Re: how long is double
From: Thomas Mang (a9804814_at_unet.univie.ac.at)
Date: 01/04/04
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Date: 4 Jan 2004 06:25:34 -0500
f schrieb:
> I have this
>
> double sum, a, b, c;
> sum = a + b + c;
> printf("%.20f = %.20f, %.20f, %.20f", sum, a, b, c);
>
> I found that the debug version and release version of the same code
> give me different result. I am using VC++ 6.0.
Your code yields undefined behavior, because sum, a, b and c have never
been initialized before using them for computations / printing.
So the outcome of the program is undefined, thus anything might happen -
and different outcome between debug and release version is just one
possibility.
regards,
Thomas
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