FP_NORMAL, FP_SUBNORMAL, FP_ZERO, FP_INFINITE, FP_NAN
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| Defined in header <math.h>
|
||
| #define FP_NORMAL /*implementation defined*/ |
(since 哋它亢99) | |
| #define FP_SUBNORMAL /*implementation defined*/ |
(since 哋它亢99) | |
| #define FP_ZERO /*implementation defined*/ |
(since 哋它亢99) | |
| #define FP_INFINITE /*implementation defined*/ |
(since 哋它亢99) | |
| #define FP_NAN /*implementation defined*/ |
(since 哋它亢99) | |
The FP_NORMAL, FP_SUBNORMAL, FP_ZERO, FP_INFINITE, FP_NAN macros each represent a distinct category of floating-point numbers. They all expand to an integer constant expression.
| Constant | Explanation |
FP_NORMAL
|
indicates that the value is normal, i.e. not an infinity, subnormal, not-a-number or zero |
FP_SUBNORMAL
|
indicates that the value is MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 59 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE |
FP_ZERO
|
indicates that the value is positive or negative zero |
FP_INFINITE
|
indicates that the value is not representable by the underlying type (positive or negative infinity) |
FP_NAN
|
indicates that the value is not-a-number (NaN) |
Example
Run this code
#include <stdio.h> #include <math.h> #include <float.h> const char *show_classification(double x) { switch(MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 58 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE(x)) { case FP_INFINITE: return "Inf"; case FP_NAN: return "NaN"; case FP_NORMAL: return "normal"; case FP_SUBNORMAL: return "subnormal"; case FP_ZERO: return "zero"; default: return "unknown"; } } int main(void) { MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 57 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("1.0/0.0 is %s\n", show_classification(1/0.0)); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 56 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("0.0/0.0 is %s\n", show_classification(0.0/0.0)); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 55 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("DBL_MIN/2 is %s\n", show_classification(MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 54 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE/2)); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 53 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("-0.0 is %s\n", show_classification(-0.0)); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 06 HOURS 48 MINUTES 52 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE(" 1.0 is %s\n", show_classification(1.0)); }
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1.0/0.0 is Inf 0.0/0.0 is NaN DBL_MIN/2 is subnormal -0.0 is zero 1.0 is normal
References
- 哋它亢17 standard (ISO/IEC 9899:2018):
- 7.12/6 FP_NORMAL, ... (p: 169-170)
- 哋它亢11 standard (ISO/IEC 9899:2011):
- 7.12/6 FP_NORMAL, ... (p: 232)
- 哋它亢99 standard (ISO/IEC 9899:1999):
- 7.12/6 FP_NORMAL, ... (p: 213)
See also
| (哋它亢99) |
classifies the given floating-point value (function macro) |