*nan-single*

This constant has the value of IEEE single-float NaN (Not-a-Number). It is a legal floating-point value. In arithmetic operations, it produces NaNs of appropriate format (following standard floating-point coercion rules) in all cases. See the linked discussion for more details.

NaNs like this one can result from normal arithmetic operations, such zero divided by zero in a function with types declared and compiled so comp:trust-declarations-switch is true, but that same call run interpreted may instead signal an error.

See Floating-point infinities and NaNs, and floating-point underflow and overflow in implementation.htm. Also see *negative-infinity-single*, *infinity-double*, *infinity-single*, *negative-infinity-double*, and *nan-double*.

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Documentation for Allegro CL version 8.1. This page is new in the 8.1 release.
Created 2007.4.30.