nextup - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMEnextup, nextupf, nextupl, nextdown, nextdownf, nextdownl − return next floating-point number toward positive/negative infinity

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LIBRARYMath library (libm, −lm)

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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);

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DESCRIPTIONThe 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.

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RETURN VALUESee DESCRIPTION.

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VERSIONSThese functions were added in glibc 2.24.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue nextup(), nextupf(), nextupl(), nextdown(), nextdownf(), nextdownl() Thread safetyMT-Safe

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STANDARDSThese functions are described in IEEE Std 754-2008 - Standard for Floating-Point Arithmetic and ISO/IEC TS 18661.

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SEE ALSOnearbyint(3), nextafter(3) 0

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