Fortran double precision8/29/2023 ![]() E.g., GW-BASIC's double-precision data type was the 64-bit MBF floating-point format. Before the widespread adoption of IEEE 754-1985, the representation and properties of floating-point data types depended on the computer manufacturer and computer model, and upon decisions made by programming-language implementers. One of the first programming languages to provide single- and double-precision floating-point data types was Fortran. IEEE 754 specifies additional floating-point formats, including 32-bit base-2 single precision and, more recently, base-10 representations. In the IEEE 754-2008 standard, the 64-bit base-2 format is officially referred to as binary64 it was called double in IEEE 754-1985. Double precision may be chosen when the range or precision of single precision would be insufficient. Double-precision floating-point format (sometimes called FP64 or float64) is a floating-point number format, usually occupying 64 bits in computer memory it represents a wide dynamic range of numeric values by using a floating radix point.įloating 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.
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