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TITLE MASM Template                        (main.asm)

; Description:
; 
; Revision date:

INCLUDE Irvine32.inc
.data
msg1 byte "input data: ",0
buffer byte 34 DUP('0')
bytecount dword ?

.code
main PROC
    call Clrscr
    .REPEAT
    
        mov edx,offset msg1
        call WriteString
    
        mov edx,offset buffer
        mov ecx,sizeof buffer
        call ReadString
        mov bytecount,eax
        mov eax,0
    
        mov ebx,bytecount
        
        .IF buffer[ebx] =='H'
        mov esi,0
        call Check
        .ELSEIF buffer[ebx] =='h'
        mov esi,0
        call Check
        .ELSE
            jmp QUIT
        .ENDIF
    
    .UNTIL eax=='*'
    
    QUIT:
    mov eax,'*' ;to stop
    
    exit
main ENDP
Check PROC USES esi eax
.WHILE esi < bytecount
    mov al,buffer[esi]
    .IF al == '1'
    inc esi
    .ELSEIF al == '2'
    inc esi
    .ELSEIF al == '3'
    inc esi
    .ELSEIF al == '4'
    inc esi
    .ELSEIF al == '5'
    inc esi
    .ELSEIF al == '6'
    inc esi
    .ELSEIF al == '7'
    inc esi
    .ELSEIF al == '8'
    inc esi
    .ELSEIF al == '9'
    inc esi
    .ELSEIF al == 'A'
    inc esi
    .ELSEIF al == 'B'
    inc esi
    .ELSEIF al == 'C'
    inc esi
    .ELSEIF al == 'D'
    inc esi
    .ELSEIF al == 'E'
    inc esi
    .ELSEIF al == 'F'
    inc esi
    .ELSE
        mov al,'*'
        .BREAK
    .ENDIF
.ENDW
ret
Check ENDP
END main

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