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Programming-Idioms

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Idiom #285 Set variable to NaN

Given two floating point variables a and b, set a to a to a quiet NaN and b to a signalling NaN. Use standard features of the language only, without invoking undefined behavior.

    use, intrinsic :: ieee_arithmetic, only: IEEE_Value, IEEE_QUIET_NAN, IEEE_SIGNALING_NAN
 a = ieee_value (a, IEEE_QUIET_NAN)
 b = ieee_value (b, IEEE_SIGNALING_NAN)
math
a := NaN;
a = float('nan')
a = Float::NAN
let a: f64 = f64::NAN;

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tkoenig