nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return next
floating-point number toward positive/negative infinity
#define _GNU_SOURCE /* See feature_test_macros(7) */
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);
Link with -lm
(), and nextupl
() functions return the
next representable floating-point number greater than 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.
is positive infinity, the returned value is positive infinity. If
is negative infinity, the returned value is the largest representable
finite negative number of the corresponding type.
is Nan, the returned value is NaN.
The value returned by nextdown(x)
, and similarly
for the other types.
These functions first appeared in glibc in version 2.24.
For an explanation of the terms used in this section, see attributes
|nextup (), nextupf (), nextupl (), nextdown (), nextdownf (), nextdownl
These functions are described in IEEE Std 754-2008 - Standard for
and ISO/IEC TS 18661