class Solution {
public:
double Power(double base, int exponent) {
if (exponent == 0) return 1;
double res = 1;
int k = 0;
if (exponent < 0){
k = exponent*(-1);
}
else{
k = exponent;
}
for(int i = 0; i < k; i++){
res = res * base;
}
if (exponent < 0){
return 1.0/res;
}
return res;
}
};