Unfortunatly checking for non-digits is not sufficient
since these are all numbers:
Checking just for non-digits won't work on those.
And you cannot just check for digits, E, e, and .,
since these are all not numbers
- ...
- Eeeeeee.
- 12e
- e15
- 1.6.8
The only thing that your technique will work for
is integers -- certainly not the only thing meant by 'number'.
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