Pow(x,n).java

/*
mplement pow(x, n), which calculates x raised to the power n (xn).

Example 1:

Input: 2.00000, 10
Output: 1024.00000
Example 2:

Input: 2.10000, 3
Output: 9.26100
Example 3:

Input: 2.00000, -2
Output: 0.25000
Explanation: 2-2 = 1/22 = 1/4 = 0.25
Note:

-100.0 < x < 100.0
n is a 32-bit signed integer, within the range [−231, 231 − 1]
*/

class Solution {
    public double myPow(double x, int n) {
        
        if(n == 0){
            return 1.0;
        }
        
        if(n < 0){
           return (1/x) * myPow(1/x, ((-1) * n)-1); //negative minimum value if converted to positive it might overflow
        }
        else{
            if(n % 2 == 0){
                double temp = myPow(x,n/2);
                return temp * temp;
            }
            else{
                double temp = myPow(x,n/2);
                return x *  temp * temp;
            }
        }  
        
    }
}