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LROUND(3P) POSIX Programmer's Manual LROUND(3P)PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may dif- fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.NAMElround, lroundf, lroundl - round to nearest integer valueSYNOPSIS#include<math.h>longlround(doublex);longlroundf(floatx);longlroundl(longdoublex);DESCRIPTIONThese functions shall round their argument to the nearest integer value, rounding halfway cases away from zero, regardless of the current rounding direction. An application wishing to check for error situations should seterrnoto zero and callfeclearex-cept(FE_ALL_EXCEPT) before calling these functions. On return, iferrnois non-zero orfetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.RETURNVALUEUpon successful completion, these functions shall return the rounded integer value. Ifxis NaN, a domain error shall occur and an unspecified value is returned. Ifxis +Inf, a domain error shall occur and an unspecified value is returned. Ifxis -Inf, a domain error shall occur and an unspecified value is returned. If the correct value is positive and too large to represent as along, a domain error shall occur and an unspecified value is returned. If the correct value is negative and too large to represent as along, a domain error shall occur and an unspecified value is returned.ERRORSThese functions shall fail if: Domain Error Thexargument is NaN or ?Inf, or the correct value is not representable as an integer. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, thenerrnoshall be set to [EDOM]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point excep- tion shall be raised.Thefollowingsectionsareinformative.EXAMPLESNone.APPLICATIONUSAGEOn error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are indepen- dent of each other, but at least one of them must be non-zero.RATIONALEThese functions differ from thelrint() functions in the default rounding direction, with thelround() func- tions rounding halfway cases away from zero and needing not to raise the inexact floating-point exception for non-integer arguments that round to within the range of the return type.FUTUREDIRECTIONSNone.SEEALSOfeclearexcept(),fetestexcept(),llround(), the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Functions,<math.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan- dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica- tions Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan- dard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE/The Open Group 2003 LROUND(3P)