[TriLUG] tax forms and JavaScript

[mr-trilug via TriLUG]

This is a query about JavaScript programming.

The NC-DOR D-400 web-fill form instructions assert: "Enter Whole U.S. 
Dollars Only."
     To me this means: do NOT enter a decimal and two digits, including 
".00."
     To DOR it appears to mean enter with ".00", e.g. "xxxxxx.00".

Questions:

 1. Is my interpretation, "xxxxxxx" reasonable?
 2. Would JavaScript have any difficulty in being programmed to read
    both xxxxxxx. AND xxxxxxx.cc, including xxxxxx.00? Why should it
    matter to JS?
 3. If the answer to [2] is NO DIFFICULTY, would JavaScript just do the
    proper calculations by default or would it need some extra code to
    cope with numbers in different formats?

Thanks for comments.

M. Rulison