double-precision

基本解釋

For double-precision floating point, 11 bits are dedicated to the exponent and 52 bits to the mantissa.
(2 -2)，依此類推。對于雙精度浮點數，用 11 位表示指數，52 位表示尾數。
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.
其中一個構造函數以雙精度浮點數作為輸入，另一個以整數和換算因子作為輸入，還有一個以小數的 String 表示作為輸入。
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 類型也可以表示為 DOUBLE PRECISION，雖然為什么在需要雙精度數字時要輸入額外的單詞，原因不明。

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