无符号长整型数，它给出输入字符串的IL偏移量，或在没有IL偏移量或字符串格式不良时给出零。
Offset Unsigned long integer giving the IL offset from the input string, or zero if there was no IL offset or the string was not well formed.
如果你在你的表达式中用到ul(表示无符号长整型)，那么你有了一个好的起点。
If you in your expression used UL (said unsigned long integer), then you have a good starting point.
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