Is there an "error value" I can use for a double?

[indigo0086]

I'm doing an algorithm that returns a double if the value is proper, is there a constant I can use to indicate the value is an error. The numbers that do properly return can be negative or positive so -1's out. Is there a system independent value that indicates a bad double value?

[matsp]

NaN? (Not a number)

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Mats

[indigo0086]

hmm, how about that. Thanks.

[brewbuck]

I'm doing an algorithm that returns a double if the value is proper, is there a constant I can use to indicate the value is an error. The numbers that do properly return can be negative or positive so -1's out. Is there a system independent value that indicates a bad double value?

Why not throw an exception?