题解 | #数值的整数次方#

import java.util.*;
public class Solution {
    private double Pow(double x,int y){
        double res=1;
	  //快速幂
        while(y!=0){
            //y不是双数
            if((y&1)!=0){
                res*=x;
            }
            x*=x;
           y=y>>1;
        }
         return res;
    }
    public double Power(double base, int exponent) {
        if(exponent<0){
            base=1/base;
            exponent=-exponent;
        }
        return Pow(base,exponent);
  }
}