12_____数值的整数次方

public class Solution {
    //考虑三种情况 :
    //指数==0  
    //指数>0  
    //指数<0
    public double Power(double base, int exponent) {
        double res=1;
        if(exponent==0){
            return 1;
        }
        
        if(exponent>0){
            for(int i=1;i<=exponent;i++){
                res=res*base;
            }
        }else{
            exponent=-exponent;
            for(int i=1;i<=exponent;i++){
                res=res*base;
            }
            res=1/res;
        }
        return res;
  }
}