lrintf(3)

1lrint(3)                   Library Functions Manual                   lrint(3)
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NAME

6       lrint,  lrintf, lrintl, llrint, llrintf, llrintl - round to nearest in‐
7       teger
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LIBRARY

10       Math library (libm, -lm)
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SYNOPSIS

13       #include <math.h>
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15       long lrint(double x);
16       long lrintf(float x);
17       long lrintl(long double x);
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19       long long llrint(double x);
20       long long llrintf(float x);
21       long long llrintl(long double x);
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23   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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25       All functions shown above:
26           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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DESCRIPTION

29       These functions round their argument to the nearest integer value,  us‐
30       ing the current rounding direction (see fesetround(3)).
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32       Note  that  unlike  the rint(3) family of functions, the return type of
33       these functions differs from that of their arguments.
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RETURN VALUE

36       These functions return the rounded integer value.
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38       If x is a NaN or an infinity, or the rounded value is too large  to  be
39       stored  in  a long (long long in the case of the ll* functions), then a
40       domain error occurs, and the return value is unspecified.
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ERRORS

43       See math_error(7) for information on how to determine whether an  error
44       has occurred when calling these functions.
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46       The following errors can occur:
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48       Domain error: x is a NaN or infinite, or the rounded value is too large
49              An invalid floating-point exception (FE_INVALID) is raised.
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51       These functions do not set errno.
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ATTRIBUTES

54       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
55       tributes(7).
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57       ┌────────────────────────────────────────────┬───────────────┬─────────┐
58       │Interface                                   │ Attribute     │ Value   │
59       ├────────────────────────────────────────────┼───────────────┼─────────┤
60       │lrint(), lrintf(), lrintl(), llrint(),      │ Thread safety │ MT-Safe │
61       │llrintf(), llrintl()                        │               │         │
62       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

65       C11, POSIX.1-2008.
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HISTORY

68       glibc 2.1.  C99, POSIX.1-2001.
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