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只要是浮点舍入，都有可能误差的

Posted by hawk at 2005-05-06 17:11:47 on Problem 2150
In Reply To:不需要，最多才7个有效数字，算法对了用double就错不了的 Posted by:frkstyc at 2005-05-06 17:08:37 
比如保留1位
2.049999999999999
就可能变成2.1或者2.0
就看数据中有没有这么巧的了
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