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Showing content from http://en.cppreference.com/w/c/numeric/math/../../io/../numeric/math/rint.html below:

rint, rintf, rintl, lrint, lrintf, lrintl, llrint, llrintf, llrintl

float rintf( float arg );

double rint( double arg );

long double rintl( long double arg );

#define rint( arg )

long lrintf( float arg );

long lrint( double arg );

long lrintl( long double arg );

#define lrint( arg )

long long llrintf( float arg );

long long llrint( double arg );

long long llrintl( long double arg );

#define llrint( arg )

1-3) Rounds the floating-point argument arg to an integer value in floating-point format, using the current rounding mode.

5-7, 9-11) Rounds the floating-point argument arg to an integer value in integer format, using the current rounding mode.

4,8,12) Type-generic macros: If arg has type long double, rintl, lrintl, llrintl is called. Otherwise, if arg has integer type or the type double, rint, lrint, llrint is called. Otherwise, rintf, lrintf, llrintf is called, respectively.

If no errors occur, the nearest integer value to arg, according to the current rounding mode, is returned.

Errors are reported as specified in math_errhandling.

If the result of lrint or llrint is outside the range representable by the return type, a domain error or a range error may occur.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

For the rint function:

• If arg is ±∞, it is returned, unmodified.
• If arg is ±0, it is returned, unmodified.
• If arg is NaN, NaN is returned.

For lrint and llrint functions:

• If arg is ±∞, FE_INVALID is raised and an implementation-defined value is returned.
• If the result of the rounding is outside the range of the return type, FE_INVALID is raised and an implementation-defined value is returned.
• If arg is NaN, FE_INVALID is raised and an implementation-defined value is returned.

POSIX specifies that all cases where lrint or llrint raise FE_INEXACT are domain errors.

As specified in math_errhandling, FE_INEXACT may be (but isn't required to be on non-IEEE floating-point platforms) raised by rint when rounding a non-integer finite value.

The only difference between rint and nearbyint is that nearbyint never raises FE_INEXACT.

The largest representable floating-point values are exact integers in all standard floating-point formats, so rint never overflows on its own; however the result may overflow any integer type (including intmax_t), when stored in an integer variable.

If the current rounding mode is...

• FE_DOWNWARD, then rint is equivalent to floor.
• FE_UPWARD, then rint is equivalent to ceil.
• FE_TOWARDZERO, then rint is equivalent to trunc
• FE_TONEAREST, then rint differs from round in that halfway cases are rounded to even rather than away from zero.

#include <fenv.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
 
int main(void)
{
#pragma STDC FENV_ACCESS ON
    fesetround(FE_TONEAREST);
    printf("rounding to nearest (halfway cases to even):\n"
           "rint(+2.3) = %+.1f  ", rint(2.3));
    printf("rint(+2.5) = %+.1f  ", rint(2.5));
    printf("rint(+3.5) = %+.1f\n", rint(3.5));
    printf("rint(-2.3) = %+.1f  ", rint(-2.3));
    printf("rint(-2.5) = %+.1f  ", rint(-2.5));
    printf("rint(-3.5) = %+.1f\n", rint(-3.5));
 
    fesetround(FE_DOWNWARD);
    printf("rounding down: \nrint(+2.3) = %+.1f  ", rint(2.3));
    printf("rint(+2.5) = %+.1f  ", rint(2.5));
    printf("rint(+3.5) = %+.1f\n", rint(3.5));
    printf("rint(-2.3) = %+.1f  ", rint(-2.3));
    printf("rint(-2.5) = %+.1f  ", rint(-2.5));
    printf("rint(-3.5) = %+.1f\n", rint(-3.5));
    printf("rounding down with lrint: \nlrint(+2.3) = %ld  ", lrint(2.3));
    printf("lrint(+2.5) = %ld  ", lrint(2.5));
    printf("lrint(+3.5) = %ld\n", lrint(3.5));
    printf("lrint(-2.3) = %ld  ", lrint(-2.3));
    printf("lrint(-2.5) = %ld  ", lrint(-2.5));
    printf("lrint(-3.5) = %ld\n", lrint(-3.5));
 
    printf("lrint(-0.0) = %ld\n", lrint(-0.0));
    printf("lrint(-Inf) = %ld\n", lrint(-INFINITY)); // FE_INVALID raised
 
    // error handling
    feclearexcept(FE_ALL_EXCEPT);
    printf("rint(1.1) = %.1f\n", rint(1.1));
    if (fetestexcept(FE_INEXACT))
        puts("    FE_INEXACT was raised");
 
    feclearexcept(FE_ALL_EXCEPT);
    printf("lrint(LONG_MIN-2048.0) = %ld\n", lrint(LONG_MIN-2048.0));
    if (fetestexcept(FE_INVALID))
        puts("    FE_INVALID was raised");
}

Possible output:

rounding to nearest (halfway cases to even):
rint(+2.3) = +2.0  rint(+2.5) = +2.0  rint(+3.5) = +4.0
rint(-2.3) = -2.0  rint(-2.5) = -2.0  rint(-3.5) = -4.0
rounding down:
rint(+2.3) = +2.0  rint(+2.5) = +2.0  rint(+3.5) = +3.0
rint(-2.3) = -3.0  rint(-2.5) = -3.0  rint(-3.5) = -4.0
rounding down with lrint:
lrint(+2.3) = 2  lrint(+2.5) = 2  lrint(+3.5) = 3
lrint(-2.3) = -3  lrint(-2.5) = -3  lrint(-3.5) = -4
lrint(-0.0) = 0
lrint(-Inf) = -9223372036854775808
rint(1.1) = 1.0
    FE_INEXACT was raised
lrint(LONG_MIN-2048.0) = -9223372036854775808
    FE_INVALID was raised

• C23 standard (ISO/IEC 9899:2024):

• 7.12.9.4 The rint functions (p: TBD)

• 7.12.9.5 The lrint and llrint functions (p: TBD)

• 7.25 Type-generic math <tgmath.h> (p: TBD)

• F.10.6.4 The rint functions (p: TBD)

• F.10.6.5 The lrint and llrint functions (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.12.9.4 The rint functions (p: 184)

• 7.12.9.5 The lrint and llrint functions (p: 184)

• 7.25 Type-generic math <tgmath.h> (p: 272-273)

• F.10.6.4 The rint functions (p: 384)

• F.10.6.5 The lrint and llrint functions (p: 384)

• C11 standard (ISO/IEC 9899:2011):

• 7.12.9.4 The rint functions (p: 252)

• 7.12.9.5 The lrint and llrint functions (p: 252)

• 7.25 Type-generic math <tgmath.h> (p: 373-375)

• F.10.6.4 The rint functions (p: 527)

• F.10.6.5 The lrint and llrint functions (p: 527)

• C99 standard (ISO/IEC 9899:1999):

• 7.12.9.4 The rint functions (p: 232-233)

• 7.12.9.5 The lrint and llrint functions (p: 233)

• 7.22 Type-generic math <tgmath.h> (p: 335-337)

• F.9.6.4 The rint functions (p: 463)

• F.9.6.5 The lrint and llrint functions (p: 463)

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