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当我想输出一个4.999999999999999999999超过双精度（15位）的double（或float）数字时，double5.000000000000000的结果是，float的结果是5.000000。
4.999999999999999999999
5.000000000000000
5.000000
如何在不丢失精度的情况下打印原始数字？