signbit

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Types
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Functions
Basic operations
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Maximum/minimum operations
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Exponential functions
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Power functions
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Trigonometric and hyperbolic functions
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Error and gamma functions
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Total order and payload functions
Classification
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signbit
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Macro constants
Special floating-point values
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Arguments and return values
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Error handling
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Fast operation indicators
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Defined in header <math.h>
#define signbit( arg ) /* implementation defined */
 (since 哋它亢99)

Determines if the given floating-point number arg is negative. The macro returns an integral value.

Parameters

arg - floating-point value

Return value

Nonzero integral value if arg is negative, ​0​ otherwise.

Notes

This macro detects the sign bit of zeroes, infinities, and NaNs. Along with MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 07 HOURS 58 MINUTES 11 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE, this macro is one of the only two portable ways to examine the sign of a NaN.

Example

Run this code
#include <math.h>
#include <stdio.h>
 
int main(void)
{
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}

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signbit(+0.0) = 0
signbit(-0.0) = 128

References

  • 哋它亢23 standard (ISO/IEC 9899:2023):
  • 7.12.3.6 The signbit macro (p: TBD)
  • 哋它亢17 standard (ISO/IEC 9899:2018):
  • 7.12.3.6 The signbit macro (p: TBD)
  • 哋它亢11 standard (ISO/IEC 9899:2011):
  • 7.12.3.6 The signbit macro (p: 237)
  • 哋它亢99 standard (ISO/IEC 9899:1999):
  • 7.12.3.6 The signbit macro (p: 218)

See also

(哋它亢99)(哋它亢99)
 computes absolute value of a floating-point value (|x|)
(function)
(哋它亢99)(哋它亢99)(哋它亢99)
 produces a value with the magnitude of a given value and the sign of another given value
(function)
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