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 Doubleprecision floatingpoint format is a computer number format, usually occupying 64 bits in computer memory; it represents a wide dynamic range of numeric values by using a floating radix point. Floating point is used to represent fractional values, or when a wider range is needed than is provided by fixed point (of the same bit width), even if at the cost of precision. Double precision may be chosen when the range or precision of single precision would be insufficient. In the IEEE 7542008 standard, the 64bit base2 format is officially referred to as binary64; it was called double in IEEE 7541985. IEEE 754 specifies additional floatingpoint formats, including 32bit base2 single precision and, more recently, base10 representations. One of the first programming languages to provide single and doubleprecision floatingpoint data types was Fortran. Before the widespread adoption of IEEE 7541985, the representation and properties of floatingpoint data types depended on the computer manufacturer and computer model, and upon decisions made by programminglanguage implementers. E.g., GWBASIC's doubleprecision data type was the 64bit MBF floatingpoint format. (en)

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 Doubleprecision floatingpoint format is a computer number format, usually occupying 64 bits in computer memory; it represents a wide dynamic range of numeric values by using a floating radix point. Floating point is used to represent fractional values, or when a wider range is needed than is provided by fixed point (of the same bit width), even if at the cost of precision. Double precision may be chosen when the range or precision of single precision would be insufficient. (en)

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 Doubleprecision floatingpoint format (en)

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