`long lround(double __x)`

The lround() function rounds *__x* to the
nearest integer, but rounds halfway cases away from zero (instead of to the nearest even
integer). This function is similar to round() function, but it differs in type of return value and in that an
overflow is possible.

Remember:

The rounded long integer value. If *__x* is not a finite
number or an overflow was, this realization returns the
`LONG_MIN`

value (0x80000000).