C++ 代码

class Solution {
public:
    double Power(double b, int e) {
        double res=1.0;
        if(b==0)return 0;
        if(e==0)return 1;
            for(int i=1;i<=abs(e);i++)
            res*=b;
        return e>0?res:1.0/res;
    }
};