LeetCode: 65. Valid Number

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65. Valid Number

LeetCode - Valid Number

Validate if a given string can be interpreted as a decimal number.

Some examples:

"0" ⇒ true

" 0.1 " ⇒ true

"abc" ⇒ false

"1 a" ⇒ false

"2e10" ⇒ true

" -90e3 " ⇒ true

" 1e" ⇒ false

"e3" ⇒ false

" 6e-1" ⇒ true

" 99e2.5 " ⇒ false

"53.5e93" ⇒ true

" --6 " ⇒ false

"-+3" ⇒ false

"95a54e53" ⇒ false

Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before implementing one. However, here is a list of characters that can be in a valid decimal number:

Numbers 0-9
Exponent - "e"
Positive/negative sign - "+"/"-"
Decimal point - "."

Of course, the context of these characters also matters in the input.

Update (2015-02-10):

The signature of the C++ function had been updated. If you still see your function signature accepts a const char * argument, please click the reload button to reset your code definition.

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// TODO Hard