浮点或者双精度浮点的内存空间是限定了的，所以某些值不能被表示。
The memory space of a float or double value is limited, so some values cannot be represented.
这些类允许各种几何图形建立在双精度或浮点精度的坐标系上。
These classes allow the various geometric shapes to be constructed with coordinates of either double or float precision.
如果参数为0，则对应的浮点数和双精度数的结果分别是- 127和- 1023。
If the argument is zero, then the result will be -127 for a float and -1023 for a double.
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