The Fake Geek's blog: Check if a string is a number

The Fake Geek's blog: Check if a string is a number

A very simple question. I use the traditional check-every-character way.

1. if the character is '-' but is not at the beginning of the string, return false;

2. else if there are more than one dots in the string, return false;

3. else if other characters are not digits, return false. 

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