• Java

BigInteger z = x.pow(n);

• C#

var z = BigInteger.Pow(x, n);

• D

BigInt z = x ^^ n;

• Dart

var z = pow(x, n);

• Elixir

z = :math.pow(x, n)

• Go

nb := big.NewInt(int64(n))
var z big.Int
z.Exp(x, nb, nil)

• Haskell

z = x ^ n

• JS

let z = x**n

• Pascal

  z := PowerN(x, n);

• Perl

my ($x, $y) = (3 ** 200, 25);
my $z = $x ** $y;

• Python

z = x**n

• Ruby

z = x ** n

• Rust

let z = num::pow(x, n);

• Smalltalk

z := x raisedTo: n.

• Smalltalk

z := x ** n.