双精度浮点数格式,即IEEE 754标准 >>> 0.1+0.2 0.30000000000000004 >>> (0.1+0.2)==0.3 False >>> 相关文章: 2021-09-18 2021-07-07 2022-01-17 2021-12-25 2022-12-23 2022-01-01 2022-12-23