Please write in assembly language. Need procedure for option 2, option 3, and option 6

Description: This program presents a menu allowing the user to pick a menu option

; which then performs a given task.

; If the user has not entered a string, options 2 through 5 can not be

; accomplished and the user should be prompted to enter a string.

; The palidrome check should not be case-sensitive or care about punctuation,

; to include spaces.The user will be allowed to enter a string containing any

; symbol or number on the standard QWERTY keyboard.

; When option 5 is selected, print the existing string(modified by other options or not)

; Option 4 prints the string and informs the user if the string is a palindrome or not.

; With options 2 - 3, print the string received by the option, and

; then the resulting string.

; The max string length must be a symbolic constant and used where necessary.

; Option Definitions

; 1. The user enters a string of no more than 100 characters.

; 2. The entered string is converted to lower case.

; 3. The entered string has all non - letter elements removed except numbers.

; 4. Is the entered string a palindrome?

; 5. Print the string.

; 6. Exit

; ====================================================================================

;// Your assignment is to implement all remaining functionality and error checking as required.

;// Remember this code allows the user to keep entering strings until

Include Irvine32.inc

;//Macros

ClearEAX textequ

ClearEBX textequ

ClearECX textequ

ClearEDX textequ

ClearESI textequ

ClearEDI textequ

Newline textequ <0ah, 0dh>

maxLength = 101d

.data

UserOption byte 0h

theString byte maxLength dup(0) ; // declares the array to be used throughout the program.

theStringLen byte 0

errormessage byte 'You have entered an invalid option. Please try again.', Newline, 0h

.code

main PROC

call ClearRegisters ;// clears registers

startHere:

mov ebx, OFFSET UserOption

call displayMenu

mov edx, offset theString

mov ecx, lengthof theString

opt1:

cmp useroption, 1

jne opt2

call clrscr

mov ebx, offset thestringlen ;// will hold the length of the entered string

call option1

jmp starthere

opt2:

cmp useroption, 2

jne opt3

call clrscr

movzx ecx, thestringlen

call option2

jmp starthere

opt3:

;// awaiting development

opt4:

;// awaiting development

opt5:

cmp useroption, 5

jne opt6

call clrscr

call option5

call waitmsg

jmp starthere

opt6:

cmp useroption, 6

jne oops ;// invalid entry

jmp quitit

;// error check

oops:

push edx

mov edx, offset errormessage

call writestring

call waitmsg

pop edx

jmp starthere

quitit:

exit

main ENDP

;// Procedures

;// ===============================================================

DisplayMenu Proc

;// Description: Displays the Main Menu to the screen and gets user input

;// Receives: Offset of UserOption variable in ebx

;// Returns: User input will be saved to UserOption variable

.data

MainMenu byte 'MAIN MENU', 0Ah, 0Dh,

'==========', 0Ah, 0Dh,

'1. Enter a String:', 0Ah, 0Dh,

'2. Convert all elements to lower case: ',0Ah, 0Dh,

'3. Remove all non-letter elements: ',0Ah, 0Dh,

'4. Determine if the string is a palindrome: ',0Ah, 0Dh,

'5. Display the string: ',0Ah, 0Dh,

'6. Exit: ',0Ah, 0Dh, 0Ah, 0Dh,

'Please enter a number between 1 and 6 -->', 0h

.code

push edx ;// preserves current value of edx

call clrscr

mov edx, offset MainMenu ;// required by WriteString

call WriteString

call readhex ;// get user input

mov byte ptr [ebx], al ;// save user input to UserOption

pop edx ;// restores current value of edx

ret

DisplayMenu ENDP

ClearRegisters Proc

;// Description: Clears the registers EAX, EBX, ECX, EDX, ESI, EDI

;// Requires: Nothing

;// Returns: Nothing, but all registers will be cleared.

cleareax

clearebx

clearecx

clearedx

clearesi

clearedi

ret

ClearRegisters ENDP

;// ---------------------------------------------------------------

option1 proc uses edx ecx

;// Description: Gets string from user.

;// Receives: Address of string

;// Returns: String is modified and length of entered string is in saved in theStringLen

.data

option1prompt byte 'Please enter a string of characters (', maxLength, ' or less): ', newline, '---> ', 0h

.code

push edx ;//saving the address of the string pass in.

mov edx, offset option1prompt

call writestring

pop edx

;//add procedure to clear string (loop through and place zeros)

call readstring

mov byte ptr [ebx], al ;//length of user entered string, now in thestringlen

ret

option1 endp

option2 proc uses edx

;// Description: Converts all elements to lower case

;// Receives: address of string in edx

;// Returns: noting, but string is now lower case.

.data

opt2prompt1 byte "Original :", newline , 0

opt2prompt2 byte "Modified :", newline,0

.code

push edx

mov edx, offset opt2prompt1

call writestring

pop edx

call option5

call crlf

push edx

L2:

mov al, byte ptr [edx+esi]

cmp al, 41h

jb keepgoing ;// not a letter

cmp al, 5ah

ja keepgoing ;// not a letter

or al, 20h ;//could use add al, to convert to lower case.

mov byte ptr [edx+esi], al ;// letter now lower case

keepgoing:

inc esi

loop L2

mov edx, offset opt2prompt2

call writestring

pop edx

call option5

call waitmsg

ret

option2 endp

option5 proc

;// Description: Displays the string.

;// Receives: address of string in edx

;// Returns: nothing

.data

option5prompt byte 'The String is: ', 0h

.code

push edx ;// save the address of the string to write prompt

mov edx, offset option5prompt

call writestring

pop edx

call writestring ;// write the string

call crlf

ret

option5 endp

END main