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/**

* BigInteger exercise.

*/

public class Pow {

/**

* Integer exponentiation.

*/

public static int pow(int x, int n) {

if (n == 0) return 1;

// find x to the n/2 recursively

int t = pow(x, n / 2);

// if n is even, the result is t squared

// if n is odd, the result is t squared times x

if (n % 2 == 0) {

return t * t;

} else {

return t * t * x;

}

}

}