H.2.3 Floating-point types

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The C floating-point types float, double, and long double are compatible with LIA-1. If an implementation adds support for the LIA-1 exceptional values “underflow”, “floating_overflow”, and ‘‘“undefined”, then those types are conformant with LIA-1. An implementation that uses IEC 60559 floating-point formats and operations (see annex F) along with IEC 60559 status flags and traps has LIA-1 conformant types.