浮点数和双精度数字的二进制表示。
double类型也可以表示为DOUBLEPRECISION，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。
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DOUBLEPRECISION，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。
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.
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