Last change
on this file since 388 was 388, checked in by coas-nagasima, 5 years ago |
Azure IoT Hub Device C SDK を使ったサンプルの追加
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Property svn:eol-style
set to
native
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Property svn:keywords
set to
Id
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Property svn:mime-type
set to
text/x-csrc
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File size:
228 bytes
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[388] | 1 | #include <math.h>
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| 2 |
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| 3 | /*
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| 4 | special cases:
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| 5 | logb(+-0) = -inf, and raise divbyzero
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| 6 | logb(+-inf) = +inf
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| 7 | logb(nan) = nan
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| 8 | */
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| 9 |
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| 10 | double logb(double x)
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| 11 | {
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| 12 | if (!isfinite(x))
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| 13 | return x * x;
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| 14 | if (x == 0)
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| 15 | return -1/(x*x);
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| 16 | return ilogb(x);
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| 17 | }
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