AThemATics> (IEEE 754) "IEEE Standard for Binary FloATing-Point Arithmetic (ANSI/IEEE Std 754-1985)" or IEC 559: "Binary floATing-point arithmetic for microprocessor systems". A standard, used by many CPUs 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)