nextup(3) Library Functions Manual nextup(3)
NAME
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return next
floating-point number toward positive/negative infinity
LIBRARY
Math library (libm, -lm)
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <math.h>
double nextup(double x);
float nextupf(float x);
long double nextupl(long double x);
double nextdown(double x);
float nextdownf(float x);
long double nextdownl(long double x);
DESCRIPTION
The nextup(), nextupf(), and nextupl() functions return the next repre-
sentable floating-point number greater than x.
If x is the smallest representable negative number in the corresponding
type, these functions return -0. If x is 0, the returned value is the
smallest representable positive number of the corresponding type.
If x is positive infinity, the returned value is positive infinity. If
x is negative infinity, the returned value is the largest representable
finite negative number of the corresponding type.
If x is Nan, the returned value is NaN.
The value returned by nextdown(x) is -nextup(-x), and similarly for the
other types.
RETURN VALUE
See DESCRIPTION.
VERSIONS
These functions were added in glibc 2.24.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│nextup(), nextupf(), nextupl(), nextdown(), │ Thread safety │ MT-Safe │
│nextdownf(), nextdownl() │ │ │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
These functions are described in IEEE Std 754-2008 - Standard for
Floating-Point Arithmetic and ISO/IEC TS 18661.
SEE ALSO
nearbyint(3), nextafter(3)
Linux man-pages 6.03 2022-12-15 nextup(3)
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