'\" te .\" Copyright (c) 2001, the Institute of Electrical and Electronics Engineers, Inc. and The Open Group. All Rights Reserved. .\" Portions Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved. .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at http://www.opengroup.org/bookstore/. .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, 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. This notice shall appear on any product containing this material. .TH llround 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions" .SH NAME llround, llroundf, llroundl \- round to nearest integer value .SH SYNOPSIS .LP .nf c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ] #include \fBlong long\fR \fBllround\fR(\fBdouble\fR \fIx\fR); .fi .LP .nf \fBlong long\fR \fBllroundf\fR(\fBfloat\fR \fIx\fR); .fi .LP .nf \fBlong long\fR \fBllroundl\fR(\fBlong double\fR \fIx\fR); .fi .SH DESCRIPTION .sp .LP These functions rounds their argument to the nearest integer value, rounding halfway cases away from 0 regardless of the current rounding direction. .SH RETURN VALUES .sp .LP Upon successful completion, these functions return the rounded integer value. .sp .LP If \fIx\fR is NaN, a domain error occurs and an unspecified value is returned. .sp .LP If \fIx\fR is +Inf, a domain error occurs and an unspecified value is returned. .sp .LP If \fIx\fR is -Inf, a domain error occurs and an unspecified value is returned. .sp .LP If the correct value is positive and too large to represent as a \fBlong long\fR, a domain error occurs and an unspecified value is returned. .sp .LP If the correct value is negative and too large to represent as a \fBlong long\fR, a domain error occurs and an unspecified value is returned. .SH ERRORS .sp .LP These functions will fail if: .sp .ne 2 .mk .na \fBDomain Error\fR .ad .RS 16n .rt The \fIx\fR argument is NaN or \(+-Inf, or the correct value is not representable as an integer. .sp If the integer expression (\fBmath_errhandling\fR & \fBMATH_ERREXCEPT\fR) is non-zero, then the invalid floating-point exception will be raised. .RE .SH USAGE .sp .LP An application wanting to check for exceptions should call \fBfeclearexcept\fR(\fBFE_ALL_EXCEPT\fR) before calling these functions. On return, if \fBfetestexcept\fR(\fBFE_INVALID\fR | \fBFE_DIVBYZERO\fR | \fBFE_OVERFLOW\fR | \fBFE_UNDERFLOW\fR) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions. .sp .LP These functions differ from the \fBllrint\fR(3M) functions in that the default rounding direction for the \fBllround()\fR functions round halfway cases away from 0 and need not raise the inexact floating-point exception for non-integer arguments that round to within the range of the return type. .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) . ATTRIBUTE TYPEATTRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ StandardSee \fBstandards\fR(5). .TE .SH SEE ALSO .sp .LP \fBfeclearexcept\fR(3M), \fBfetestexcept\fR(3M), \fBllrint\fR(3M), \fBlrint\fR(3M), \fBlround\fR(3M), \fBmath.h\fR(3HEAD), \fBattributes\fR(5), \fBstandards\fR(5)