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Showing content from https://cplusplus.com/reference/cmath/llround/ below:

function

llround

long long int llround  (double x);long long int llroundf (float x);long long int llroundl (long double x);

long long int llround (double x);long long int llround (float x);long long int llround (long double x);long long int llround (T x);           // additional overloads for integral types

Round to nearest and cast to long long integer

Returns the integer value that is nearest in value to x, with halfway cases rounded away from zero.

The rounded value is returned as a value of type long long int. See lround for an equivalent function that returns a long int instead.

Header

<tgmath.h>

provides a type-generic macro version of this function.

Additional overloads

are provided in this header (

<cmath>

) for the

integral types

: These overloads effectively cast

to a

double

before calculations (defined for

being any

integral type

Parameters

x: Value to round.

Return Value The value of x rounded to the nearest integral, casted to a value of type long long int.
If the rounded value is outside the range of the return type, the value returned is unspecified, and a domain error or an overflow range error may occur (or none, depending on implementation).

If a domain error occurs:

- And math_errhandling has MATH_ERRNO set: the global variable errno is set to EDOM.
- And math_errhandling has MATH_ERREXCEPT set: FE_INVALID is raised.

If an overflow range error occurs:

- And math_errhandling has MATH_ERRNO set: the global variable errno is set to ERANGE.
- And math_errhandling has MATH_ERREXCEPT set: FE_OVERFLOW is raised.

Example

/* llround example */
#include <stdio.h>      /* printf */
#include <math.h>       /* lround */

int main ()
{
  printf ( "llround (2.3) = %lld\n", llround(2.3) );
  printf ( "llround (3.8) = %lld\n", llround(3.8) );
  printf ( "llround (-2.3) = %lld\n", llround(-2.3) );
  printf ( "llround (-3.8) = %lld\n", llround(-3.8) );
  return 0;
}

Possible output:

Rounding using to-nearest rounding:
llround (2.3) = 2
llround (3.8) = 4
llround (-2.3) = -2
llround (-3.8) = -4