题解 | 数值的整数次方

class Solution {
private:
    double multiplay(double x, int n){
        if(n == 0) return 1;
        double tmp = multiplay(x, n / 2);
        return n % 2 ? tmp * x * tmp : tmp * tmp;
    }
    
public:
    double Power(double base, int exponent) {
        
        return exponent >=0 ? multiplay(base,exponent):1 /multiplay(base, -exponent);
        
    }
};