题解 | #数值的整数次方#

class Solution {
  public:
    double Power(double base, int exponent) {
        if (abs(base)<=0.000000000001)return 0.0;
        if (exponent == 0) return 1.0;
        if (exponent == -1) return static_cast<double>(1)/base;
        if (exponent == 1) return base;
        
        double tmp = Power(base, exponent/2);

        if (exponent&1 )
        {
            return tmp*tmp*(exponent > 0? base : static_cast<double>(1)/base);
        }else {
            return tmp*tmp;
        }
        
    }
};