* @return The @c signed @c char equivalent of the specified string representing the numeric value using the specified index
* @param[in] s A string representing a numeric value
* @param[in] radix The radix of the string representing a numeric value @n
- * It must either be 2, 8, 10, or 16.
+ * Radix value range is from 2 to 36.
* @param[out] ret The result of the operation
* @exception E_SUCCESS The method is successful.
* @exception E_NUM_FORMAT The specified string does not contain a number that can be parsed.