习题2.36(80x86版)

.model small
.data
displayPutin DB "Input Number:0~9:$"
displayError DB "Error!",0dh,0ah,'$'
.code
main PROC
    mov ax,@data
    mov ds,ax
AGAIN:
    mov ah,09h
    mov dx,OFFSET displayPutin
    int 21h
    mov ah,00h
    int 21h
    cmp al,30h
    js ERRORLEABE
    cmp al,3ah
    jns ERRORLEABE
    mov dl,0dh
    mov ah,01h
    int 21h
    mov dl,0ah
    int 21h
    mov dl,al
    int 21h
    jmp QUIT
ERRORLEABE:
    mov ah,09h
    mov dx,OFFSET displayError
    int 21h
    jmp AGAIN
QUIT:
    mov ah,4ch
    int 21h
main ENDP
END main

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