Answer to Question #349366 in Assembler for sdhjkh

Question

Create an assembly program that would check if the input character is a numeric character. alphabet (letter) or a special character.

HINT: Each character has a corresponding decimal and hex values in the ASC table. Use ASCII table.

Answer 1

; DosBox
DATA SEGMENT
msgEnter    db "Char: $"
AlphCh    db " - character is an alphabet$"
NumberCh    db " - character is a number$"
SpecialCh    db " - character isa special symbol$"
DATA ENDS

CODE SEGMENT
ASSUME DS:DATA,CS:CODE
START:
    MOV AX,DATA
    MOV DS,AX

    mov dx, offset msgEnter
    mov ah, 9
    int 21h    
    
; wait for any key press:
    mov ah, 0
    int 16h    
    mov     ah, 0eh
    int     10h  
    
; Check char
   cmp al,'0'
   jl special            ; char < '0'
   cmp al,':'
   jl number            
   cmp al,'A'
   jl special      
  cmp al,'['
   jl alph    ;    
   cmp al,'a'
   jl special       
  cmp al,'{'
   jl alph    ;    
   jmp special
number:
    mov dx, offset NumberCh
    mov ah, 9
    int 21h     
      jmp      EXIT_PROG        
alph:
    mov dx, offset AlphCh
    mov ah, 9
    int 21h     
      jmp      EXIT_PROG    
special:
    mov dx, offset SpecialCh
    mov ah, 9
    int 21h  
  EXIT_PROG:            ; Program is terminated
     MOV AH,4CH
     INT 21H