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)，依此類推。對於雙精度浮點數，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.
其中一個搆造函數以雙精度浮點數作爲輸入，另一個以整數和換算因子作爲輸入，還有一個以小數的 String 表示作爲輸入。
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 類型也可以表示爲 DOUBLE PRECISION，雖然爲什麽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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