字符转数字

msdn中使用字符串转数字、数字转字符串:_strtoui64, _wcstoui64,
_strtoui64_l, _wcstoui64_l, _itoa, _i64toa, _ui64toa,
_itow, _i64tow, _ui64tow

msdn当中有这么一句:Base of value; which must be in the range2–36和
Number base to use.

调试发现指的是进制。十进制、二进制等(最多2-36)

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