double-precision

基本解释

For double-precision floating point, 11 bits are dedicated to the exponent and 52 bits to the mantissa.
(2 -2)，依此类推。对于双精度浮点数，用 11 位表示指数，52 位表示尾数。
One takes a double-precision floating point as input, another takes an integer and a scale factor, and another takes a String representation of a decimal number.
其中一个构造函数以双精度浮点数作为输入，另一个以整数和换算因子作为输入，还有一个以小数的 String 表示作为输入。
The DOUBLE type can also be referred to as DOUBLE PRECISION, although it isn't clear why you would want to type the extra word every time you need a double-precision number.
DOUBLE 类型也可以表示为 DOUBLE PRECISION，虽然为什么在需要双精度数字时要输入额外的单词，原因不明。

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