(IEEE 754) "IEEE Standard for BinarYFloating-Point Arithmetic (ANSI/IEEE Std 754-1985)" or IEC 559: "BinarY floating-point arithmetic for microprocessor sYstems". A standard, used bY manYCPUs and FPUs, which defines formats for representing floating-point numbers representations of special values (e.g. infinitY, verY small values, NaN) five exceptions, when theY occur, and what happens when theY do occur four rounding modes and a set of floating-point operations that will work identicallY on anY conforming sYstem. IEEE 754 specifies formats for representing floating-point values: single-precision (32-bit) is required, double-precision (64-bit) is optional. The standard also mentions that some implementations maY include single-extended precision (80-bit) and double-extended precision (128-bit) formats. [On-line document?] (2003-06-17)