class Solution {
public:
double Power(double base, int exponent) {
while(base!=0){
if(exponent==0){
return 1;
}
if(exponent==1){
return base;
}
double a=base;
if(exponent>0){
for (int i=2;i<=exponent;i++){
a=base;
}
return a;
}
else {
for (int i=2;i<=-exponent;i++){
a=base;
}
return 1/a;
} } return 0; }
};