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'''Double''' is a 64-bit data type representing the [https://en.wikipedia.org/wiki/Double_precision_floating-point_format double precision floating-point format], in [https://en.wikipedia.org/wiki/IEEE_754-1985 IEEE 754-1985] called double, in [https://en.wikipedia.org/wiki/IEEE_754-2008 IEEE 754-2008] 64-bit base 2 format is officially referred to as binary64. Due to [https://en.wikipedia.org/wiki/Normal_number_%28computing%29 normalization] the true [https://en.wikipedia.org/wiki/Significand significand] includes an implicit leading one bit unless the exponent is stored with all bits zeros or ones which are reserved for [https://en.wikipedia.org/wiki/Subnormal_numbers Denormal numbers]. Thus only 52 bits of the significand are stored but the total precision is 53 bits (≈15.955 decimal digits). [https://en.wikipedia.org/wiki/Exponent_bias Exponent bias] is 0x3FF (1023).

[[FILE:IEEE 754 Double Floating Point Format.svg|none|border|text-bottom]]

[https://en.wikipedia.org/wiki/Double_precision_floating-point_format Double precision floating-point format]