pow(x,n).java

// Implement pow(x, n).

public class Solution {

    public double myPow(double x, int n) {
        
        if(n == 0) {
            
            return 1;
            
        }
        
        if(Double.isInfinite(x)) {
            
            return 0;
            
        }
        
        if(n < 0) {
            
            n = -n;
            x = 1 / x;

        }
        
        return n % 2 == 0 ? myPow(x * x, n / 2) : x * myPow(x * x, n / 2);
        
    }

}