Section (3) nextup
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl — return next floating-point number toward positive/negative infinity
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <math.h>
||long double x
||long double x
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
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.
x is Nan, the
returned value is NaN.
The value returned by
−nextup(−x), and similarly for
the other types.
For an explanation of the terms used in this section, see attributes(7).
These functions are described in IEEE Std 754-2008 - Standard for Floating-Point Arithmetic and ISO/IEC TS 18661.
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