$.$model small

$.$stack $100$h

$.$data

names db $5*20$ dup$(\text{'}$$$\text{'})$ ; Array for $5$ names, each $20$ characters long

number$\_$of$\_$names db $5$ ; Total number of names

menu$\_$prompt db "Select an option:", $13,10$

db $"1.$ Select Number and Length of Names", $13,10$

db $"2.$ Enter Names", $13,10$

db $"3.$ Perform Ascending Sorting", $13,10$

db $"4.$ Perform Descending Sorting", $13,10$

db $"5.$ Display Sorted Names", $13,10$

db $"6.$ Exit", $13,10,\text{'}$$$\text{'}$

name$\_$prompt db "Enter name: $$"$

number$\_$prompt db "Enter the number of names to display: $$"$

invalid$\_$input$\_$msg db "Invalid input, try again.$$"$

$.$code

main proc

mov ax$,$ @data

mov ds$,$ ax

call display$\_$menu

jmp exit$\_$program

display$\_$menu:

mov ah$,09$h

lea dx$,$ menu$\_$prompt

int $21$h

call get$\_$option

cmp al$,1$

je select$\_$number$\_$and$\_$length$\_$of$\_$names

cmp al$,2$

je enter$\_$names

cmp al$,3$

je sort$\_$ascending

cmp al$,4$

je sort$\_$descending

cmp al$,5$

je display$\_$sorted$\_$names

cmp al$,6$

jmp exit$\_$program ; Correctly handle exit without looping

get$\_$option:

mov ah$,01$h ; Read character

int $21$h ; from keyboard

sub al$,\text{'}0\text{'}$ ; Convert ASCII to integer

cmp al$,6$

ja display$\_$menu ; Jump if input $>6($invalid$)$

ret

select$\_$number$\_$and$\_$length$\_$of$\_$names:

mov ah$,09$h

lea dx$,$ number$\_$prompt

int $21$h

call get$\_$number$\_$of$\_$names

jmp display$\_$menu

get$\_$number$\_$of$\_$names:

mov ah$,01$h ; Read character

int $21$h ; from keyboard

sub al$,\text{'}0\text{'}$ ; Convert ASCII to integer

cmp al$,5$

ja select$\_$number$\_$and$\_$length$\_$of$\_$names ; Jump if input $>5($invalid$)$

mov number$\_$of$\_$names, al

ret

enter$\_$names:

xor bx$,$ bx ; Reset BX to use as index for names array

xor cx$,$ cx ; Clear CX to use it for counting

mov cl$,$ number$\_$of$\_$names ; Load the number of names to enter into CL

enter$\_$loop:

lea dx$,$ name$\_$prompt ; Load address of name prompt into DX

mov ah$,09$h ; Function to output string at DS:DX

int $21$h ; DOS interrupt

lea dx$,$ names$[$bx$]$ ; Point DX to the current name entry in the array

mov ah$,0$Ah ; Function to read string into buffer at DS:DX

int $21$h ; DOS interrupt

add bx$,20$ ; Move to the next name slot in the array

loop enter$\_$loop ; Repeat for the number of names

jmp display$\_$menu ; Return to the main menu after entering names

sort$\_$ascending:

jmp display$\_$menu

sort$\_$descending:

jmp display$\_$menu

display$\_$sorted$\_$names:

mov bx$,0$

mov cl$,$ number$\_$of$\_$names

display$\_$loop:

lea dx$,$ names$[$bx$]$

mov ah$,09$h

int $21$h

call display$\_$new$\_$line

add bx$,20$

loop display$\_$loop

jmp display$\_$menu

display$\_$new$\_$line:

mov ah$,02$h

mov dl$,13$

int $21$h

mov dl$,10$

int $21$h

ret

exit$\_$program:

mov ax$,4$C$00$h ; Terminate program with return code $0$

int $21$h

main endp

end main

complete this code of ascending and descending part