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Showing content from https://en.cppreference.com/w/cpp/algorithm/../algorithm/../../c/header/../numeric/math/abs.html below:

abs, labs, llabs, imaxabs - cppreference.com

int        abs( int n );

long       labs( long n );

long long llabs( long long n );

Computes the absolute value of an integer number. The behavior is undefined if the result cannot be represented by the return type.

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

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, INT_MIN is -2147483648, but the would-be result 2147483648 is greater than INT_MAX, which is 2147483647.

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
    printf("abs(+3) = %d\n", abs(+3));
    printf("abs(-3) = %d\n", abs(-3));
 
//  printf("%+d\n", abs(INT_MIN)); // undefined behavior on 2's complement systems
}

Output:

• C23 standard (ISO/IEC 9899:2024):

• 7.8.2.1 The imaxabs function (p: TBD)

• 7.22.6.1 The abs, labs and llabs functions (p: TBD)

• C17 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)

• C11 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)

• C99 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)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.10.6.1 The abs function

• 4.10.6.3 The labs function

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