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AT&T 3B computer systems included the 3B2, 3B5, 3B15, 3B20S, and 3B4000. These computers were named after the successful 3B20D. The 3B20S (simplex) ran using the UNIX operating system and was developed at Bell Labs and produced by WECo in 1982 for the general purpose internal Bell System use, and later the mini-computer market.
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lrint(3) [linux man page]

LRINT(3)						     Linux Programmer's Manual							  LRINT(3)

NAME
lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest integer SYNOPSIS
#include <math.h> long int lrint(double x); long int lrintf(float x); long int lrintl(long double x); long long int llrint(double x); long long int llrintf(float x); long long int llrintl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION
These functions round their argument to the nearest integer value, using the current rounding direction (see fesetround(3)). Note that unlike rint(3), etc., the return type of these functions differs from that of their arguments. RETURN VALUE
These functions return the rounded integer value. If x is a NaN or an infinity, or the rounded value is too large to be stored in a long (long long in the case of the ll* functions) then a domain error occurs, and the return value is unspecified. ERRORS
See math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is a NaN or infinite, or the rounded value is too large An invalid floating-point exception (FE_INVALID) is raised. These functions do not set errno. VERSIONS
These functions first appeared in glibc in version 2.1. CONFORMING TO
C99, POSIX.1-2001. SEE ALSO
ceil(3), floor(3), lround(3), nearbyint(3), rint(3), round(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2010-09-20 LRINT(3)

Check Out this Related Man Page

LRINT(3)						     Linux Programmer's Manual							  LRINT(3)

NAME
lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest integer SYNOPSIS
#include <math.h> long int lrint(double x); long int lrintf(float x); long int lrintl(long double x); long long int llrint(double x); long long int llrintf(float x); long long int llrintl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION
These functions round their argument to the nearest integer value, using the current rounding direction (see fesetround(3)). Note that unlike rint(3), etc., the return type of these functions differs from that of their arguments. RETURN VALUE
These functions return the rounded integer value. If x is a NaN or an infinity, or the rounded value is too large to be stored in a long (long long in the case of the ll* functions) then a domain error occurs, and the return value is unspecified. ERRORS
See math_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error: x is a NaN or infinite, or the rounded value is too large An invalid floating-point exception (FE_INVALID) is raised. These functions do not set errno. VERSIONS
These functions first appeared in glibc in version 2.1. CONFORMING TO
C99, POSIX.1-2001. SEE ALSO
ceil(3), floor(3), lround(3), nearbyint(3), rint(3), round(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2010-09-20 LRINT(3)

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