QABS(3) BSD Library Functions Manual QABS(3)NAME
qabs -- return the absolute value of a quad integer
Standard C Library (libc, -lc)
The qabs() function returns the absolute value of the quad integer j.
SEE ALSO abs(3), cabs(3), floor(3), imaxabs(3), labs(3), llabs(3), math(3)BUGS
The absolute value of the most negative integer remains negative.
BSD June 29, 1991 BSD
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ABS(3) Linux Programmer's Manual ABS(3)NAME
abs, labs, llabs, imaxabs - compute the absolute value of an integer.
int abs(int j);
long int labs(long int j);
long long int llabs(long long int j);
intmax_t imaxabs(intmax_t j);
The abs() function computes the absolute value of the integer argument j. The labs(), llabs() and imaxabs() functions compute the absolute
value of the argument j of the appropriate integer type for the function.
Returns the absolute value of the integer argument, of the appropriate integer type for the function.
SVID 3, POSIX.1, BSD 4.3, ISO/IEC 9899 (C99). POSIX.1 (1996 edition) only requires the abs() function. ISO/IEC 9899:1990 (C89) only
includes the abs() and labs() functions; the functions llabs() and imaxabs() were added in C99.
Trying to take the absolute value of the most negative integer is not defined.
The llabs() function is included in glibc since version 2.0, but is not in libc5 or libc4. The imaxabs() function is included in glibc
since version 2.1.1.
For llabs() to be declared, it may be necessary to define _ISOC99_SOURCE or _ISOC9X_SOURCE (depending on the version of glibc) before
including any standard headers.
GCC handles abs() and labs() as builtin functions. GCC 3.0 also handles llabs() and imaxabs() as builtins.
SEE ALSO ceil(3), floor(3), fabs(3), rint(3)GNU 2000-12-17 ABS(3)
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