题目描述
给定一个double类型的浮点数base和int类型的整数exponent。求base的exponent次方。

保证base和exponent不同时为0

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public class Solution {
  public double Power(double base, int exponent) {
  if(base == 0) return 0;
        long b = exponent;
        double res = 1.0;
        if(b < 0) {
            base = 1 / base;
            b = -b;
        }
        while(b > 0) {
            if((b & 1) == 1) res *= base;
            base *= base;
            b >>= 1;
        }
        return res;


  }
}