man3/lrint.3

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  23 .TH LRINT 3  2007-07-26 "" "Linux Programmer's Manual"
  24 .SH NAME
  25 lrint, lrintf, lrintl, llrint, llrintf, llrintl \- round to nearest integer
  26 .SH SYNOPSIS
  27 .nf
  28 .B #include <math.h>
  29 .sp
  30 .BI "long int lrint(double " x );
  31 .br
  32 .BI "long int lrintf(float " x );
  33 .br
  34 .BI "long int lrintl(long double " x );
  35 .sp
  36 .BI "long long int llrint(double " x );
  37 .br
  38 .BI "long long int llrintf(float " x );
  39 .br
  40 .BI "long long int llrintl(long double " x );
  41 .fi
  42 .sp
  43 Link with \fI\-lm\fP.
  44 .sp
  45 .in -4n
  46 Feature Test Macro Requirements for glibc (see
  47 .BR feature_test_macros (7)):
  48 .in
  49 .sp
  50 .ad l
  51 All functions shown above:
  52 _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
  53 .I cc\ -std=c99
  54 .ad b
  55 .SH DESCRIPTION
  56 These functions round their argument to the nearest integer value,
  57 using the current rounding direction.
  58 If \fIx\fP is infinite or NaN, or if the rounded value is outside
  59 the range of the return type, the numeric result is unspecified.
  60 A domain error may occur if the magnitude of \fIx\fP is too large.
  61 .SH "RETURN VALUE"
  62 The rounded integer value.
  63 .SH ERRORS
  64 .TP
  65 .B EDOM
  66 The magnitude of \fIx\fP is too large and
  67 .I "(math_errhandling & MATH_ERRNO)"
  68 is nonzero.
  69 .SH "CONFORMING TO"
  70 C99.
  71 .SH "SEE ALSO"
  72 .BR ceil (3),
  73 .BR floor (3),
  74 .BR lround (3),
  75 .BR nearbyint (3),
  76 .BR rint (3),
  77 .BR round (3)