Given the following constructor code, which of the statements are true?
public book (string isenofbook, double priceofbook, int numberorderedofbook) if (isbnofbook ) == throw new blankisbn) if (priceofbook < 0) throw new negativeprice (priceofbook) if (numberedorderedofbook < 0) throw neu negativenumberordered(nurberordered v): isbn = 1senof book ; price priceof book; numberedordered = nurtberor dere dofbook;
a.)there is an error: a throws clause should be added to the constructor header.
b.)classes extending the exception class should be created for each of the custom exceptions that are thrown in the constructor.
c.)the calling method must handle the exceptions thrown in the constructor, or have its own throws clause specifying them
d.)all of these

Write a new lc-3 trap subroutine (i.e. a subroutine that will be invoked via the trap instruction) that will receive a numeric digit entered at the keyboard (i.e. an ascii character), echo it to the screen, and return in r0 the corresponding numeric value: so if the user types the digit '7', the character '7' will appear on the screen, but the value returned in r0 will be b0000 0000 0000 0111 (#7) you may not use any trap calls in your code - you must implement the "polling" code that interrogates the keyboard status and data registers. ; getnum_tsr ; a subroutine for obtaining a numeric value ; given ascii numeric digit input to keyboard. ; the numeric digit is echoed to the console (e.g. '7' = b0000 0000 0011 0111), ; but the value returned in r0 is the actual numeric value ; corresponding to the digit (e.g. b0000 0000 0000 0111 =