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发帖纪念一下

Posted by digiter at 2008-11-14 20:11:49 on Problem 1266 and last updated at 2008-11-14 20:12:16 
1.atan2
http://www.cplusplus.com/reference/clibrary/cmath/atan2.html

2.ceil
http://www.cplusplus.com/reference/clibrary/cmath/ceil.html

3.floor
http://www.cplusplus.com/reference/clibrary/cmath/floor.html


由于浮点误差，可能会出现比如x = 2.0000001的情况(准确值是2.0)，此时ceil(x)会返回3.0，需要用EPS修正
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