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// Source : https://oj.leetcode.com/problems/valid-number/
// Author : Hao Chen
// Date : 2014-08-26
/**********************************************************************************
*
* Validate if a given string is numeric.
*
* Some examples:
* "0" => true
* " 0.1 " => true
* "abc" => false
* "1 a" => false
* "2e10" => true
*
* Note: It is intended for the problem statement to be ambiguous.
* You should gather all requirements up front before implementing one.
*
*
**********************************************************************************/
#include
using namespace std;
bool isdigit(const char c){
return (c>='0' && c