Section : 3 Updated : 2023-02-05 Source : Linux man-pages 6.03 NAMEnextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl − floating-point number manipulation LIBRARYMath library (libm, −lm)SYNOPSIS#include <math.h>double nextafter(double x, double y);
float nextafterf(float x, float y);
long double nextafterl(long double x, long double y);double nexttoward(double x, long double y);
float nexttowardf(float x, long double y);
long double nexttowardl(long double x, long double y);Feature Test Macro Requirements for glibc (see feature_test_macros(7)):nextafter(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| _XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEnextafterf(),nextafterl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEnexttoward(),nexttowardf(),nexttowardl(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE
|| _POSIX_C_SOURCE >= 200112LDESCRIPTIONThe nextafter(),nextafterf(), and nextafterl() functions return the next representable floating-point value following x in the direction of y. If y is less than x, these functions will return the largest representable number less than x.If x equals y, the functions return y.The nexttoward(),nexttowardf(), and nexttowardl() functions do the same as the corresponding nextafter() functions, except that they have a long double"second argument. RETURN VALUEOn success, these functions return the next representable floating-point value after x in the direction of y.If x equals y, then y (cast to the same type as x) is returned. If x or y is a NaN, a NaN is returned. If x is finite, and the result would overflow, a range error occurs, and the functions return HUGE_VAL,HUGE_VALF, or HUGE_VALL, respectively, with the correct mathematical sign. If x is not equal to y, and the correct function result would be subnormal, zero, or underflow, a range error occurs, and either the correct value (if it can be represented), or 0.0, is returned. ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Range error: result overflow errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised. Range error: result is subnormal or underflows errno is set to ERANGE. An underflow floating-point exception (FE_UNDERFLOW) is raised. ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
STANDARDSC99, POSIX.1-2001, POSIX.1-2008. This function is defined in IEC 559 (and the appendix with recommended functions in IEEE 754/IEEE 854). BUGSIn glibc 2.5 and earlier, these functions do not raise an underflow floating-point (FE_UNDERFLOW) exception when an underflow occurs. Before glibc 2.23 these functions did not set errno.SEE ALSOnearbyint(3)0 Johanes Gumabo Data Size : 14,658 byte man-nexttowardl.3Build : 2025-03-22, 13:26 : Visitor Screen : x Visitor Counter ( page / site ) : 30 / 2,230,678 Visitor ID : : Visitor IP : 216.73.216.247 : Visitor Provider : AMAZON-02 : Provider Position ( lat x lon ) : 39.962500 x -83.006100 : x Provider Accuracy Radius ( km ) : 20 : Provider City : Columbus : Provider Province : Ohio , : , Provider Country : United States : Provider Continent : North America : Visitor Recorder : Version : Visitor Recorder : Library : Online Linux Manual Page : Version : Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 25.03.22 Online Linux Manual Page : Library : lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Online Linux Manual Page : Library : lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Data Base : Version : Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38 Data Base : Library : lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36
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