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Re:pi ＝ 3.1415926535897932384626才过，精度令人发指

Posted by logics_space at 2009-10-31 23:25:30 on Problem 1347
In Reply To:pi ＝ 3.1415926535897932384626才过，精度令人发指 Posted by:logics_space at 2009-10-31 21:27:10

我错了,其实acos(-1.0) = 3.1415926535897931
            精确的PI = 3.1415926535897932 在double的有效位上只差别一位
acos(-1.0) 完全等于 atan(1.0)*4 
而这三种PI的表示方法都能过

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