F.9.6.3 The nearbyint functions

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The nearbyint functions use IEC 60559 rounding according to the current rounding direction. They do not raise the “inexact” floating-point exception if the result differs in value from the argument.

• nearbyint((+-)0) returns (+-)0 (for all rounding directions).

• nearbyint((+-)(inf)) returns (+-)(inf) (for all rounding directions).