In Assembly Language Programming

I already have most of the code done I just need to add a function that displays and classifies the entered character in number, letter or symbol. Example if the user enters A then the programs displays: A - letter, 3 - number, & - symbol.

The code is the following:

.MODEL SMALL

.STACK

.DATA

STRING db "Enter a character: ",13,10,13,10,'$' CHARACTER db ?

.CODE MAIN PROC MOV AX, @DATA MOV DS, AX ; your code goes here

call SHOW_STRING

call READ_CHARACTER call WRITE_CHARACTER

call CLEAR_KEYBOARD_BUFFER

MOV AX, 4C00h INT 21h

MAIN ENDP

;***********************************************************************************

SHOW_STRING PROC mov dx, offset STRING ; write all characters mov ah, 9 ; in the standard output int 21h ; DX has the offset of the first character RET ; the last character must be '$' SHOW_STRING ENDP

;***********************************************************************************

WRITE_CHARACTER PROC mov ah, 2h ; write a character to standard output mov dl, CHARACTER ; DL has the character int 21H RET WRITE_CHARACTER ENDP

;***********************************************************************************

READ_CHARACTER PROC mov ah, 8h ; read a character without echo from standard input int 21h ; AL stores the character read mov CHARACTER, al RET READ_CHARACTER ENDP

;*********************************************************************************** CLEAR_KEYBOARD_BUFFER PROC mov ah, 0bh ; check standard input status int 21h ; AL = 0 if input buffer is empty

cmp al, 0h ; jz CLEARED ; are there no more characters in the standard input NEXT: call READ_CHARACTER mov ah, 0bh ; check standard input status int 21h ; AL = 0 if input buffer is empty cmp al, 0h ; jnz NEXT ; are there more characters in the standard input CLEARED: RET CLEAR_KEYBOARD_BUFFER ENDP end MAIN