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LLROUND(P)POSIX Programmer's Manual LLROUND(P)NAMEllround, llroundf, llroundl - round to nearest integer valueSYNOPSIS#include <math.h> long long llround(double x); long long llroundf(float x); long long llroundl(long double x);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 set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is non- zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.RETURN VALUEUpon successful completion, these functions shall return the rounded integer value. If x is NaN, a domain error shall occur, and an unspecified value is returned. If x is +Inf, a domain error shall occur and an unspecified value is returned. If x is, a domain error shall occur and an unspecified value is returned. If the correct value is positive and too large to represent as a long long, a domain error shall occur and an unspecified value is returned. If the correct value is negative and too large to represent as a long long, a domain error shall occur and an unspecified value is returned.-InfERRORSThese functions shall fail if: Domain Error The x argument 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, then errno shall be set to [EDOM]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception shall be raised. The following sections are informative.EXAMPLESNone.APPLICATION USAGEOn error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero.RATIONALEThese functions differ from the llrint() functions in that the default rounding direction for the llround() functions round halfway cases away from zero and need not raise the inexact floating-point exception for non-integer arguments that round to within the range of the return type.FUTURE DIRECTIONSNone.SEE ALSOfeclearexcept() , fetestexcept() , lround() , the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Func- tions, <math.h>COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information TechnologyPortable Operating System Interface (POSIX), The Open Group Base Specifications 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 Standard, the original IEEE and The Open Group Standard is the referee document. The orig- inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .--IEEE/The Open Group 2003 LLROUND(P)

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