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Re: [Bug-glpk] 0 ** 0; result undefined
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From: |
Andrew Makhorin |
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Subject: |
Re: [Bug-glpk] 0 ** 0; result undefined |
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Date: |
Sun, 9 Nov 2008 05:31:30 +0300 |
> According to ISO/IEC 9899:TC2 (ISO C99)
> A domain error may occur if x is zero and y is zero. (in function pow).
This standard also says (see subsection F.9.4.4, page 460):
pow(x, 0) returns 1 for any x, even a NaN.
However, this does not mean that the GNU MathProg must follow the same
convention :)
> Obviously this is implementation dependent.
> Hence the code in fp_power has to check to be compatible with different
> C compilers.
It does check.