1LRINT(3) Linux Programmer's Manual LRINT(3)
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6 lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest in‐
7 teger
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10 #include <math.h>
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12 long lrint(double x);
13 long lrintf(float x);
14 long lrintl(long double x);
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16 long long llrint(double x);
17 long long llrintf(float x);
18 long long llrintl(long double x);
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20 Link with -lm.
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22 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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24 All functions shown above:
25 _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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28 These functions round their argument to the nearest integer value, us‐
29 ing the current rounding direction (see fesetround(3)).
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31 Note that unlike the rint(3) family of functions, the return type of
32 these functions differs from that of their arguments.
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35 These functions return the rounded integer value.
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37 If x is a NaN or an infinity, or the rounded value is too large to be
38 stored in a long (long long in the case of the ll* functions), then a
39 domain error occurs, and the return value is unspecified.
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42 See math_error(7) for information on how to determine whether an error
43 has occurred when calling these functions.
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45 The following errors can occur:
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47 Domain error: x is a NaN or infinite, or the rounded value is too large
48 An invalid floating-point exception (FE_INVALID) is raised.
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50 These functions do not set errno.
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53 These functions first appeared in glibc in version 2.1.
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56 For an explanation of the terms used in this section, see at‐
57 tributes(7).
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59 ┌───────────────────────────────┬───────────────┬─────────┐
60 │Interface │ Attribute │ Value │
61 ├───────────────────────────────┼───────────────┼─────────┤
62 │lrint(), lrintf(), lrintl(), │ Thread safety │ MT-Safe │
63 │llrint(), llrintf(), llrintl() │ │ │
64 └───────────────────────────────┴───────────────┴─────────┘
66 C99, POSIX.1-2001, POSIX.1-2008.
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69 ceil(3), floor(3), lround(3), nearbyint(3), rint(3), round(3)
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72 This page is part of release 5.10 of the Linux man-pages project. A
73 description of the project, information about reporting bugs, and the
74 latest version of this page, can be found at
75 https://www.kernel.org/doc/man-pages/.
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79 2020-11-01 LRINT(3)