NEXTAFTER(3) | Linux Programmer's Manual | NEXTAFTER(3) |
NAME
nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl - floating-point number manipulationSYNOPSIS
#include <math.h>Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The nextafter() functions return the next representable floating-point value following x in the direction of y. If y is less than x, these functions will return the largest representable number less than x.RETURN VALUE
On success, these functions return the next representable floating-point value after x in the direction of y.ERRORS
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.The following errors can occur:
- Range error: result overflow
- An overflow floating-point exception ( FE_OVERFLOW) is raised.
- Range error: result is subnormal or underflows
- An underflow floating-point exception ( FE_UNDERFLOW) is raised.
These functions do not set errno.
CONFORMING TO
C99, POSIX.1-2001. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854).BUGS
In glibc version 2.5 and earlier, these functions do not raise an underflow floating-point ( FE_UNDERFLOW) exception when an underflow occurs.SEE ALSO
nearbyint(3)COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.2010-09-20 | GNU |