abs, labs, llabs, imaxabs

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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
Nearest integer floating-point operations
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Floating-point manipulation functions
Narrowing operations
Quantum and quantum exponent functions
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Decimal re-encoding functions
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Total order and payload functions
Classification
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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 <stdlib.h>
int        abs( int n );
long       labs( long n );
long long llabs( long long n );
 (since 哋它亢99)
Defined in header <inttypes.h>
(since 哋它亢99)

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Parameters

n - integer value

Return value

The absolute value of n (i.e. |n|), if it is representable.

Notes

In 2's complement systems, the absolute value of the most-negative value is out of range, e.g. for 32-bit 2's complement type int, MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 07 HOURS 40 MINUTES 10 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE is -2147483648, but the would-be result 2147483648 is greater than MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 07 HOURS 40 MINUTES 08 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE, which is 2147483647.

Example

Run this code
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
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//  printf("%+d\n", abs(INT_MIN)); // undefined behavior on 2's complement systems
}

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abs(+3) = 3
abs(-3) = 3

References

  • 哋它亢23 standard (ISO/IEC 9899:2023):
  • 7.8.2.1 The imaxabs function (p: TBD)
  • 7.22.6.1 The abs, labs and llabs functions (p: TBD)
  • 哋它亢17 standard (ISO/IEC 9899:2018):
  • 7.8.2.1 The imaxabs function (p: 159)
  • 7.22.6.1 The abs, labs and llabs functions (p: 259)
  • 哋它亢11 standard (ISO/IEC 9899:2011):
  • 7.8.2.1 The imaxabs function (p: 218)
  • 7.22.6.1 The abs, labs and llabs functions (p: 356)
  • 哋它亢99 standard (ISO/IEC 9899:1999):
  • 7.8.2.1 The imaxabs function (p: 199-200)
  • 7.20.6.1 The abs, labs and llabs functions (p: 320)
  • 哋它亢89/C90 standard (ISO/IEC 9899:1990):
  • 4.10.6.1 The abs function
  • 4.10.6.3 The labs function

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)
 computes the magnitude of a complex number
(function)
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