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nextup(3) Library Functions Manual nextup(3)
nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return next floating-point number toward positive/negative infinity
Math library (libm, -lm)
#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);
The nextup(), nextupf(), and nextupl() functions return the next representable 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.
See DESCRIPTION.
For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────────────────┬───────────────┬─────────┐ │ Interface │ Attribute │ Value │ ├─────────────────────────────────────┼───────────────┼─────────┤ │ nextup(), nextupf(), nextupl(), │ Thread safety │ MT-Safe │ │ nextdown(), nextdownf(), │ │ │ │ nextdownl() │ │ │ └─────────────────────────────────────┴───────────────┴─────────┘
These functions are described in IEEE Std 754-2008 - Standard for Floating-Point Arithmetic and ISO/IEC TS 18661.
glibc 2.24.
nearbyint(3), nextafter(3)
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Linux man-pages 6.9.1 2024-05-02 nextup(3)