21h
; Read menu choice
MOV AH, 01h
INT 21h
CMP AL, 'Y'
JNE exit_program
; Loop back to main menu
JMP MAIN_MENU
not_proceed_payment:
; Display goodbye message and exit
MOV AH, 09h
LEA DX, goodbye_msg
INT 21h
JMP exit_program
exit_program:
; Exit program
MOV AH, 4Ch
INT 21h
ascii_to_num:
XOR AL, AL ; Clear AL to store result
@@convert_loop:
MOV AH, 0 ; Clear AH for DIV operation
LODSB ; Load character into AL, increment SI
CMP AL, 0DH ; Check for Enter key
JE @@done ; If Enter, done converting
SUB AL, '0' ; Convert ASCII character to numerical value
CMP AL, 0 ; Check for valid digit (0-9)
JB @@error ; If not a valid digit, exit with AL = 0
CMP AL, 9 ; Check if digit is greater than 9
JA @@error
; Multiply AL by 10 and add the current digit
MOV BL, 10
MUL BL
ADD AL, AH
JMP @@convert_loop
@@error:
XOR AL, AL ; Set AL = 0 to indicate error
RET
@@done:
RET
END MAIN
</code>
<code>.MODEL SMALL .STACK 100h .DATA ; for login username db "testing$" ;set username password db "1234$" ; set password welcome_msg db 10,13,"Welcome to City Cineplex Ticketing System!$" enterName_msg db 10,13,"Please enter your username: $" enterPwd_msg db 10,13,"Please enter your password: $" wrong_msg db 10,13,"Invalid username or password. Please try again.$" correct_msg db 10,13,"Login successful!$" categories_msg db 10,13,"Please choose a category (1-5): $" category1 db 10,13,"1. Action$" category2 db 10,13,"2. Comedy$" category3 db 10,13,"3. Drama$" category4 db 10,13,"4. Sci-Fi$" category5 db 10,13,"5. Horror$" movies_msg db 10,13,"Please choose a movie(1-5): $" action_movie1 db 10,13,10,13,"1. Avengers: Startgame - 2hrs 30mins RM15$" action_movie2 db 10,13,"2. Mission possible - 2hrs 15mins RM13$" action_movie3 db 10,13,"3. Slow & Calm 100 - 2hrs 20mins RM14$" action_movie4 db 10,13,"4. John Wick: Chapter 30 - 2hrs 10mins RM12$" action_movie5 db 10,13,"5. White Panther - 2hrs 15mins RM13$" comedy_movie1 db 10,13,"1. The Sober - 1hr 45mins RM11$" comedy_movie2 db 10,13,"2. SuperGood - 1hr 55mins RM12$" comedy_movie3 db 10,13,"3. Livepool - 2hrs 5mins RM13$" comedy_movie4 db 10,13,"4. 21 Walk Street - 1hr 50mins RM11$" comedy_movie5 db 10,13,"5. Teddy - 1hr 45mins RM10$" drama_movie1 db 10,13,"1. The Shawshank Redemption - 2hrs 22mins RM14$" drama_movie2 db 10,13,"2. Schindler's List - 3hrs 15mins RM15$" drama_movie3 db 10,13,"3. Forest Gump - 2hrs 22mins RM14$" drama_movie4 db 10,13,"4. The Godfather - 2hrs 55mins RM16$" drama_movie5 db 10,13,"5. The Red Mile - 3hrs 9mins RM15$" scifi_movie1 db 10,13,"1. Inception - 2hrs 28mins RM15$" scifi_movie2 db 10,13,"2. Blade Runner 2049 - 2hrs 44mins RM17$" scifi_movie3 db 10,13,"3. The Matrix - 2hrs 16mins RM14$" scifi_movie4 db 10,13,"4. Interstellar - 2hrs 49mins RM16$" scifi_movie5 db 10,13,"5. Moon Wars - 2hrs 1min RM13$" horror_movie1 db 10,13,"1. The Spiritual Healer - 2hrs 2mins RM12$" horror_movie2 db 10,13,"2. The Gleaming - 2hrs 26mins RM14$" horror_movie3 db 10,13,"3. Psychopath - 1hr 49mins RM11$" horror_movie4 db 10,13,"4. The Summoning - 1hr 52mins RM11$" horror_movie5 db 10,13,"5. A Daymare on Elm Street - 1 hr 31mins RM10$" action1_prices db 15 action2_prices db 13 action3_prices db 14 action4_prices db 12 action5_prices db 13 comedy1_prices db 11 comedy2_prices db 12 comedy3_prices db 13 comedy4_prices db 11 comedy5_prices db 10 drama1_prices db 14 drama2_prices db 15 drama3_prices db 14 drama4_prices db 16 drama5_prices db 15 scifi1_prices db 15 scifi2_prices db 17 scifi3_prices db 14 scifi4_prices db 16 scifi5_prices db 13 horror1_prices db 12 horror2_prices db 14 horror3_prices db 11 horror4_prices db 11 horror5_prices db 10 prompt_msg db 10,13,"Enter your choice (1-5): $" invalid_msg db 10,13,"Invalid choice. Please try again.$" quantity_msg db 10,13,"Enter the quantity: $" proceed_msg db 10,13,"Proceed to payment? (Y for Yes/N for No): $" payment_success_msg db 10,13,"Payment successful!$" payment_fail_msg db 10,13,"Payment failed. Please try again.$" menu_msg db 10,13,"Do you want to buy another ticket? (Y/N): $" goodbye_msg db 10,13,"Thank you for using City Cineplex Ticketing System. Enjoy your movie!$" beforetax_msg db 10,13,"This is your price before tax: $" TAX_RATE equ 105 username_buffer db 20, ? password_buffer db 20, ? category_selection db ? movie_selection db ? quantity db ? price_before_tax db ? payment_confirmation db ? price_after_tax db ? .CODE MAIN PROC MOV AX, @data MOV DS, AX ; Display welcome message MOV AH, 09h LEA DX, welcome_msg INT 21h login_prompt: ; Display message asking for username MOV AH, 09h LEA DX, enterName_msg INT 21h ; Read username input MOV AH, 0Ah MOV DX, OFFSET username_buffer INT 21h ; Display message asking for password MOV AH, 09h LEA DX, enterPwd_msg INT 21h ; Read password input MOV AH, 0Ah MOV DX, OFFSET password_buffer INT 21h ; Check if username and password are correct MOV SI, OFFSET username MOV DI, OFFSET username_buffer + 2 MOV CX, 7 ; Length of username CALL compare_strings ; Compare strings JC login_error ; If not equal, jump to error MOV SI, OFFSET password MOV DI, OFFSET password_buffer + 2 MOV CX, 5 ; Length of password CALL compare_strings ; Compare strings JC login_error ; If not equal, jump to error ; Username and password are correct, proceed to main menu MOV AH, 09h LEA DX, correct_msg INT 21h JMP MAIN_MENU compare_strings: ; Compare strings @@compare_loop: LODSB ; Load byte from SI into AL, increment SI MOV BL, [DI] ; Load byte from DI into BL CMP AL, BL ; Compare bytes JNE @@not_equal ; If not equal, jump to not_equal TEST AL, AL ; Check for end of string JZ @@equal ; If end of string, strings are equal INC DI ; Increment DI LOOP @@compare_loop ; Repeat loop @@not_equal: RET ; Return with carry flag set @@equal: CLC ; Clear carry flag RET ; Return login_error: ; Display error message MOV AH, 09h LEA DX, wrong_msg INT 21h JMP login_prompt ; Loop back to login prompt MAIN_MENU: ; Display categories MOV AH, 09h LEA DX, category1 INT 21h LEA DX, category2 INT 21h LEA DX, category3 INT 21h LEA DX, category4 INT 21h LEA DX, category5 INT 21h ; Read category selection MOV AH, 09h LEA DX, categories_msg INT 21h MOV AH, 01h INT 21h SUB AL, '0' ; Convert ASCII to number CMP AL, 1 JB invalid_category_selection CMP AL, 5 JA invalid_category_selection MOV category_selection, AL ; Display movies for the selected category MOV AH, 09h CMP category_selection, 1 JE display_action_movies CMP category_selection, 2 JE display_comedy_movies CMP category_selection, 3 JE display_drama_movies CMP category_selection, 4 JE display_scifi_movies CMP category_selection, 5 JE display_horror_movies JMP invalid_category_selection display_action_movies: MOV AH, 09h LEA DX, action_movie1 INT 21h LEA DX, action_movie2 INT 21h LEA DX, action_movie3 INT 21h LEA DX, action_movie4 INT 21h LEA DX, action_movie5 INT 21h JMP SELECT_ACTION display_comedy_movies: MOV AH, 09h LEA DX, comedy_movie1 INT 21h LEA DX, comedy_movie2 INT 21h LEA DX, comedy_movie3 INT 21h LEA DX, comedy_movie4 INT 21h LEA DX, comedy_movie5 INT 21h ;JMP SELECT_COMEDY display_drama_movies: MOV AH, 09h LEA DX, drama_movie1 INT 21h LEA DX, drama_movie2 INT 21h LEA DX, drama_movie3 INT 21h LEA DX, drama_movie4 INT 21h LEA DX, drama_movie5 INT 21h ;JMP SELECT_DRAMA display_scifi_movies: MOV AH, 09h LEA DX, scifi_movie1 INT 21h LEA DX, scifi_movie2 INT 21h LEA DX, scifi_movie3 INT 21h LEA DX, scifi_movie4 INT 21h LEA DX, scifi_movie5 INT 21h ;JMP SELECT_SCIFI display_horror_movies: MOV AH, 09h LEA DX, horror_movie1 INT 21h LEA DX, horror_movie2 INT 21h LEA DX, horror_movie3 INT 21h LEA DX, horror_movie4 INT 21h LEA DX, horror_movie5 INT 21h ;JMP SELECT_HORROR invalid_category_selection: ; Display error message MOV AH, 09h LEA DX, invalid_msg INT 21h JMP MAIN_MENU ; Loop back to main menu SELECT_ACTION: MOV AH,09h LEA DX,movies_msg INT 21h MOV AH,01h INT 21h SUB AL, '0' CMP AL,1 JB invalid_action_selection CMP AL,5 JA invalid_action_selection MOV movie_selection, AL MOV AH,09h CMP movie_selection, 1 JE action1 ; CMP movie_selection, 2 ;JE action2 ; CMP movie_selection, 3 ;JE action3 ; CMP movie_selection, 4 ;JE action4 ; CMP movie_selection, 5 ; JE action5 JMP invalid_category_selection action1: ; Display prompt for quantity MOV AH, 09h LEA DX, quantity_msg INT 21h ; Read quantity input MOV AH, 01h INT 21h SUB AL, '0' ; Convert ASCII to number MOV quantity, AL ; Multiply action1_prices with quantity INDEC3 PROC ;INDEC3 IS FOR TAKING INPUT FOR MULTIPLY WITH THE GIVEN AMOUNT PUSH BX ;TAKE VALUES INTO STACK PUSH CX PUSH DX XOR BX,BX ;HOLDS TOTAL XOR CX,CX ;SIGN MOV AH,1 ;TAKE CHARACTER IN AL INT 21H REPEAT4: CMP AL,48 ;IF AL<0, PRINT ERROR MESSAGE JL invalid_action_selection CMP AL,57 ;IF AL>9, PRINT ERRIR MESSAGE JG invalid_action_selection AND AX,00FH ;CONVERT TO DIGIT PUSH AX ;SAVE ON STACK MOV AX,10 ;GET 10 MUL BX ;AX=TOTAL * 10 POP BX ;GET DIGIT BACK ADD BX,AX ;TOTAL = TOTAL X 10 +DIGIT MOV AH,1 INT 21H CMP AL,0DH ;CARRIAGE RETURN JNE REPEAT4 ;IF NO CARRIEGE RETURN THEN MOVE ON MOV AX,BX ;STORE IN AX ;AND RETURN ; Display price before tax MOV AH, 09h LEA DX, beforetax_msg INT 21h ; Display the calculated price MOV AH, 09h LEA DX, price_before_tax INT 21h ; Continue with payment confirmation JMP PAYCONFIRMATION invalid_action_selection: ; Display error message MOV AH, 09h LEA DX, invalid_msg INT 21h JMP display_action_movies ; Loop back selection of action movies PAYCONFIRMATION: ; Display payment confirmation message MOV AH, 09h LEA DX, proceed_msg INT 21h ; Read payment confirmation MOV AH, 01h INT 21h CMP AL, 'Y' JNE not_proceed_payment ; Calculate price after tax MOV Ah, price_before_tax MOV Bh, TAX_RATE MUL Bh MOV Bh, 100 DIV BH MOV price_after_tax, AL ; Display price after tax MOV AH, 09h ; Display function MOV DL, '$' INT 21h MOV AH, price_after_tax ; Display payment success message MOV AH, 09h LEA DX, payment_success_msg INT 21h ; Prompt for another ticket purchase MOV AH, 09h LEA DX, menu_msg INT 21h ; Read menu choice MOV AH, 01h INT 21h CMP AL, 'Y' JNE exit_program ; Loop back to main menu JMP MAIN_MENU not_proceed_payment: ; Display goodbye message and exit MOV AH, 09h LEA DX, goodbye_msg INT 21h JMP exit_program exit_program: ; Exit program MOV AH, 4Ch INT 21h ascii_to_num: XOR AL, AL ; Clear AL to store result @@convert_loop: MOV AH, 0 ; Clear AH for DIV operation LODSB ; Load character into AL, increment SI CMP AL, 0DH ; Check for Enter key JE @@done ; If Enter, done converting SUB AL, '0' ; Convert ASCII character to numerical value CMP AL, 0 ; Check for valid digit (0-9) JB @@error ; If not a valid digit, exit with AL = 0 CMP AL, 9 ; Check if digit is greater than 9 JA @@error ; Multiply AL by 10 and add the current digit MOV BL, 10 MUL BL ADD AL, AH JMP @@convert_loop @@error: XOR AL, AL ; Set AL = 0 to indicate error RET @@done: RET END MAIN </code>
.MODEL SMALL
.STACK 100h

.DATA
    ; for login
    username db "testing$"   ;set username
    password db "1234$"      ; set password
    welcome_msg db 10,13,"Welcome to City Cineplex Ticketing System!$"
    enterName_msg db 10,13,"Please enter your username: $"
    enterPwd_msg db 10,13,"Please enter your password: $"
    wrong_msg db 10,13,"Invalid username or password. Please try again.$"
    correct_msg db 10,13,"Login successful!$"

    categories_msg db 10,13,"Please choose a category (1-5): $"
    
    category1 db 10,13,"1. Action$"
    category2 db 10,13,"2. Comedy$"
    category3 db 10,13,"3. Drama$"
    category4 db 10,13,"4. Sci-Fi$"
    category5 db 10,13,"5. Horror$"

    movies_msg db 10,13,"Please choose a movie(1-5): $"

    action_movie1 db 10,13,10,13,"1. Avengers: Startgame        - 2hrs 30mins     RM15$"
    action_movie2 db 10,13,"2. Mission possible           - 2hrs 15mins     RM13$"
    action_movie3 db 10,13,"3. Slow & Calm 100            - 2hrs 20mins     RM14$"
    action_movie4 db 10,13,"4. John Wick: Chapter 30      - 2hrs 10mins     RM12$"
    action_movie5 db 10,13,"5. White Panther              - 2hrs 15mins     RM13$"
    
    comedy_movie1 db 10,13,"1. The Sober                  - 1hr  45mins     RM11$"
    comedy_movie2 db 10,13,"2. SuperGood                  - 1hr  55mins     RM12$"
    comedy_movie3 db 10,13,"3. Livepool                   - 2hrs 5mins      RM13$"
    comedy_movie4 db 10,13,"4. 21 Walk Street             - 1hr  50mins     RM11$"
    comedy_movie5 db 10,13,"5. Teddy                      - 1hr  45mins     RM10$"
    
    drama_movie1  db 10,13,"1. The Shawshank Redemption   - 2hrs 22mins     RM14$"
    drama_movie2  db 10,13,"2. Schindler's List           - 3hrs 15mins     RM15$"
    drama_movie3  db 10,13,"3. Forest Gump                - 2hrs 22mins     RM14$"
    drama_movie4  db 10,13,"4. The Godfather              - 2hrs 55mins     RM16$"
    drama_movie5  db 10,13,"5. The Red Mile               - 3hrs 9mins      RM15$"
    
    scifi_movie1  db 10,13,"1. Inception                  - 2hrs 28mins     RM15$"
    scifi_movie2  db 10,13,"2. Blade Runner 2049          - 2hrs 44mins     RM17$"
    scifi_movie3  db 10,13,"3. The Matrix                 - 2hrs 16mins     RM14$"
    scifi_movie4  db 10,13,"4. Interstellar               - 2hrs 49mins     RM16$"
    scifi_movie5  db 10,13,"5. Moon Wars                  - 2hrs 1min       RM13$"
    
    horror_movie1 db 10,13,"1. The Spiritual Healer       - 2hrs 2mins      RM12$"
    horror_movie2 db 10,13,"2. The Gleaming               - 2hrs 26mins     RM14$"
    horror_movie3 db 10,13,"3. Psychopath                 - 1hr  49mins     RM11$"
    horror_movie4 db 10,13,"4. The Summoning              - 1hr  52mins     RM11$"
    horror_movie5 db 10,13,"5. A Daymare on Elm Street    - 1 hr 31mins     RM10$"

    action1_prices db 15
    action2_prices db 13
    action3_prices db 14
    action4_prices db 12
    action5_prices db 13 
    
    comedy1_prices db 11
    comedy2_prices db 12
    comedy3_prices db 13
    comedy4_prices db 11
    comedy5_prices db 10          
    
    drama1_prices db 14
    drama2_prices db 15
    drama3_prices db 14
    drama4_prices db 16
    drama5_prices db 15

    scifi1_prices db 15
    scifi2_prices db 17
    scifi3_prices db 14
    scifi4_prices db 16
    scifi5_prices db 13 
    
    horror1_prices db 12
    horror2_prices db 14
    horror3_prices db 11
    horror4_prices db 11
    horror5_prices db 10
    

    prompt_msg db 10,13,"Enter your choice (1-5): $"
    invalid_msg db 10,13,"Invalid choice. Please try again.$"
    quantity_msg db 10,13,"Enter the quantity: $"
    proceed_msg db 10,13,"Proceed to payment? (Y for Yes/N for No): $"
    payment_success_msg db 10,13,"Payment successful!$"
    payment_fail_msg db 10,13,"Payment failed. Please try again.$"
    menu_msg db 10,13,"Do you want to buy another ticket? (Y/N): $"
    goodbye_msg db 10,13,"Thank you for using City Cineplex Ticketing System. Enjoy your movie!$"
    beforetax_msg db 10,13,"This is your price before tax: $"
    
    TAX_RATE equ 105
    username_buffer db 20, ?      
    password_buffer db 20, ?      
    category_selection db ?
    movie_selection db ?
    quantity db ?
    price_before_tax db ?
    payment_confirmation db ?
    price_after_tax db ?


.CODE
MAIN PROC
    MOV AX, @data
    MOV DS, AX  

    ; Display welcome message
    MOV AH, 09h
    LEA DX, welcome_msg
    INT 21h

login_prompt:
    ; Display message asking for username
    MOV AH, 09h
    LEA DX, enterName_msg
    INT 21h

    ; Read username input
    MOV AH, 0Ah
    MOV DX, OFFSET username_buffer
    INT 21h

    ; Display message asking for password
    MOV AH, 09h
    LEA DX, enterPwd_msg
    INT 21h

    ; Read password input
    MOV AH, 0Ah
    MOV DX, OFFSET password_buffer
    INT 21h

    ; Check if username and password are correct
    MOV SI, OFFSET username
    MOV DI, OFFSET username_buffer + 2
    MOV CX, 7   ; Length of username
    CALL compare_strings  ; Compare strings
    JC login_error ; If not equal, jump to error
    MOV SI, OFFSET password
    MOV DI, OFFSET password_buffer + 2
    MOV CX, 5   ; Length of password
    CALL compare_strings  ; Compare strings
    JC login_error ; If not equal, jump to error

    ; Username and password are correct, proceed to main menu
    MOV AH, 09h
    LEA DX, correct_msg
    INT 21h

    JMP MAIN_MENU

compare_strings:
    ; Compare strings
    @@compare_loop:
        LODSB  ; Load byte from SI into AL, increment SI
        MOV BL, [DI] ; Load byte from DI into BL
        CMP AL, BL ; Compare bytes
        JNE @@not_equal ; If not equal, jump to not_equal
        TEST AL, AL ; Check for end of string
        JZ @@equal ; If end of string, strings are equal
        INC DI ; Increment DI
        LOOP @@compare_loop ; Repeat loop
    @@not_equal:
        RET ; Return with carry flag set
    @@equal:
        CLC ; Clear carry flag
        RET ; Return
login_error:
    ; Display error message
    MOV AH, 09h
    LEA DX, wrong_msg
    INT 21h
    JMP login_prompt ; Loop back to login prompt

MAIN_MENU:
    ; Display categories
   MOV AH, 09h
    LEA DX, category1
    INT 21h
    LEA DX, category2
    INT 21h
    LEA DX, category3
    INT 21h
    LEA DX, category4
    INT 21h
    LEA DX, category5
    INT 21h

    ; Read category selection
    MOV AH, 09h
    LEA DX, categories_msg
    INT 21h
    MOV AH, 01h
    INT 21h
    SUB AL, '0'    ; Convert ASCII to number
    CMP AL, 1
    JB invalid_category_selection      
    CMP AL, 5
    JA invalid_category_selection
    MOV category_selection, AL



    ; Display movies for the selected category
    MOV AH, 09h
    CMP category_selection, 1
    JE display_action_movies
    CMP category_selection, 2
    JE display_comedy_movies
    CMP category_selection, 3
    JE display_drama_movies
    CMP category_selection, 4
    JE display_scifi_movies
    CMP category_selection, 5
    JE display_horror_movies
    JMP invalid_category_selection

display_action_movies:
    MOV AH, 09h
    LEA DX, action_movie1
    INT 21h
    LEA DX, action_movie2
    INT 21h
    LEA DX, action_movie3
    INT 21h
    LEA DX, action_movie4
    INT 21h
    LEA DX, action_movie5
    INT 21h
    JMP SELECT_ACTION

display_comedy_movies:
    MOV AH, 09h
    LEA DX, comedy_movie1
    INT 21h
    LEA DX, comedy_movie2
    INT 21h
    LEA DX, comedy_movie3
    INT 21h
    LEA DX, comedy_movie4
    INT 21h
    LEA DX, comedy_movie5
    INT 21h
    ;JMP SELECT_COMEDY

display_drama_movies:
    MOV AH, 09h
    LEA DX, drama_movie1
    INT 21h
    LEA DX, drama_movie2
    INT 21h
    LEA DX, drama_movie3
    INT 21h
    LEA DX, drama_movie4
    INT 21h
    LEA DX, drama_movie5
    INT 21h
    ;JMP SELECT_DRAMA

display_scifi_movies:
    MOV AH, 09h
    LEA DX, scifi_movie1
    INT 21h
    LEA DX, scifi_movie2
    INT 21h
    LEA DX, scifi_movie3
    INT 21h
    LEA DX, scifi_movie4
    INT 21h
    LEA DX, scifi_movie5
    INT 21h
    ;JMP SELECT_SCIFI

display_horror_movies:
    MOV AH, 09h
    LEA DX, horror_movie1
    INT 21h
    LEA DX, horror_movie2
    INT 21h
    LEA DX, horror_movie3
    INT 21h
    LEA DX, horror_movie4
    INT 21h
    LEA DX, horror_movie5
    INT 21h
    ;JMP SELECT_HORROR

invalid_category_selection:
    ; Display error message
    MOV AH, 09h
    LEA DX, invalid_msg
    INT 21h
    JMP MAIN_MENU ; Loop back to main menu

SELECT_ACTION:
    MOV AH,09h
    LEA DX,movies_msg
    INT 21h  
    
    MOV AH,01h
    INT 21h
    SUB AL, '0'
    CMP AL,1
    JB invalid_action_selection
    CMP AL,5
    JA invalid_action_selection
    MOV movie_selection, AL
    
    MOV AH,09h
    CMP movie_selection, 1
    JE action1
   ; CMP movie_selection, 2
    ;JE action2
   ; CMP movie_selection, 3
    ;JE action3
   ; CMP movie_selection, 4
    ;JE action4
   ; CMP movie_selection, 5
   ; JE action5
   JMP invalid_category_selection 
    
action1:
    ; Display prompt for quantity
    MOV AH, 09h
    LEA DX, quantity_msg
    INT 21h
    
    ; Read quantity input
    MOV AH, 01h
    INT 21h
    SUB AL, '0'    ; Convert ASCII to number
    MOV quantity, AL

    ; Multiply action1_prices with quantity
   
INDEC3 PROC                        ;INDEC3 IS FOR TAKING INPUT FOR MULTIPLY WITH THE GIVEN AMOUNT
    
    PUSH BX                        ;TAKE VALUES INTO STACK 
    PUSH CX
    PUSH DX

    
    
    XOR BX,BX                       ;HOLDS TOTAL
    
    XOR CX,CX                       ;SIGN
                    
    
    MOV AH,1                        ;TAKE CHARACTER IN AL
    INT 21H


    
    REPEAT4: 
                                     
    CMP AL,48                       ;IF AL<0, PRINT ERROR MESSAGE
    JL invalid_action_selection
    
    CMP AL,57                       ;IF AL>9, PRINT ERRIR MESSAGE 
    JG invalid_action_selection

    AND AX,00FH                     ;CONVERT TO DIGIT
    PUSH AX                         ;SAVE ON STACK
    
    MOV AX,10                       ;GET 10
    MUL BX                          ;AX=TOTAL * 10
    POP BX                          ;GET DIGIT BACK
    ADD BX,AX                       ;TOTAL = TOTAL X 10 +DIGIT
    
    
    MOV AH,1
    INT 21H
    
    CMP AL,0DH                      ;CARRIAGE RETURN
    JNE REPEAT4                     ;IF NO CARRIEGE RETURN THEN MOVE ON
    
    MOV AX,BX                       ;STORE IN AX
    
                             ;AND RETURN
    ; Display price before tax
    MOV AH, 09h
    LEA DX, beforetax_msg
    INT 21h
    
    ; Display the calculated price
    MOV AH, 09h
    LEA DX, price_before_tax
    INT 21h


    ; Continue with payment confirmation
    JMP PAYCONFIRMATION


invalid_action_selection:
    ; Display error message
    MOV AH, 09h
    LEA DX, invalid_msg
    INT 21h
    JMP display_action_movies ; Loop back selection of action movies




PAYCONFIRMATION:
    ; Display payment confirmation message
    MOV AH, 09h
    LEA DX, proceed_msg
    INT 21h

    ; Read payment confirmation
    MOV AH, 01h
    INT 21h
    CMP AL, 'Y'
    JNE not_proceed_payment

    ; Calculate price after tax
    MOV Ah, price_before_tax
    MOV Bh, TAX_RATE
    MUL Bh
    MOV Bh, 100
    DIV BH
    MOV price_after_tax, AL

    ; Display price after tax
    MOV AH, 09h   ; Display function
    MOV DL, '$'
    INT 21h
    MOV AH, price_after_tax


    ; Display payment success message
    MOV AH, 09h
    LEA DX, payment_success_msg
    INT 21h

    ; Prompt for another ticket purchase
    MOV AH, 09h
    LEA DX, menu_msg
    INT 21h

    ; Read menu choice
    MOV AH, 01h
    INT 21h
    CMP AL, 'Y'
    JNE exit_program

    ; Loop back to main menu
    JMP MAIN_MENU

not_proceed_payment:
    ; Display goodbye message and exit
    MOV AH, 09h
    LEA DX, goodbye_msg
    INT 21h
    JMP exit_program

exit_program:
    ; Exit program
    MOV AH, 4Ch
    INT 21h
ascii_to_num:
    XOR AL, AL     ; Clear AL to store result
    @@convert_loop:
        MOV AH, 0    ; Clear AH for DIV operation
        LODSB        ; Load character into AL, increment SI
        CMP AL, 0DH  ; Check for Enter key
        JE @@done    ; If Enter, done converting
        SUB AL, '0'  ; Convert ASCII character to numerical value
        CMP AL, 0    ; Check for valid digit (0-9)
        JB @@error   ; If not a valid digit, exit with AL = 0
        CMP AL, 9    ; Check if digit is greater than 9
        JA @@error
        ; Multiply AL by 10 and add the current digit
        MOV BL, 10
        MUL BL
        ADD AL, AH
        JMP @@convert_loop
    @@error:
        XOR AL, AL   ; Set AL = 0 to indicate error
        RET
    @@done:
        RET



END MAIN

The system flow should be the user enter the category, it will list out all the movie in the selected categories. After that, user need to choose the movie and enter the quantity. The system should show the price before tax. Then system should ask the user to proceed to payment or not. If not , jump back to the movie selection. If yes, display the parice after adding the 5% service tax.Then user need to go the payment part.

  • assembly
  • emu8086

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Filed under: Kiến thức lập trình - @ 11:57

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Trang chủ Giới thiệu Sinh nhật bé trai Sinh nhật bé gái Tổ chức sự kiện Biểu diễn giải trí Dịch vụ khác Trang trí tiệc cưới Tổ chức khai trương Tư vấn dịch vụ Thư viện ảnh Tin tức - sự kiện Liên hệ Chú hề sinh nhật Trang trí YEAR END PARTY công ty Trang trí tất niên cuối năm Trang trí tất niên xu hướng mới nhất Trang trí sinh nhật bé trai Hải Đăng Trang trí sinh nhật bé Khánh Vân Trang trí sinh nhật Bích Ngân Trang trí sinh nhật bé Thanh Trang Thuê ông già Noel phát quà Biểu diễn xiếc khỉ Xiếc quay đĩa
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