1 class Solution {
 2 public:
 3     double Power(double base, int exponent) {
 4         int p = abs(exponent);
 5       double r = 1.0;
 6         while(p){
 7             if(p != 0) r *= base;
 8             p --;
 9         }
10         return exponent < 0 ? 1/ r : r;
11     }
12 };