• Clojure

(defn rnd [y] (int (+ y 0.5)))

• Ada

Y : constant Integer := Integer (Float'Rounding (X));

• C

int y = (int)floorf(x + 0.5f);

• C++

int y = static_cast<int>(std::floor(x + 0.5f));

• C#

long y = (long)Math.Round(x);

• D

int y = cast(int) x.round;

• Dart

var y = x.round();

• Elixir

y = Kernel.round x

• Fortran

integer :: y

y = nint(x)

• Go

y := int(math.Floor(x + 0.5))

• Haskell

y = floor (x + 1/2)

• JS

var y = Math.round(x);

• Java

NumberFormat f = getNumberInstance();
f.setRoundingMode(HALF_UP);
f.setMaximumFractionDigits(0);
int y = parseInt(f.format(x));

• Java

long y = Math.round(x);

• Lisp

(defun rnd (y) (floor (+ y 0.5)))

• Lua

function round(float)
    local int, part = math.modf(float)
    if float == math.abs(float) and part >= .5 then return int+1    -- positive float
    elseif part <= -.5 then return int-1                            -- negative float
    end
    return int
end

• Lua

function round(float)
    return math.floor(float + .5)
end

• PHP

$y = (int) round($x);

• Pascal

var
  y: integer;
  x: double;
begin
  y := round(x);
end.

• Perl

my $y = int($x + 1/2);

• Python

y = int(x + 0.5)

• Python

c = Context(rounding=ROUND_HALF_UP)
y = round(Decimal(x, c))

• Ruby

y = (x + 1/2r).floor

• Rust

let y = x.round() as i64;

• Scheme

(define y (round x))