rint(3) Library Functions Manual rint(3) nearbyint nearbyintf nearbyintl rint rintf rintl - (libm -lm) #include double nearbyint(double x); float nearbyintf(float x); long double nearbyintl(long double x); double rint(double x); float rintf(float x); long double rintl(long double x); glibc ( feature_test_macros(7)): nearbyint() nearbyintf() nearbyintl(): _POSIX_C_SOURCE >= 200112L || _ISOC99_SOURCE rint(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 500 || /* glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE rintf() rintl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE nearbyint() nearbyintf() nearbyintl() ( fesetround(3)) inexact. IEEE-754. rint() rintf() rintl() inexact (FE_INEXACT fetestexcept(3)) . . x +0 -0 NaN x . . attributes(7). +------------+------------------------------------+--------------------+ || | | +------------+------------------------------------+--------------------+ |nearbyint(),| | MT-Safe | |nearbyintf(),| | | |nearbyintl(),| | | |rint(), | | | |rintf(), | | | |rintl() | | | +------------+------------------------------------+--------------------+ C11, POSIX.1-2008. C99 POSIX.1-2001. SUSv2 POSIX.1-2001 ( errno ERANGE FE_OVERFLOW). . ( . IEEE-754 32 64 127 ( 1023) 24 ( 53)). POSIX.1-2008. lrint(3) . ceil(3) floor(3) lrint(3) round(3) trunc(3) 3 . . : . 6.18 8 2026 rint(3)